JavaScript實用功能代碼片斷

時間 2019-12-01

原文原文鏈接

1、原生JavaScript實現字符串長度截取



 1    function cutstr(str, len) {
 2         var temp;
 3         var icount = 0;
 4         var patrn = /[^\x00-\xff]/;
 5         var strre = "";
 6         for (var i = 0; i < str.length; i++) {
 7             if (icount < len - 1) {
 8                 temp = str.substr(i, 1);
 9                 if (patrn.exec(temp) == null) {
10                     icount = icount + 1
11                 } else {
12                     icount = icount + 2
13                 }
14                 strre += temp
15             } else {
16                 break
17             }
18         }
19         return strre + "..."
20     }

 

2、原生JavaScript獲取域名主機



 1     function getHost(url) {
 2         var host = "null";
 3         if(typeof url == "undefined"|| null == url) {
 4             url = window.location.href;
 5         }
 6         var regex = /^\w+\:\/\/([^\/]*).*/;
 7         var match = url.match(regex);
 8         if(typeof match != "undefined" && null != match) {
 9             host = match[1];
10         }
11         return host;
12 }

 

3、原生JavaScript清除空格


1   String.prototype.trim = function() {
2         var reExtraSpace = /^\s*(.*?)\s+$/;
3         return this.replace(reExtraSpace, "$1")
4     }

4、原生JavaScript替換所有


1     String.prototype.replaceAll = function(s1, s2) {
2         return this.replace(new RegExp(s1, "gm"), s2)
3     }

5、原生JavaScript轉義html標籤


1 function HtmlEncode(text) {
2         return text.replace(/&/g, '&amp').replace(/\"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
3     }
 
6、原生JavaScript還原html標籤


1 function HtmlDecode(text) {
2         return text.replace(/&amp;/g, '&').replace(/&quot;/g, '\"').replace(/&lt;/g, '<').replace(/&gt;/g, '>')
3     }
 
7、原生JavaScript時間日期格式轉換



 1     Date.prototype.Format = function(formatStr) {
 2         var str = formatStr;
 3         var Week = ['日', '一', '二', '三', '四', '五', '六'];
 4         str = str.replace(/yyyy|YYYY/, this.getFullYear());
 5         str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100));
 6         str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1));
 7         str = str.replace(/M/g, (this.getMonth() + 1));
 8         str = str.replace(/w|W/g, Week[this.getDay()]);
 9         str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());
10         str = str.replace(/d|D/g, this.getDate());
11         str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());
12         str = str.replace(/h|H/g, this.getHours());
13         str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());
14         str = str.replace(/m/g, this.getMinutes());
15         str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());
16         str = str.replace(/s|S/g, this.getSeconds());
17         return str
18     }


8、原生JavaScript判斷是否爲數字類型



1 function isDigit(value) {
2         var patrn = /^[0-9]*$/;
3         if (patrn.exec(value) == null || value == "") {
4             return false
5         } else {
6             return true
7         }
8     }


9、原生JavaScript設置cookie值



1 function setCookie(name, value, Hours) {
2             var d = new Date();
3         var offset = 8;
4         var utc = d.getTime() + (d.getTimezoneOffset() * 60000);
5         var nd = utc + (3600000 * offset);
6         var exp = new Date(nd);
7         exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);
8         document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;"
9     }


10、原生JavaScript獲取cookie值


1     function getCookie(name) {
2         var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
3         if (arr != null) return unescape(arr[2]);
4         return null
5     }

11、原生JavaScript加入收藏夾



 1 function AddFavorite(sURL, sTitle) {
 2         try {
 3             window.external.addFavorite(sURL, sTitle)
 4         } catch(e) {
 5             try {
 6                 window.sidebar.addPanel(sTitle, sURL, "")
 7             } catch(e) {
 8                 alert("加入收藏失敗，請使用Ctrl+D進行添加")
 9             }
10         }
11     }

 
12、原生JavaScript設爲首頁



 1 function setHomepage() {
 2         if (document.all) {
 3             document.body.style.behavior = 'url(#default#homepage)';
 4             document.body.setHomePage('http://www.jqueryschool')    //http:jq-school.com/ 5         } else if (window.sidebar) {
 6             if (window.netscape) {
 7                 try {
 8                     netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect")
 9                 } catch(e) {
10                     alert("該操做被瀏覽器拒絕，若是想啓用該功能，請在地址欄內輸入 about:config,而後將項 signed.applets.codebase_principal_support 值該爲true")
11                 }
12             }
13             var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
14             prefs.setCharPref('browser.startup.homepage', 'http://www.jqueryschool')     //http:jq-school.com/
15 } 
16 }



 
13、原生JavaScript判斷IE6



1 var ua = navigator.userAgent.toLowerCase();
2     var isIE6 = ua.indexOf("msie 6") > -1;
3     if (isIE6) {
4         try {
5             document.execCommand("BackgroundImageCache", false, true)
6         } catch(e) {}
7     }

 
14、原生JavaScript加載樣式文件



 1 function LoadStyle(url) {
 2         try {
 3             document.createStyleSheet(url)
 4         } catch(e) {
 5             var cssLink = document.createElement('link');
 6             cssLink.rel = 'stylesheet';
 7             cssLink.type = 'text/css';
 8             cssLink.href = url;
 9             var head = document.getElementsByTagName('head')[0];
10             head.appendChild(cssLink)
11         }
12     }

 

15、原生JavaScript返回腳本內容



 1 function evalscript(s) {
 2         if(s.indexOf('<script') == -1) return s;
 3         var p = /<script[^\>]*?>([^\x00]*?)<\/script>/ig;
 4         var arr = [];
 5         while(arr = p.exec(s)) {
 6             var p1 = /<script[^\>]*?src=\"([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i;
 7             var arr1 = [];
 8             arr1 = p1.exec(arr[0]);
 9             if(arr1) {
10                 appendscript(arr1[1], '', arr1[2], arr1[3]);
11             } else {
12                 p1 = /<script(.*?)>([^\x00]+?)<\/script>/i;
13                 arr1 = p1.exec(arr[0]);
14                 appendscript('', arr1[2], arr1[1].indexOf('reload=') != -1);
15             }
16         }
17         return s;
18     }

 

16、原生JavaScript清除腳本內容


1 function stripscript(s) {
2         return s.replace(/<script.*?>.*?<\/script>/ig, '');
3     }
 

