左右切換式:javascript
html結構css
<
div
id
=
"wrapper"
>
<!-- 最外層部分 -->
<
div
id
=
"banner"
>
<!-- 輪播部分 -->
<
ul
class
=
"imgList"
>
<!-- 圖片部分 -->
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test1.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots1"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test2.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots2"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test3.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots3"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test4.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots4"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test5.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots5"
></
a
></
li
>
</
ul
>
<
img
src
=
"./img/prev.png"
width
=
"20px"
height
=
"40px"
id
=
"prev"
>
<
img
src
=
"./img/next.png"
width
=
"20px"
height
=
"40px"
id
=
"next"
>
<
div
class
=
"bg"
></
div
>
<!-- 圖片底部背景層部分-->
<
ul
class
=
"infoList"
>
<!-- 圖片左下角文字信息部分 -->
<
li
class
=
"infoOn"
>puss in boots1</
li
>
<
li
>puss in boots2</
li
>
<
li
>puss in boots3</
li
>
<
li
>puss in boots4</
li
>
<
li
>puss in boots5</
li
>
</
ul
>
<
ul
class
=
"indexList"
>
<!-- 圖片右下角序號部分 -->
<
li
class
=
"indexOn"
>1</
li
>
<
li
>2</
li
>
<
li
>3</
li
>
<
li
>4</
li
>
<
li
>5</
li
>
</
ul
>
</
div
>
</
div
>
左右切換式則是採用圖片li 浮動,父層元素ul 總寬爲總圖片寬,並設定爲有限banner寬度下隱藏超出寬度的部分html
而後當想切換到某序號的圖片時,則採用其ul 定位 left樣式設定相應屬性值實現java
好比顯示第一張圖片初始定位left爲0px, 要想顯示第二張圖片則須要left:-400px 處理node
<style type=
"text/css"
>
body,div,ul,li,a,img{
margin
:
0
;
padding
:
0
;}
ul,li{
list-style
:
none
;}
a{
text-decoration
:
none
;}
#wrapper{
position
:
relative
;
margin
:
30px
auto
;
width
:
400px
;
height
:
200px
;}
#banner{
position
:
relative
;
width
:
400px
;
height
:
200px
;
overflow
:
hidden
;}
.imgList{
position
:
relative
;
width
:
2000px
;
height
:
200px
;
z-index
:
10
;
overflow
:
hidden
;}
.imgList li{
float
:
left
;
display
:
inline
;}
#prev,
#next{
position
:
absolute
;
top
:
80px
;
z-index
:
20
;
cursor
:
pointer
;opacity:
0.2
;filter:alpha(opacity=
20
);}
#prev{
left
:
10px
;}
#next{
right
:
10px
;}
#prev:hover,
#next:hover{opacity:
0.5
;filter:alpha(opacity=
50
);}
.bg{
position
:
absolute
;
bottom
:
0
;
width
:
400px
;
height
:
40px
;
z-index
:
20
;opacity:
0.4
;filter:alpha(opacity=
40
);
background
:
black
;}
.infoList{
position
:
absolute
;
left
:
10px
;
bottom
:
10px
;
z-index
:
30
;}
.infoList li{
display
:
none
;}
.infoList .infoOn{
display
:
inline
;
color
:
white
;}
.indexList{
position
:
absolute
;
right
:
10px
;
bottom
:
5px
;
z-index
:
30
;}
.indexList li{
float
:
left
;
margin-right
:
5px
;
padding
:
2px
4px
;
border
:
2px
solid
black
;
background
: grey;
cursor
:
pointer
;}
.indexList .indexOn{
background
:
red
;
font-weight
:
bold
;
color
:
white
;}
</style>
var
curIndex = 0,
//當前index
imgLen = $(
".imgList li"
).length;
//圖片總數
// 定時器自動變換2.5秒每次
var
autoChange = setInterval(
function
(){
if
(curIndex < imgLen-1){
curIndex ++;
}
else
{
curIndex = 0;
}
//調用變換處理函數
changeTo(curIndex);
},2500);
//左箭頭滑入滑出事件處理
$(
"#prev"
).hover(
function
(){
//滑入清除定時器
clearInterval(autoChange);
},
function
(){
//滑出則重置定時器
autoChangeAgain();
});
//左箭頭點擊處理
$(
"#prev"
).click(