17、原生JavaScript動態加載腳本文件



 1 function appendscript(src, text, reload, charset) {
 2         var id = hash(src + text);
 3         if(!reload && in_array(id, evalscripts)) return;
 4         if(reload && $(id)) {
 5             $(id).parentNode.removeChild($(id));
 6         }
 7      
 8         evalscripts.push(id);
 9         var scriptNode = document.createElement("script");
10         scriptNode.type = "text/javascript";
11         scriptNode.id = id;
12         scriptNode.charset = charset ? charset : (BROWSER.firefox ? document.characterSet : document.charset);
13         try {
14             if(src) {
15                 scriptNode.src = src;
16                 scriptNode.onloadDone = false;
17                 scriptNode.onload = function () {
18                     scriptNode.onloadDone = true;
19                     JSLOADED[src] = 1;
20                 };
21                 scriptNode.onreadystatechange = function () {
22                     if((scriptNode.readyState == 'loaded' || scriptNode.readyState == 'complete') && !scriptNode.onloadDone) {
23                         scriptNode.onloadDone = true;
24                         JSLOADED[src] = 1;
25                     }
26                 };
27             } else if(text){
28                 scriptNode.text = text;
29             }
30             document.getElementsByTagName('head')[0].appendChild(scriptNode);
31         } catch(e) {}
32     }

 

18、原生JavaScript返回按ID檢索的元素對象


1 function $(id) {
2         return !id ? null : document.getElementById(id);
3     }
 

19、原生JavaScript返回瀏覽器版本內容



 1 function browserVersion(types) {
 2         var other = 1;
 3         for(i in types) {
 4             var v = types[i] ? types[i] : i;
 5             if(USERAGENT.indexOf(v) != -1) {
 6                 var re = new RegExp(v + '(\\/|\\s)([\\d\\.]+)', 'ig');
 7                 var matches = re.exec(USERAGENT);
 8                 var ver = matches != null ? matches[2] : 0;
 9                 other = ver !== 0 && v != 'mozilla' ? 0 : other;
10             }else {
11                 var ver = 0;
12             }
13             eval('BROWSER.' + i + '= ver');
14         }
15         BROWSER.other = other;
16     }

 

20、原生JavaScript元素顯示的通用方法



 1 function $(id) {
 2         return !id ? null : document.getElementById(id);
 3     }
 4     function display(id) {
 5         var obj = $(id);
 6         if(obj.style.visibility) {
 7             obj.style.visibility = obj.style.visibility == 'visible' ? 'hidden' : 'visible';
 8         } else {
 9             obj.style.display = obj.style.display == '' ? 'none' : '';
10         }
11     }

 

2一、原生JavaScript中有insertBefore方法,惋惜卻沒有insertAfter方法?用以下函數實現



1 function insertAfter(newChild,refChild){ 
2     var parElem=refChild.parentNode; 
3     if(parElem.lastChild==refChild){ 
4         refChild.appendChild(newChild); 
5     }else{ 
6         parElem.insertBefore(newChild,refChild.nextSibling); 
7     } 
8 }

 

22、原生JavaScript中兼容瀏覽器綁定元素事件



1 function addEventSamp(obj,evt,fn){ 
2     if (obj.addEventListener) { 
3         obj.addEventListener(evt, fn, false); 
4     }else if(obj.attachEvent){ 
5         obj.attachEvent('on'+evt,fn); 
6     } 
7 } 

 

23、原生JavaScript光標停在文字的後面，文本框得到焦點時調用



1 function focusLast(){ 
2     var e = event.srcElement; 
3     var r =e.createTextRange(); 
4     r.moveStart('character',e.value.length); 
5     r.collapse(true); 
6     r.select(); 
7 }

 

24、原生JavaScript檢驗URL連接是否有效



 1 function getUrlState(URL){ 
 2     var xmlhttp = new ActiveXObject("microsoft.xmlhttp"); 
 3     xmlhttp.Open("GET",URL, false);  
 4     try{  
 5         xmlhttp.Send(); 
 6     }catch(e){
 7     }finally{ 
 8         var result = xmlhttp.responseText; 
 9         if(result){ 
10             if(xmlhttp.Status==200){ 
11                 return(true); 
12             }else{ 
13                 return(false); 
14             } 
15         }else{ 
16             return(false); 
17         } 
18     } 
19 }

 

25、原生JavaScript格式化CSS樣式代碼



1 function formatCss(s){//格式化代碼
2     s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");
3     s = s.replace(/;\s*;/g, ";"); //清除連續分號
4     s = s.replace(/\,[\s\.\#\d]*{/g, "{");
5     s = s.replace(/([^\s])\{([^\s])/g, "$1 {\n\t$2");
6     s = s.replace(/([^\s])\}([^\n]*)/g, "$1\n}\n$2");
7     s = s.replace(/([^\s]);([^\s\}])/g, "$1;\n\t$2");
8     return s;
9 }

 

26、原生JavaScript壓縮CSS樣式代碼



1 function yasuoCss (s) {//壓縮代碼
2     s = s.replace(/\/\*(.|\n)*?\*\//g, ""); //刪除註釋
3     s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");
4     s = s.replace(/\,[\s\.\#\d]*\{/g, "{"); //容錯處理
5     s = s.replace(/;\s*;/g, ";"); //清除連續分號
6     s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白
7     return (s == null) ? "" : s[1];
8 }

 

27、原生JavaScript獲取當前路徑



1 var currentPageUrl = "";
2 if (typeof this.href === "undefined") {
3     currentPageUrl = document.location.toString().toLowerCase();
4 }
5 else {
6     currentPageUrl = this.href.toString().toLowerCase();
7 }

 

28、原生JavaScriptIP轉成整型



1 function _ip2int(ip){
2     var num = 0;
3     ip = ip.split(".");
4     num = Number(ip[0]) * 256 * 256 * 256 + Number(ip[1]) * 256 * 256 + Number(ip[2]) * 256 + Number(ip[3]);
5     num = num >>> 0;
6     return num;
7 }

 

29、原生JavaScript整型解析爲IP地址



 1 function _int2iP(num){
 2     var str;
 3     var tt = new Array();
 4     tt[0] = (num >>> 24) >>> 0;
 5     tt[1] = ((num << 8) >>> 24) >>> 0;
 6     tt[2] = (num << 16) >>> 24;
 7     tt[3] = (num << 24) >>> 24;
 8     str = String(tt[0]) + "." + String(tt[1]) + "." + String(tt[2]) + "." + String(tt[3]);
 9     return str;
10 }

 

30、原生JavaScript實現checkbox全選與全不選



 1 function checkAll() {
 2     var selectall = document.getElementById("selectall");
 3     var allbox = document.getElementsByName("allbox");
 4     if (selectall.checked) {
 5         for (var i = 0; i < allbox.length; i++) {
 6             allbox[i].checked = true;
 7         }
 8     } else {
 9         for (var i = 0; i < allbox.length; i++) {
10             allbox[i].checked = false;
11         }
12     }
13 }

31、原生JavaScript判斷是否移動設備



 1 function isMobile(){
 2     if (typeof this._isMobile === 'boolean'){
 3         return this._isMobile;
 4     }
 5     var screenWidth = this.getScreenWidth();
 6     var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;
 7     var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");
 8     if(!fixViewPortsExperiment){
 9         if(!this.isAppleMobileDevice()){
10             screenWidth = screenWidth/window.devicePixelRatio;
11         }
12     }
13     var isMobileScreenSize = screenWidth < 600;
14     var isMobileUserAgent = false;
15     this._isMobile = isMobileScreenSize && this.isTouchScreen();
16     return this._isMobile;
17 }

 

32、原生JavaScript判斷是否移動設備訪問


1 function isMobileUserAgent(){
2     return (/iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(window.navigator.userAgent.toLowerCase()));
3 }
 

33、原生JavaScript判斷是否蘋果移動設備訪問


1 function isAppleMobileDevice(){
2     return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase()));
3 }
 

34、原生JavaScript判斷是否安卓移動設備訪問


1 function isAndroidMobileDevice(){
2     return (/android/i.test(navigator.userAgent.toLowerCase()));
3 }
 
35、原生JavaScript判斷是否Touch屏幕


1 function isTouchScreen(){
2     return (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch);
3 }
 

36、原生JavaScript判斷是否在安卓上的谷歌瀏覽器



 1 function isNewChromeOnAndroid(){
 2     if(this.isAndroidMobileDevice()){
 3         var userAgent = navigator.userAgent.toLowerCase();
 4         if((/chrome/i.test(userAgent))){
 5             var parts = userAgent.split('chrome/');
 6 
 7             var fullVersionString = parts[1].split(" ")[0];
 8             var versionString = fullVersionString.split('.')[0];
 9             var version = parseInt(versionString);
10 
11             if(version >= 27){
12                 return true;
13             }
14         }
15     }
16     return false;
17 }

 
37、原生JavaScript判斷是否打開視窗


1 function isViewportOpen() {
2     return !!document.getElementById('wixMobileViewport');
3 }
 


38、原生JavaScript獲取移動設備初始化大小



 1 function getInitZoom(){
 2     if(!this._initZoom){
 3         var screenWidth = Math.min(screen.height, screen.width);
 4         if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){
 5             screenWidth = screenWidth/window.devicePixelRatio;
 6         }
 7         this._initZoom = screenWidth /document.body.offsetWidth;
 8     }
 9     return this._initZoom;
10 }

 


39、原生JavaScript獲取移動設備最大化大小



 1 function getZoom(){
 2     var screenWidth = (Math.abs(window.orientation) === 90) ? Math.max(screen.height, screen.width) : Math.min(screen.height, screen.width);
 3     if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){
 4         screenWidth = screenWidth/window.devicePixelRatio;
 5     }
 6     var FixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;
 7     var FixViewPortsExperimentRunning = FixViewPortsExperiment && (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new");
 8     if(FixViewPortsExperimentRunning){
 9         return screenWidth / window.innerWidth;
10     }else{
11         return screenWidth / document.body.offsetWidth;
12     }
13 }

 


40、原生JavaScript獲取移動設備屏幕寬度



 1 function getScreenWidth(){
 2     var smallerSide = Math.min(screen.width, screen.height);
 3     var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;
 4     var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");
 5     if(fixViewPortsExperiment){
 6         if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){
 7             smallerSide = smallerSide/window.devicePixelRatio;
 8         }
 9     }
10     return smallerSide;
11 }

 


41、原生JavaScript完美判斷是否爲網址



1 function IsURL(strUrl) {
2     var regular = /^\b(((https?|ftp):\/\/)?[-a-z0-9]+(\.[-a-z0-9]+)*\.(?:com|edu|gov|int|mil|net|org|biz|info|name|museum|asia|coop|aero|[a-z][a-z]|((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]\d)|\d))\b(\/[-a-z0-9_:\@&?=+,.!\/~%\$]*)?)$/i
3     if (regular.test(strUrl)) {
4         return true;
5     }
6     else {
7         return false;
8     }
9 }

 


42、原生JavaScript根據樣式名稱檢索元素對象



 1 function getElementsByClassName(name) {
 2     var tags = document.getElementsByTagName('*') || document.all;
 3     var els = [];
 4     for (var i = 0; i < tags.length; i++) {
 5         if (tags[i].className) {
 6             var cs = tags[i].className.split(' ');
 7             for (var j = 0; j < cs.length; j++) {
 8                 if (name == cs[j]) {
 9                     els.push(tags[i]);
10                     break
11                 }
12             }
13         }
14     }
15     return els
16 }

 

43、原生JavaScript判斷是否以某個字符串開頭


1 String.prototype.startWith = function (s) {
2     return this.indexOf(s) == 0
3 }
 
44、原生JavaScript判斷是否以某個字符串結束


1 String.prototype.endWith = function (s) {
2     var d = this.length - s.length;
3     return (d >= 0 && this.lastIndexOf(s) == d)
4 }
 


45、原生JavaScript返回IE瀏覽器的版本號



1 function getIE(){
2     if (window.ActiveXObject){
3         var v = navigator.userAgent.match(/MSIE ([^;]+)/)[1];
4         return parseFloat(v.substring(0, v.indexOf(".")))
5     }
6     return false
7 }

 


46、原生JavaScript獲取頁面高度


1 function getPageHeight(){
2     var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat"
3             ? a
4             : g.documentElement;
5     return Math.max(f.scrollHeight, a.scrollHeight, d.clientHeight);
6 }
 


47、原生JavaScript獲取頁面scrollLeft


1 function getPageScrollLeft(){
2     var a = document;
3     return a.documentElement.scrollLeft || a.body.scrollLeft;
4 }
 


48、原生JavaScript獲取頁面可視寬度


1 function getPageViewWidth(){
2     var d = document, a = d.compatMode == "BackCompat"
3             ? d.body
4             : d.documentElement;
5     return a.clientWidth;
6 }
 