function
(){
//根據curIndex進行上一個圖片處理
curIndex = (curIndex > 0) ? (--curIndex) : (imgLen - 1);
changeTo(curIndex);
});
//右箭頭滑入滑出事件處理
$(
"#next"
).hover(
function
(){
//滑入清除定時器
clearInterval(autoChange);
},
function
(){
//滑出則重置定時器
autoChangeAgain();
});
//右箭頭點擊處理
$(
"#next"
).click(
function
(){
curIndex = (curIndex < imgLen - 1) ? (++curIndex) : 0;
changeTo(curIndex);
});
//清除定時器時候的重置定時器--封裝
function
autoChangeAgain(){
autoChange = setInterval(
function
(){
if
(curIndex < imgLen-1){
curIndex ++;
}
else
{
curIndex = 0;
}
//調用變換處理函數
changeTo(curIndex);
},2500);
}
function changeTo(num){
var goLeft = num * 400;
$(".imgList").animate({left: "-" + goLeft + "px"},500);
$(".infoList").find("li").removeClass("infoOn").eq(num).addClass("infoOn");
$(".indexList").find("li").removeClass("indexOn").eq(num).addClass("indexOn");
}jquery
4.爲右下角的那幾個li 按鈕綁定事件處理閉包
//對右下角按鈕index進行事件綁定處理等
$(".indexList").find("li").each(function(item){
$(this).hover(function(){
clearInterval(autoChange);
changeTo(item);
curIndex = item;
},function(){
autoChangeAgain();
});
});app
完整代碼函數
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<
head
>
<
meta
http-equiv
=
"Content-Type"
content
=
"text/html; charset=utf-8"
/>
<
title
>圖片輪播 jq(左右切換)</
title
>
<
style
type
=
"text/css"
>
body,div,ul,li,a,img{margin: 0;padding: 0;}
ul,li{list-style: none;}
a{text-decoration: none;}
#wrapper{position: relative;margin: 30px auto;width: 400px;height: 200px;}
#banner{position:relative;width: 400px;height: 200px;overflow: hidden;}
.imgList{position:relative;width:2000px;height:200px;z-index: 10;overflow: hidden;}
.imgList li{float:left;display: inline;}
#prev,
#next{position: absolute;top:80px;z-index: 20;cursor: pointer;opacity: 0.2;filter:alpha(opacity=20);}
#prev{left: 10px;}
#next{right: 10px;}
#prev:hover,
#next:hover{opacity: 0.5;filter:alpha(opacity=50);}
.bg{position: absolute;bottom: 0;width: 400px;height: 40px;z-index:20;opacity: 0.4;filter:alpha(opacity=40);background: black;}
.infoList{position: absolute;left: 10px;bottom: 10px;z-index: 30;}
.infoList li{display: none;}
.infoList .infoOn{display: inline;color: white;}
.indexList{position: absolute;right: 10px;bottom: 5px;z-index: 30;}
.indexList li{float: left;margin-right: 5px;padding: 2px 4px;border: 2px solid black;background: grey;cursor: pointer;}
.indexList .indexOn{background: red;font-weight: bold;color: white;}
</
style
>
</
head
>
<
body
>
<
div
id
=
"wrapper"
>
<!-- 最外層部分 -->
<
div
id
=
"banner"
>
<!-- 輪播部分 -->
<
ul
class
=
"imgList"
>
<!-- 圖片部分 -->
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test1.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots1"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test2.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots2"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test3.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots3"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test4.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots4"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test5.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots5"
></
a
></
li
>
</
ul
>
<
img
src
=
"./img/prev.png"
width
=
"20px"
height
=
"40px"
id
=
"prev"