49、原生JavaScript獲取頁面寬度


1 function getPageWidth(){
2     var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat"
3             ? a
4             : g.documentElement;
5     return Math.max(f.scrollWidth, a.scrollWidth, d.clientWidth);
6 }
 


50、原生JavaScript獲取頁面scrollTop


1 function getPageScrollTop(){
2     var a = document;
3     return a.documentElement.scrollTop || a.body.scrollTop;
4 }
 


51、原生JavaScript獲取頁面可視高度


1 function getPageViewHeight() {
2     var d = document, a = d.compatMode == "BackCompat"
3             ? d.body
4             : d.documentElement;
5     return a.clientHeight;
6 }
 


52、原生JavaScript跨瀏覽器添加事件



 1 function addEvt(oTarget,sEvtType,fnHandle){
 2     if(!oTarget){return;}
 3     if(oTarget.addEventListener){
 4         oTarget.addEventListener(sEvtType,fnHandle,false);
 5     }else if(oTarget.attachEvent){
 6         oTarget.attachEvent("on" + sEvtType,fnHandle);
 7     }else{
 8         oTarget["on" + sEvtType] = fnHandle;
 9     }
10 }

 


53、原生JavaScript跨瀏覽器刪除事件



 1 function delEvt(oTarget,sEvtType,fnHandle){
 2     if(!oTarget){return;}
 3     if(oTarget.addEventListener){
 4         oTarget.addEventListener(sEvtType,fnHandle,false);
 5     }else if(oTarget.attachEvent){
 6         oTarget.attachEvent("on" + sEvtType,fnHandle);
 7     }else{
 8         oTarget["on" + sEvtType] = fnHandle;
 9     }
10 }

 


54、原生JavaScript去掉url前綴



1 function removeUrlPrefix(a){
2   a=a.replace(/：/g,":").replace(/．/g,".").replace(/／/g,"/");
3   while(trim(a).toLowerCase().indexOf("http://")==0){
4     a=trim(a.replace(/http:\/\//i,""));
5   }
6   return a;
7 }

 


55、原生JavaScript隨機數時間戳


1 function uniqueId(){
2     var a=Math.random,b=parseInt;
3     return Number(new Date()).toString()+b(10*a())+b(10*a())+b(10*a());
4 }
 


56、原生JavaScript全角半角轉換,iCase: 0全到半，1半到全，其餘不轉化



 1 function chgCase(sStr,iCase){
 2     if(typeof sStr != "string" || sStr.length <= 0 || !(iCase === 0 || iCase == 1)){
 3         return sStr;
 4     }
 5     var i,oRs=[],iCode;
 6     if(iCase){/*半->全*/
 7         for(i=0; i<sStr.length;i+=1){ 
 8             iCode = sStr.charCodeAt(i);
 9             if(iCode == 32){
10                 iCode = 12288;                
11             }else if(iCode < 127){
12                 iCode += 65248;
13             }
14             oRs.push(String.fromCharCode(iCode)); 
15         }        
16     }else{/*全->半*/
17         for(i=0; i<sStr.length;i+=1){ 
18             iCode = sStr.charCodeAt(i);
19             if(iCode == 12288){
20                 iCode = 32;
21             }else if(iCode > 65280 && iCode < 65375){
22                 iCode -= 65248;                
23             }
24             oRs.push(String.fromCharCode(iCode)); 
25         }        
26     }        
27     return oRs.join("");        
28 }

 


57、原生JavaScript確認是否鍵盤有效輸入值



 1 function checkKey(iKey){
 2     if(iKey == 32 || iKey == 229){return true;}/*空格和異常*/
 3     if(iKey>47 && iKey < 58){return true;}/*數字*/
 4     if(iKey>64 && iKey < 91){return true;}/*字母*/
 5     if(iKey>95 && iKey < 108){return true;}/*數字鍵盤1*/
 6     if(iKey>108 && iKey < 112){return true;}/*數字鍵盤2*/
 7     if(iKey>185 && iKey < 193){return true;}/*符號1*/
 8     if(iKey>218 && iKey < 223){return true;}/*符號2*/
 9     return false;
10 }

 


58、原生JavaScript獲取網頁被捲去的位置



1 function getScrollXY() {
2     return document.body.scrollTop ? {
3         x: document.body.scrollLeft,
4         y: document.body.scrollTop
5     }: {
6         x: document.documentElement.scrollLeft,
7         y: document.documentElement.scrollTop
8     }
9 }

 


5九、原生JavaScript另外一種正則日期格式化函數+調用方法



 1 Date.prototype.format = function(format){ //author: meizz
 2   var o = {
 3     "M+" : this.getMonth()+1, //month
 4     "d+" : this.getDate(),    //day
 5     "h+" : this.getHours(),   //hour
 6     "m+" : this.getMinutes(), //minute
 7     "s+" : this.getSeconds(), //second
 8     "q+" : Math.floor((this.getMonth()+3)/3),  //quarter
 9     "S" : this.getMilliseconds() //millisecond
10   }
11   if(/(y+)/.test(format)) format=format.replace(RegExp.$1,
12     (this.getFullYear()+"").substr(4 - RegExp.$1.length));
13   for(var k in o)if(new RegExp("("+ k +")").test(format))
14     format = format.replace(RegExp.$1,
15       RegExp.$1.length==1 ? o[k] :
16         ("00"+ o[k]).substr((""+ o[k]).length));
17   return format;
18 }
19 alert(new Date().format("yyyy-MM-dd hh:mm:ss"));

 


60、原生JavaScript時間個性化輸出功能



 1 /*
 2 一、< 60s, 顯示爲「剛剛」
 3 二、>= 1min && < 60 min, 顯示與當前時間差「XX分鐘前」
 4 三、>= 60min && < 1day, 顯示與當前時間差「今天 XX:XX」
 5 四、>= 1day && < 1year, 顯示日期「XX月XX日 XX:XX」
 6 五、>= 1year, 顯示具體日期「XXXX年XX月XX日 XX:XX」
 7  */
 8 function timeFormat(time){
 9   var date = new Date(time)
10     , curDate = new Date()
11     , year = date.getFullYear()
12     , month = date.getMonth() + 1
13     , day = date.getDate()
14     , hour = date.getHours()
15     , minute = date.getMinutes()
16     , curYear = curDate.getFullYear()
17     , curHour = curDate.getHours()
18     , timeStr;
19 
20   if(year < curYear){
21     timeStr = year +'年'+ month +'月'+ day +'日 '+ hour +':'+ minute;
22   }else{
23     var pastTime = curDate - date
24       , pastH = pastTime/3600000;
25 
26     if(pastH > curHour){
27       timeStr = month +'月'+ day +'日 '+ hour +':'+ minute;
28     }else if(pastH >= 1){
29       timeStr = '今天 ' + hour +':'+ minute +'分';
30     }else{
31       var pastM = curDate.getMinutes() - minute;
32       if(pastM > 1){
33         timeStr = pastM +'分鐘前';
34       }else{
35         timeStr = '剛剛';
36       }
37     }
38   }
39   return timeStr;
40 }

 


61、原生JavaScript解決offsetX兼容性問題



 1 // 針對火狐不支持offsetX/Y
 2 function getOffset(e){
 3   var target = e.target, // 當前觸發的目標對象
 4       eventCoord,
 5       pageCoord,
 6       offsetCoord;
 7 
 8   // 計算當前觸發元素到文檔的距離
 9   pageCoord = getPageCoord(target);
10 
11   // 計算光標到文檔的距離
12   eventCoord = {
13     X : window.pageXOffset + e.clientX,
14     Y : window.pageYOffset + e.clientY
15   };
16 
17   // 相減獲取光標到第一個定位的父元素的座標
18   offsetCoord = {
19     X : eventCoord.X - pageCoord.X,
20     Y : eventCoord.Y - pageCoord.Y
21   };
22   return offsetCoord;
23 }
24 
25 function getPageCoord(element){
26   var coord = { X : 0, Y : 0 };
27   // 計算從當前觸發元素到根節點爲止，
28   // 各級 offsetParent 元素的 offsetLeft 或 offsetTop 值之和
29   while (element){
30     coord.X += element.offsetLeft;
31     coord.Y += element.offsetTop;
32     element = element.offsetParent;
33   }
34   return coord;
35 }

 


62、原生JavaScript經常使用的正則表達式



 1 //正整數
 2 /^[0-9]*[1-9][0-9]*$/;
 3 //負整數
 4 /^-[0-9]*[1-9][0-9]*$/;
 5 //正浮點數
 6 /^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$/;   
 7 //負浮點數
 8 /^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$/;  
 9 //浮點數
10 /^(-?\d+)(\.\d+)?$/;
11 //email地址
12 /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/;
13 //url地址
14 /^[a-zA-z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\S*)?$/;
15 //年/月/日（年-月-日、年.月.日）
16 /^(19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])$/;
17 //匹配中文字符
18 /[\u4e00-\u9fa5]/;
19 //匹配賬號是否合法(字母開頭，容許5-10字節，容許字母數字下劃線)
20 /^[a-zA-Z][a-zA-Z0-9_]{4,9}$/;
21 //匹配空白行的正則表達式
22 /\n\s*\r/;
23 //匹配中國郵政編碼
24 /[1-9]\d{5}(?!\d)/;
25 //匹配身份證
26 /\d{15}|\d{18}/;
27 //匹配國內電話號碼
28 /(\d{3}-|\d{4}-)?(\d{8}|\d{7})?/;
29 //匹配IP地址
30 /((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)/;
31 //匹配首尾空白字符的正則表達式
32 /^\s*|\s*$/;
33 //匹配HTML標記的正則表達式
34 < (\S*?)[^>]*>.*?|< .*? />;

 


63、原生JavaScript實現返回頂部的通用方法



 1 function backTop(btnId) {
 2     var btn = document.getElementById(btnId);
 3     var d = document.documentElement;
 4     var b = document.body;
 5     window.onscroll = set;
 6     btn.style.display = "none";
 7     btn.onclick = function() {
 8         btn.style.display = "none";
 9         window.onscroll = null;
10         this.timer = setInterval(function() {
11             d.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);
12             b.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);
13             if ((d.scrollTop + b.scrollTop) == 0) clearInterval(btn.timer, window.onscroll = set);
14         },
15         10);
16     };
17     function set() {
18         btn.style.display = (d.scrollTop + b.scrollTop > 100) ? 'block': "none"
19     }
20 };
21 backTop('goTop');

 


64、原生JavaScript得到URL中GET參數值



 1 // 用法：若是地址是 test.htm?t1=1&t2=2&t3=3, 那麼能取得：GET["t1"], GET["t2"], GET["t3"]
 2 function get_get(){ 
 3   querystr = window.location.href.split("?")
 4   if(querystr[1]){
 5     GETs = querystr[1].split("&")
 6     GET =new Array()
 7     for(i=0;i<GETs.length;i++){
 8       tmp_arr = GETs[i].split("=")
 9       key=tmp_arr[0]
10       GET[key] = tmp_arr[1]
11     }
12   }
13   return querystr[1];
14 }

 


65、原生JavaScript實現全選通用方法



1 function checkall(form, prefix, checkall) {
2     var checkall = checkall ? checkall : 'chkall';
3     for(var i = 0; i < form.elements.length; i++) {
4         var e = form.elements[i];
5         if(e.type=="checkbox"){
6             e.checked = form.elements[checkall].checked;
7         }
8     }
9 }

 


66、原生JavaScript實現所有取消選擇通用方法



1 function uncheckAll(form) {
2     for (var i=0;i<form.elements.length;i++){
3         var e = form.elements[i];
4         if (e.name != 'chkall')
5         e.checked=!e.checked;
6     }
7 }

 


67、原生JavaScript實現打開一個窗體通用方法



 1 function openWindow(url,windowName,width,height){
 2     var x = parseInt(screen.width / 2.0) - (width / 2.0); 
 3     var y = parseInt(screen.height / 2.0) - (height / 2.0);
 4     var isMSIE= (navigator.appName == "Microsoft Internet Explorer");
 5     if (isMSIE) {
 6         var p = "resizable=1,location=no,scrollbars=no,width=";
 7         p = p+width;
 8         p = p+",height=";
 9         p = p+height;
10         p = p+",left=";
11         p = p+x;
12         p = p+",top=";
13         p = p+y;
14         retval = window.open(url, windowName, p);
15     } else {
16         var win = window.open(url, "ZyiisPopup", "top=" + y + ",left=" + x + ",scrollbars=" + scrollbars + ",dialog=yes,modal=yes,width=" + width + ",height=" + height + ",resizable=no" );
17         eval("try { win.resizeTo(width, height); } catch(e) { }");
18         win.focus();
19     }
20 }

 