>
<
img
src
=
"./img/next.png"
width
=
"20px"
height
=
"40px"
id
=
"next"
>
<
div
class
=
"bg"
></
div
>
<!-- 圖片底部背景層部分-->
<
ul
class
=
"infoList"
>
<!-- 圖片左下角文字信息部分 -->
<
li
class
=
"infoOn"
>puss in boots1</
li
>
<
li
>puss in boots2</
li
>
<
li
>puss in boots3</
li
>
<
li
>puss in boots4</
li
>
<
li
>puss in boots5</
li
>
</
ul
>
<
ul
class
=
"indexList"
>
<!-- 圖片右下角序號部分 -->
<
li
class
=
"indexOn"
>1</
li
>
<
li
>2</
li
>
<
li
>3</
li
>
<
li
>4</
li
>
<
li
>5</
li
>
</
ul
>
</
div
>
</
div
>
<
script
type
=
"text/javascript"
src
=
"./js/jquery.min.js"
></
script
>
<
script
type
=
"text/javascript"
>
var curIndex = 0, //當前index
imgLen = $(".imgList li").length; //圖片總數
// 定時器自動變換2.5秒每次
var autoChange = setInterval(function(){
if(curIndex <
imgLen-1
){
curIndex ++;
}else{
curIndex
=
0
;
}
//調用變換處理函數
changeTo(curIndex);
},2500);
//左箭頭滑入滑出事件處理
$("#prev").hover(function(){
//滑入清除定時器
clearInterval(autoChange);
},function(){
//滑出則重置定時器
autoChangeAgain();
});
//左箭頭點擊處理
$("#prev").click(function(){
//根據curIndex進行上一個圖片處理
curIndex = (curIndex > 0) ? (--curIndex) : (imgLen - 1);
changeTo(curIndex);
});
//右箭頭滑入滑出事件處理
$("#next").hover(function(){
//滑入清除定時器
clearInterval(autoChange);
},function(){
//滑出則重置定時器
autoChangeAgain();
});
//右箭頭點擊處理
$("#next").click(function(){
curIndex = (curIndex <
imgLen
- 1) ? (++curIndex) : 0;
changeTo(curIndex);
});
//對右下角按鈕index進行事件綁定處理等
$(".indexList").find("li").each(function(item){
$(this).hover(function(){
clearInterval(autoChange);
changeTo(item);
curIndex
=
item
;
},function(){
autoChangeAgain();
});
});
//清除定時器時候的重置定時器--封裝
function autoChangeAgain(){
autoChange
=
setInterval
(function(){
if(curIndex < imgLen-1){
curIndex ++;
}else{
curIndex
=
0
;
}
//調用變換處理函數
changeTo(curIndex);
},2500);
}
function changeTo(num){
var
goLeft
=
num
* 400;
$(".imgList").animate({left: "-" + goLeft + "px"},500);
$(".infoList").find("li").removeClass("infoOn").eq(num).addClass("infoOn");
$(".indexList").find("li").removeClass("indexOn").eq(num).addClass("indexOn");
}
</script>
</
body
>
</
html
>
var
curIndex = 0,
//當前index
imgArr = getElementsByClassName(
"imgList"
)[0].getElementsByTagName(
"li"
),
//獲取圖片組
imgLen = imgArr.length,
infoArr = getElementsByClassName(
"infoList"
)[0].getElementsByTagName(
"li"
),
//獲取圖片info組
indexArr = getElementsByClassName(
"indexList"
)[0].getElementsByTagName(
"li"
);
//獲取控制index組
// 定時器自動變換2.5秒每次
var
autoChange = setInterval(
function
(){
if
(curIndex < imgLen -1){
curIndex ++;
}
else
{
curIndex = 0;
}
//調用變換處理函數
changeTo(curIndex);
},2500);
//清除定時器時候的重置定時器--封裝
function
autoChangeAgain(){
autoChange = setInterval(
function
(){
if
(curIndex < imgLen -1){
curIndex ++;
}
else
{
curIndex = 0;
}
//調用變換處理函數
changeTo(curIndex);
},2500);
}
//經過class獲取節點
function
getElementsByClassName(className){
var
classArr = [];
var
tags = document.getElementsByTagName(
'*'
);
for
(
var
item
in
tags){
if
(tags[item].nodeType == 1){
if
(tags[item].getAttribute(
'class'
) == className){
classArr.push(tags[item]);
}
}
}
return
classArr;
//返回
}
// 判斷obj是否有此class
function
hasClass(obj,cls){
//class位於單詞邊界
return
obj.className.match(
new
RegExp(
'(\\s|^)'
+ cls +
'(\\s|$)'
));
}
//給 obj添加class
function
addClass(obj,cls){
if
(!