68、原生JavaScript判斷是否爲客戶端設備



 1 function client(o){    
 2        var b = navigator.userAgent.toLowerCase();   
 3        var t = false;
 4        if (o == 'isOP'){
 5              t = b.indexOf('opera') > -1;
 6        }
 7        if (o == 'isIE'){
 8              t = b.indexOf('msie') > -1;
 9        }
10        if (o == 'isFF'){
11              t = b.indexOf('firefox') > -1;
12        }
13        return t;
14 }

 


69、原生JavaScript獲取單選按鈕的值



 1 function get_radio_value(field){
 2     if(field&&field.length){    
 3         for(var i=0;i<field.length;i++){        
 4             if(field[i].checked){            
 5                 return field[i].value;                                
 6             }            
 7         }        
 8     }else {        
 9         return ;                
10     }    
11 }

 


70、原生JavaScript獲取複選框的值



 1 function get_checkbox_value(field){    
 2     if(field&&field.length){    
 3         for(var i=0;i<field.length;i++){            
 4             if(field[i].checked && !field[i].disabled){
 5                 return field[i].value;
 6             }
 7         }        
 8     }else {
 9         return;
10     }            
11 }



71、原生JavaScript判斷是否爲郵箱



1 function isEmail(str){
2     var re=/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/; 
3     if (re.test(str) != true) {
4         return false;
5     }else{
6         return true;
7     }    
8 }

 


72、原生JavaScript判斷是否有列表中的危險字符



1 function isValidReg(chars){
2     var re=/<|>|\[|\]|\{|\}|『|』|※|○|●|◎|§|△|▲|☆|★|◇|◆|□|▼|㊣|﹋|⊕|⊙|〒|ㄅ|ㄆ|ㄇ|ㄈ|ㄉ|ㄊ|ㄋ|ㄌ|ㄍ|ㄎ|ㄏ|ㄐ|ㄑ|ㄒ|ㄓ|ㄔ|ㄕ|ㄖ|ㄗ|ㄘ|ㄙ|ㄚ|ㄛ|ㄜ|ㄝ|ㄞ|ㄟ|ㄢ|ㄣ|ㄤ|ㄥ|ㄦ|ㄧ|ㄨ|ㄩ|■|▄|▆|\*|@|#|\^|\\/;
3     if (re.test( chars) == true) {
4         return false;
5     }else{
6         return true;
7     }    
8 }

 


73、原生JavaScript判斷字符串是否大於規定的長度


1 function isValidLength(chars, len) {
2     if (chars.length < len) {
3         return false;
4     }
5     return true;
6 }
 


74、原生JavaScript判斷字符串是爲網址不區分大小寫



 1 function isValidURL( chars ) {
 2     var re=/^([hH][tT]{2}[pP]:\/\/|[hH][tT]{2}[pP][sS]:\/\/)(\S+\.\S+)$/;
 3     if (!isNULL(chars)) {
 4         chars = jsTrim(chars);
 5         if (chars.match(re) == null)
 6             return false;
 7         else
 8             return true;
 9     }
10     return false;
11 }

 


75、原生JavaScript判斷字符串是否爲小數



1 function isValidDecimal( chars ) {
2     var re=/^\d*\.?\d{1,2}$/;
3     if (chars.match(re) == null)
4         return false;
5     else
6         return true;
7 }

 


76、原生JavaScript判斷字符串是否爲整數



1 function isNumber( chars ) {
2     var re=/^\d*$/;
3     if (chars.match(re) == null)
4         return false;
5     else
6         return true;
7 }

 


77、原生JavaScript判斷字符串是否爲浮點數



1 function isFloat( str ) {
2     for(i=0;i<str.length;i++)  {
3        if ((str.charAt(i)<"0" || str.charAt(i)>"9")&& str.charAt(i) != '.'){
4             return false;
5        }
6     }
7     return true;
8 }

 


7八、原生JavaScript判斷字符是否爲A-Za-z英文字母



1 function isLetters( str ){
2     var re=/^[A-Za-z]+$/;
3     if (str.match(re) == null)
4         return false;
5     else
6         return true;
7 }

 


79、原生JavaScript判斷字符串是否郵政編碼



1 function isValidPost( chars ) {
2     var re=/^\d{6}$/;
3     if (chars.match(re) == null)
4         return false;
5     else
6         return true;
7 }

 


80、原生JavaScript判斷字符是否空NULL



1 function isNULL( chars ) {
2     if (chars == null)
3         return true;
4     if (jsTrim(chars).length==0)
5         return true;
6     return false;
7 }

 


81、原生JavaScript用正則表達式提取頁面代碼中全部網址


1 var aa = document.documentElement.outerHTML.match(/(url\(|src=|href=)[\"\']*([^\"\'\(\)\<\>\[\] ]+)[\"\'\)]*|(http:\/\/[\w\-\.]+[^\"\'\(\)\<\>\[\] ]+)/ig).join("\r\n").replace(/^(src=|href=|url\()[\"\']*|[\"\'\>\) ]*$/igm,"");
2 alert(aa)
 


82、原生JavaScript用正則表達式清除相同的數組(低效率)


1 Array.prototype.unique=function(){
2     return this.reverse().join(",").match(/([^,]+)(?!.*\1)/ig).reverse();
3 }
 


83、原生JavaScript用正則表達式清除相同的數組(高效率)



 1 String.prototype.unique=function(){
 2     var x=this.split(/[\r\n]+/);
 3     var y='';
 4     for(var i=0;i<x.length;i++){
 5         if(!new RegExp("^"+x[i].replace(/([^\w])/ig,"\\$1")+"$","igm").test(y)){
 6             y+=x[i]+"\r\n"
 7         }
 8     }
 9     return y
10 }

 


84、原生JavaScript用正則表達式按字母排序，對每行進行數組排序


1 function SetSort(){
2     var text=K1.value.split(/[\r\n]/).sort().join("\r\n");//順序
3     var test=K1.value.split(/[\r\n]/).sort().reverse().join("\r\n");//反序
4     K1.value=K1.value!=text?text:test;
5 }
 


85、原生JavaScript字符串反序


1 function IsReverse(text){
2     return text.split('').reverse().join('');
3 }
 


86、原生JavaScript用正則表達式清除html代碼中的腳本


1 function clear_script(){
2   K1.value=K1.value.replace(/<script.*?>[\s\S]*?<\/script>|\s+on[a-zA-Z]{3,16}\s?=\s?"[\s\S]*?"|\s+on[a-zA-Z]{3,16}\s?=\s?'[\s\S]*?'|\s+on[a-zA-Z]{3,16}\s?=[^ >]+/ig,"");
3 }
 


87、原生JavaScript動態執行JavaScript腳本



1 function javascript(){
2     try{
3       eval(K1.value);
4     }catch(e){
5         alert(e.message);
6     }
7 }

 


88、原生JavaScript動態執行VBScript腳本



1 function vbscript(){
2     try{
3         var script=document.getElementById("K1").value;
4         if(script.trim()=="")return;
5         window.execScript('On Error Resume Next \n'+script+'\n If Err.Number<>0 Then \n MsgBox "請輸入正確的VBScript腳本!",48,"腳本錯誤!" \n End If',"vbscript")
6     }catch(e){
7         alert(e.message);
8     }
9 }

 


89、原生JavaScript實現金額大寫轉換函數



 1 function transform(tranvalue) {
 2   try {
 3     var i = 1;
 4     var dw2 = new Array("", "萬", "億"); //大單位
 5     var dw1 = new Array("拾", "佰", "仟"); //小單位
 6     var dw = new Array("零", "壹", "貳", "叄", "肆", "伍", "陸", "柒", "捌", "玖"); //整數部分用
 7     //如下是小寫轉換成大寫顯示在合計大寫的文本框中     
 8     //分離整數與小數
 9     var source = splits(tranvalue);
10     var num = source[0];
11     var dig = source[1];
12     //轉換整數部分
13     var k1 = 0; //計小單位
14     var k2 = 0; //計大單位
15     var sum = 0;
16     var str = "";
17     var len = source[0].length; //整數的長度
18     for (i = 1; i <= len; i++) {
19       var n = source[0].charAt(len - i); //取得某個位數上的數字
20       var bn = 0;
21       if (len - i - 1 >= 0) {
22         bn = source[0].charAt(len - i - 1); //取得某個位數前一位上的數字
23       }
24       sum = sum + Number(n);
25       if (sum != 0) {
26         str = dw[Number(n)].concat(str); //取得該數字對應的大寫數字，並插入到str字符串的前面
27         if (n == '0') sum = 0;
28       }
29       if (len - i - 1 >= 0) { //在數字範圍內
30         if (k1 != 3) { //加小單位
31           if (bn != 0) {
32             str = dw1[k1].concat(str);
33           }
34           k1++;
35         } else { //不加小單位，加大單位
36           k1 = 0;
37           var temp = str.charAt(0);
38           if (temp == "萬" || temp == "億") //若大單位前沒有數字則捨去大單位
39           str = str.substr(1, str.length - 1);
40           str = dw2[k2].concat(str);
41           sum = 0;
42         }
43       }
44       if (k1 == 3) //小單位到千則大單位進一
45       {
46         k2++;
47       }
48     }
49     //轉換小數部分
50     var strdig = "";
51     if (dig != "") {
52       var n = dig.charAt(0);
53       if (n != 0) {
54         strdig += dw[Number(n)] + "角"; //加數字
55       }
56       var n = dig.charAt(1);
57       if (n != 0) {
58         strdig += dw[Number(n)] + "分"; //加數字
59       }
60     }
61     str += "元" + strdig;
62   } catch(e) {
63     return "0元";
64   }
65   return str;
66 }
67 //拆分整數與小數
68 function splits(tranvalue) {
69   var value = new Array('', '');
70   temp = tranvalue.split(".");
71   for (var i = 0; i < temp.length; i++) {
72     value[i] = temp[i];
73   }
74   return value;
75 }

 


90、原生JavaScript經常使用的正則表達式大收集



 1 匹配中文字符的正則表達式： [\u4e00-\u9fa5] 
 2 匹配雙字節字符（包括漢字在內）：[^\x00-\xff] 
 3 匹配空行的正則表達式：\n[\s| ]*\r 
 4 匹配 HTML 標記的正則表達式：<(.*)>.*<\/\1>|<(.*) \/>
 5 匹配首尾空格的正則表達式：(^\s*)|(\s*$) 
 6 匹配 IP 地址的正則表達式：/(\d+)\.(\d+)\.(\d+)\.(\d+)/g
 7 匹配 Email 地址的正則表達式：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
 8 匹配網址 URL 的正則表達式：http://(/[\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?
 9 sql 語句：^(select|drop|delete|create|update|insert).*$ 
10 非負整數：^\d+$ 
11 正整數：^[0-9]*[1-9][0-9]*$ 
12 非正整數：^((-\d+)|(0+))$ 
13 負整數：^-[0-9]*[1-9][0-9]*$ 
14 整數：^-?\d+$ 
15 非負浮點數：^\d+(\.\d+)?$ 
16 正浮點數：^((0-9)+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$ 
17 非正浮點數：^((-\d+\.\d+)?)|(0+(\.0+)?))$ 
18 英文字符串：^[A-Za-z]+$ 
19 英文大寫串：^[A-Z]+$ 
20 英文小寫串：^[a-z]+$ 
21 英文字符數字串：^[A-Za-z0-9]+$ 
22 英數字加下劃線串：^\w+$ 
23 E-mail地址：^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$ 
24 URL：^[a-zA-Z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\s*)?$ 或：^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$ 
25 郵政編碼：^[1-9]\d{5}$ 
26 電話號碼：^((\(\d{2,3}\))|(\d{3}\-))?(\(0\d{2,3}\)|0\d{2,3}-)?[1-9]\d{6,7}(\-\d{1,4})?$ 
27 手機號碼：^((\(\d{2,3}\))|(\d{3}\-))?13\d{9}$ 
28 雙字節字符（包括漢字在內）：^\x00-\xff 
29 匹配首尾空格：(^\s*)|(\s*$)
30 匹配 HTML 標記：<(.*)>.*<\/\1>|<(.*) \/> 
31 匹配空行：\n[\s| ]*\r 
32 提取信息中的網絡連接：(h|H)(r|R)(e|E)(f|F) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)? 
33 提取信息中的郵件地址：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* 
34 提取信息中的圖片連接：(s|S)(r|R)(c|C) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)? 
35 提取信息中的 IP 地址：(\d+)\.(\d+)\.(\d+)\.(\d+) 
36 提取信息中的中國手機號碼：(86)*0*13\d{9} 
37 提取信息中的中國固定電話號碼：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{8} 
38 提取信息中的中國電話號碼（包括移動和固定電話）：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{7,14} 
39 提取信息中的中國郵政編碼：[1-9]{1}(\d+){5} 
40 提取信息中的浮點數（即小數）：(-?\d*)\.?\d+ 
41 提取信息中的任何數字 ：(-?\d*)(\.\d+)? 
42 IP：(\d+)\.(\d+)\.(\d+)\.(\d+) 
43 電話區號：^0\d{2,3}$
44 騰訊 QQ 號：^[1-9]*[1-9][0-9]*$ 
45 賬號（字母開頭，容許 5-16 字節，容許字母數字下劃線）：^[a-zA-Z][a-zA-Z0-9_]{4,15}$ 
46 中文、英文、數字及下劃線：^[\u4e00-\u9fa5_a-zA-Z0-9]+$