this
.hasClass(obj,cls)){
obj.className += cls;
}
}
//移除obj對應的class
function
removeClass(obj,cls){
if
(hasClass(obj,cls)){
var
reg =
new
RegExp(
'(\\s|^)'
+ cls +
'(\\s|$)'
);
obj.className = obj.className.replace(reg,
''
);
}
}
//圖片組相對原始左移dist px距離
function
goLeft(elem,dist){
if
(dist == 400){
//第一次時設置left爲0px 或者直接使用內嵌法 style="left:0;"
elem.style.left =
"0px"
;
}
var
toLeft;
//判斷圖片移動方向是否爲左
dist = dist + parseInt(elem.style.left);
//圖片組相對當前移動距離
if
(dist<0){
toLeft =
false
;
dist = Math.abs(dist);
}
else
{
toLeft =
true
;
}
for
(
var
i=0;i<= dist/20;i++){
//這裏設定緩慢移動,10階每階40px
(
function
(_i){
var
pos = parseInt(elem.style.left);
//獲取當前left
setTimeout(
function
(){
pos += (toLeft)? -(_i * 20) : (_i * 20);
//根據toLeft值指定圖片組位置改變
//console.log(pos);
elem.style.left = pos +
"px"
;
},_i * 25);
//每階間隔50毫秒
})(i);
}
}
//左右切換處理函數
function
changeTo(num){
//設置image
var
imgList = getElementsByClassName(
"imgList"
)[0];
goLeft(imgList,num*400);
//左移必定距離
//設置image 的 info
var
curInfo = getElementsByClassName(
"infoOn"
)[0];
removeClass(curInfo,
"infoOn"
);
addClass(infoArr[num],
"infoOn"
);
//設置image的控制下標 index
var
_curIndex = getElementsByClassName(
"indexOn"
)[0];
removeClass(_curIndex,
"indexOn"
);
addClass(indexArr[num],
"indexOn"
);
}
//給左右箭頭和右下角的圖片index添加事件處理
function
addEvent(){
for
(
var
i=0;i<imgLen;i++){
//閉包防止做用域內活動對象item的影響
(
function
(_i){
//鼠標滑過則清除定時器,並做變換處理
indexArr[_i].onmouseover =
function
(){
clearTimeout(autoChange);
changeTo(_i);
curIndex = _i;
};
//鼠標滑出則重置定時器處理
indexArr[_i].onmouseout =
function
(){
autoChangeAgain();
};
})(i);
}
//給左箭頭prev添加上一個事件
var
prev = document.getElementById(
"prev"
);
prev.onmouseover =
function
(){
//滑入清除定時器
clearInterval(autoChange);
};
prev.onclick =
function
(){
//根據curIndex進行上一個圖片處理
curIndex = (curIndex > 0) ? (--curIndex) : (imgLen - 1);
changeTo(curIndex);
};
prev.onmouseout =
function
(){
//滑出則重置定時器
autoChangeAgain();
};
//給右箭頭next添加下一個事件
var
next = document.getElementById(
"next"
);
next.onmouseover =
function
(){
clearInterval(autoChange);
};
next.onclick =
function
(){
curIndex = (curIndex < imgLen - 1) ? (++curIndex) : 0;
changeTo(curIndex);
};
next.onmouseout =
function
(){
autoChangeAgain();
};
}
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<
head
>
<
meta
http-equiv
=
"Content-Type"
content
=
"text/html; charset=utf-8"
/>
<
title
>圖片輪播 js原生(左右切換)</
title
>
<
style
type
=
"text/css"
>
body,div,ul,li,a,img{margin: 0;padding: 0;}
ul,li{list-style: none;}
a{text-decoration: none;}
#wrapper{position: relative;margin: 30px auto;width: 400px;height: 200px;}
#banner{position:relative;width: 400px;height: 200px;overflow: hidden;}
.imgList{position:relative;width:2000px;height:200px;z-index: 10;overflow: hidden;}
.imgList li{float:left;display: inline;}