 


91、原生JavaScript實現窗體改變事件resize的操做（兼容因此的瀏覽器）



 1 (function(){
 2     var fn = function(){
 3         var w = document.documentElement ? document.documentElement.clientWidth : document.body.clientWidth
 4             ,r = 1255
 5             ,b = Element.extend(document.body)
 6             ,classname = b.className;
 7         if(w < r){
 8             //當窗體的寬度小於1255的時候執行相應的操做
 9         }else{
10             //當窗體的寬度大於1255的時候執行相應的操做
11         }
12     }
13     if(window.addEventListener){
14         window.addEventListener('resize', function(){ fn(); });
15     }else if(window.attachEvent){
16         window.attachEvent('onresize', function(){ fn(); });
17     }
18     fn();
19 })();

 

92、原生JavaScript用正則清除空格分左右


1 function ltrim(s){ return s.replace( /^(\s*|　*)/, ""); } 
2 function rtrim(s){ return s.replace( /(\s*|　*)$/, ""); } 
3 function trim(s){ return ltrim(rtrim(s));} 
 

93、原生JavaScript判斷變量是否空值



 1 /**
 2  * 判斷變量是否空值
 3  * undefined, null, '', false, 0, [], {} 均返回true，不然返回false
 4  */
 5 function empty(v){
 6     switch (typeof v){
 7         case 'undefined' : return true;
 8         case 'string'    : if(trim(v).length == 0) return true; break;
 9         case 'boolean'   : if(!v) return true; break;
10         case 'number'    : if(0 === v) return true; break;
11         case 'object'    : 
12             if(null === v) return true;
13             if(undefined !== v.length && v.length==0) return true;
14             for(var k in v){return false;} return true;
15             break;
16     }
17     return false;
18 }

 

94、原生JavaScript實現base64解碼



 1 function base64_decode(data){
 2     var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
 3     var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,ac = 0,dec = "",tmp_arr = [];
 4     if (!data) { return data; }
 5     data += '';
 6     do { 
 7         h1 = b64.indexOf(data.charAt(i++));
 8         h2 = b64.indexOf(data.charAt(i++));
 9         h3 = b64.indexOf(data.charAt(i++));
10         h4 = b64.indexOf(data.charAt(i++));
11         bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;
12         o1 = bits >> 16 & 0xff;
13         o2 = bits >> 8 & 0xff;
14         o3 = bits & 0xff;
15         if (h3 == 64) {
16             tmp_arr[ac++] = String.fromCharCode(o1);
17         } else if (h4 == 64) {
18             tmp_arr[ac++] = String.fromCharCode(o1, o2);
19         } else {
20             tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
21         }
22     } while (i < data.length);
23     dec = tmp_arr.join('');
24     dec = utf8_decode(dec);
25     return dec;
26 }

 

95、原生JavaScript實現utf8解碼



 1 function utf8_decode(str_data){
 2     var tmp_arr = [],i = 0,ac = 0,c1 = 0,c2 = 0,c3 = 0;str_data += '';
 3     while (i < str_data.length) {
 4         c1 = str_data.charCodeAt(i);
 5         if (c1 < 128) {
 6             tmp_arr[ac++] = String.fromCharCode(c1);
 7             i++;
 8         } else if (c1 > 191 && c1 < 224) {       
 9             c2 = str_data.charCodeAt(i + 1);
10             tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
11             i += 2;
12         } else {
13             c2 = str_data.charCodeAt(i + 1);
14             c3 = str_data.charCodeAt(i + 2);
15             tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
16             i += 3;
17         }
18     } 
19     return tmp_arr.join('');
20 }

 

96、原生JavaScript獲取窗體可見範圍的寬與高



1 function getViewSize(){
2     var de=document.documentElement;
3     var db=document.body;
4     var viewW=de.clientWidth==0 ?  db.clientWidth : de.clientWidth;
5     var viewH=de.clientHeight==0 ?  db.clientHeight : de.clientHeight;
6     return Array(viewW ,viewH);
7 }

 

97、原生JavaScript判斷IE版本號（既簡潔、又向後兼容！）



1 var _IE = (function(){
2     var v = 3, div = document.createElement('div'), all = div.getElementsByTagName('i');
3     while (
4         div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
5         all[0]
6     );
7     return v > 4 ? v : false ;
8 }());

 

98、原生JavaScript獲取瀏覽器版本號



 1 function browserVersion(types) {
 2     var other = 1;
 3     for (i in types) {
 4         var v = types[i] ? types[i] : i;
 5         if (USERAGENT.indexOf(v) != -1) {
 6             var re = new RegExp(v + '(\\/|\\s|:)([\\d\\.]+)', 'ig');
 7             var matches = re.exec(USERAGENT);
 8             var ver = matches != null ? matches[2] : 0;
 9             other = ver !== 0 && v != 'mozilla' ? 0 : other;
10         } else {
11             var ver = 0;
12         }
13         eval('BROWSER.' + i + '= ver');
14     }
15     BROWSER.other = other;
16 }

 

99、原生JavaScript半角轉換爲全角函數



 1 function ToDBC(str){
 2   var result = '';
 3   for(var i=0; i < str.length; i++){
 4     code = str.charCodeAt(i);
 5     if(code >= 33 && code <= 126){
 6       result += String.fromCharCode(str.charCodeAt(i) + 65248);
 7     }else if (code == 32){
 8       result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);
 9     }else{
10       result += str.charAt(i);
11     }
12   }
13  return result;
14 }

 

100、原生JavaScript全角轉換爲半角函數


 1 function ToCDB(str){
 2   var result = '';
 3   for(var i=0; i < str.length; i++){
 4     code = str.charCodeAt(i);
 5     if(code >= 65281 && code <= 65374){
 6       result += String.fromCharCode(str.charCodeAt(i) - 65248);
 7     }else if (code == 12288){
 8       result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);
 9     }else{
10       result += str.charAt(i);
11     }
12   }
13  return result;
14 }