#prev,
#next{position: absolute;top:80px;z-index: 20;cursor: pointer;opacity: 0.2;filter:alpha(opacity=20);}
#prev{left: 10px;}
#next{right: 10px;}
#prev:hover,
#next:hover{opacity: 0.5;filter:alpha(opacity=50);}
.bg{position: absolute;bottom: 0;width: 400px;height: 40px;z-index:20;opacity: 0.4;filter:alpha(opacity=40);background: black;}
.infoList{position: absolute;left: 10px;bottom: 10px;z-index: 30;}
.infoList li{display: none;}
.infoList .infoOn{display: inline;color: white;}
.indexList{position: absolute;right: 10px;bottom: 5px;z-index: 30;}
.indexList li{float: left;margin-right: 5px;padding: 2px 4px;border: 2px solid black;background: grey;cursor: pointer;}
.indexList .indexOn{background: red;font-weight: bold;color: white;}
</
style
>
</
head
>
<
body
>
<
div
id
=
"wrapper"
>
<!-- 最外層部分 -->
<
div
id
=
"banner"
>
<!-- 輪播部分 -->
<
ul
class
=
"imgList"
>
<!-- 圖片部分 -->
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test1.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots1"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test2.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots2"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test3.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots3"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test4.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots4"
></
a
></
li
>
<
li
><
a
href
=
"#"
><
img
src
=
"./img/test5.jpg"
width
=
"400px"
height
=
"200px"
alt
=
"puss in boots5"
></
a
></
li
>
</
ul
>
<
img
src
=
"./img/prev.png"
width
=
"20px"
height
=
"40px"
id
=
"prev"
>
<
img
src
=
"./img/next.png"
width
=
"20px"
height
=
"40px"
id
=
"next"
>
<
div
class
=
"bg"
></
div
>
<!-- 圖片底部背景層部分-->
<
ul
class
=
"infoList"
>
<!-- 圖片左下角文字信息部分 -->
<
li
class
=
"infoOn"
>puss in boots1</
li
>
<
li
>puss in boots2</
li
>
<
li
>puss in boots3</
li
>
<
li
>puss in boots4</
li
>
<
li
>puss in boots5</
li
>
</
ul
>
<
ul
class
=
"indexList"
>
<!-- 圖片右下角序號部分 -->
<
li
class
=
"indexOn"
>1</
li
>
<
li
>2</
li
>
<
li
>3</
li
>
<
li
>4</
li
>
<
li
>5</
li
>
</
ul
>
</
div
>
</
div
>
<
script
type
=
"text/javascript"
>
var curIndex = 0, //當前index
imgArr = getElementsByClassName("imgList")[0].getElementsByTagName("li"), //獲取圖片組
imgLen = imgArr.length,
infoArr = getElementsByClassName("infoList")[0].getElementsByTagName("li"), //獲取圖片info組
indexArr = getElementsByClassName("indexList")[0].getElementsByTagName("li"); //獲取控制index組
// 定時器自動變換2.5秒每次
var autoChange = setInterval(function(){
if(curIndex <
imgLen
-1){
curIndex ++;
}else{
curIndex
=
0
;
}
//調用變換處理函數
changeTo(curIndex);
},2500);
//清除定時器時候的重置定時器--封裝
function autoChangeAgain(){
autoChange
=
setInterval
(function(){
if(curIndex < imgLen -1){
curIndex ++;
}else{
curIndex
=
0
;
}
//調用變換處理函數
changeTo(curIndex);
},2500);
}
//調用添加事件處理
addEvent();
//給左右箭頭和右下角的圖片index添加事件處理
function addEvent(){
for(var
i
=
0
;i<imgLen;i++){
//閉包防止做用域內活動對象item的影響
(function(_i){
//鼠標滑過則清除定時器,並做變換處理
indexArr[_i]
.onmouseover
=
function
(){
clearTimeout(autoChange);
changeTo(_i);
curIndex
=
_i
;
};
//鼠標滑出則重置定時器處理
indexArr[_i]
.onmouseout
=
function
(){
autoChangeAgain();
};
})(i);
}
//給左箭頭prev添加上一個事件
var
prev
=
document
.getElementById("prev");
prev.onmouseover
=
function
(){
//滑入清除定時器
clearInterval(autoChange);
};
prev.onclick
=
function
(){
//根據curIndex進行上一個圖片處理
curIndex = (curIndex > 0) ? (--curIndex) : (imgLen - 1);
changeTo(curIndex);
};
prev.onmouseout = function(){
//滑出則重置定時器
autoChangeAgain();
};
//給右箭頭next添加下一個事件
var next = document.getElementById("next");
next.onmouseover = function(){
clearInterval(autoChange);
};
next.onclick = function(){
curIndex = (curIndex <
imgLen
- 1) ? (++curIndex) : 0;
changeTo(curIndex);
};
next.onmouseout
=
function
(){
autoChangeAgain();
};
}
//左右切換處理函數
function changeTo(num){
//設置image
var
imgList
=
getElementsByClassName
("imgList")[0];
goLeft(imgList,num*400); //左移必定距離
//設置image 的 info
var
curInfo
=
getElementsByClassName
("infoOn")[0];
removeClass(curInfo,"infoOn");
addClass(infoArr[num],"infoOn");
//設置image的控制下標 index
var
_curIndex
=
getElementsByClassName
("indexOn")[0];
removeClass(_curIndex,"indexOn");
addClass(indexArr[num],"indexOn");
}
//圖片組相對原始左移dist px距離
function goLeft(elem,dist){
if(dist == 400){ //第一次時設置left爲0px 或者直接使用內嵌法
style
=
"left:0;"
elem.style.left
=
"0px"
;
}
var toLeft; //判斷圖片移動方向是否爲左
dist
= dist + parseInt(elem.style.left); //圖片組相對當前移動距離
if(dist<0){
toLeft
=
false
;
dist
=
Math
.abs(dist);
}else{
toLeft
=
true
;
}
for(var
i
=
0
;i<= dist/20;i++){ //這裏設定緩慢移動,10階每階40px
(function(_i){
var
pos
=
parseInt
(elem.style.left); //獲取當前left
setTimeout(function(){
pos += (toLeft)? -(_i * 20) : (_i * 20); //根據toLeft值指定圖片組位置改變
//console.log(pos);
elem.style.left
=
pos
+ "px";
},_i * 25); //每階間隔50毫秒
})(i);
}
}
//經過class獲取節點
function getElementsByClassName(className){
var classArr = [];
var
tags
=
document
.getElementsByTagName('*');
for(var item in tags){
if(tags[item].nodeType == 1){
if(tags[item].getAttribute('class') == className){
classArr.push(tags[item]);
}
}
}
return classArr; //返回
}
// 判斷obj是否有此class
function hasClass(obj,cls){ //class位於單詞邊界
return obj.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'));
}
//給 obj添加class
function addClass(obj,cls){
if(!this.hasClass(obj,cls)){
obj.className += cls;
}
}
//移除obj對應的class
function removeClass(obj,cls){
if(hasClass(obj,cls)){
var
reg
=
new
RegExp('(\\s|^)' + cls + '(\\s|$)');
obj.className
= obj.className.replace(reg,'');
}
}
</script>
</
body
>
</
html
>