JavaScript實現的輪播圖

      當初學習JavaScript的時候，想學習輪播圖是怎麼寫的，結果在百度搜了半天也很難搜出一個完整的輪播圖案例。如今就分享一個用js寫的輪播圖供你們參考和學習，有什麼錯誤的地方或有更好的方法也請你們提出來，共同討論和進步。

　　下面是效果圖。

     

　　

<div id="play">

<ol> 　　　　//按鈕
<li class="active">1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
</ol>
<ul>
<li><a href="http:///"><img src="images/1.jpg" alt="廣告一" /></a></li>
<li><a href="http:///"><img src="images/2.jpg" alt="廣告二" /></a></li>
<li><a href="http:///"><img src="images/3.jpg" alt="廣告三" /></a></li>
<li><a href="http:///"><img src="images/4.jpg" alt="廣告四" /></a></li>
<li><a href="http://"><img src="images/5.jpg" alt="廣告五" /></a></li>
</ul>

</div>

 

* { padding: 0; margin: 0; }
li { list-style: none; }
img { border: none; }

body { background: #ecfaff; }

#play { width: 470px; height: 150px; overflow: hidden; border: 1px solid #d8d8d8; margin: 100px auto 0; position: relative;}
.packet { width:470px; height: 150px; position: relative; overflow:-hidden;}
ol { position: absolute; right: 5px; bottom: 5px; z-index: 2; }
ol li { float: left; margin-right: 3px; display: inline; cursor: pointer; background: #fcf2cf; border: 1px solid #f47500; padding: 2px 6px; color: #d94b01; font-family: arial; font-size: 12px;border-radius: 50%; }
.active { padding: 3px 8px; font-weight: bold; color: #ffffff; background: #ffb442; position: relative; bottom: 2px; }

ul { position: absolute; top: 0px; left: 0px; z-index: 1; background:white; width: 2350px; height: 150px; }
ul li { position:relative; width: 470px; height: 150px; top:0px; left:0px; float: left;}
ul img { float: left; width: 470px; height: 150px; }

 

下面是js

<script>

window.onload = function(){
var aLi = document.getElementsByTagName('ol')[0].getElementsByTagName('li');
var oUl = document.getElementsByTagName('ul')[0];
var aLi2 = oUl.getElementsByTagName('li');
var iNow = 0;
var iNow2 = 0;
var timer = null;

for(var i=0;i<aLi.length;i++){
aLi[i].index = i;
aLi[i].onmouseover = function(){
for(var i=0;i<aLi.length;i++){
aLi[i].className = '';
};
this.className = 'active';

startMove(oUl,{'left' : -470*this.index});  　　//startMove是封裝的一個基於時間的運動框架，在文章最後有展現源碼，有興趣的能夠看一看
iNow = this.index;
iNow2 = this.index;
clearInterval(timer);
};

aLi[i].onmouseout = function(){
timer = setInterval(toRun,2000);
};
}

timer = setInterval(toRun,2000);

function toRun(){
if(iNow==aLi.length-1){
iNow = 0;
aLi2[0].style.position = 'relative';
aLi2[0].style.left = 470 * aLi2.length + 'px';
}
else{
iNow++;
}

iNow2++;

for(var i=0;i<aLi.length;i++){
aLi[i].className = '';
};
aLi[iNow].className = 'active';
startMove(oUl,{ left : -470 * iNow2},function(){

clearInterval(timer);
timer = setInterval(toRun,2000);

if(iNow==0){
aLi2[0].style.position = 'static';
oUl.style.left = 0;
iNow2 = 0;
}

});
}

};

 

</script>

 

startMove源碼

function startMove(obj,json,times,fx,fn){ //obj:對象 json：目的 times：時間 fx：方式，例如linear fn：回調函數

if( typeof times == 'undefined' ){
times = 400;
fx = 'linear';
}

if( typeof times == 'string' ){
if(typeof fx == 'function'){
fn = fx;
}
fx = times;
times = 400;
}
else if(typeof times == 'function'){
fn = times;
times = 400;
fx = 'linear';
}
else if(typeof times == 'number'){
if(typeof fx == 'function'){
fn = fx;
fx = 'linear';
}
else if(typeof fx == 'undefined'){
fx = 'linear';
}
}

var iCur = {};

for(var attr in json){
iCur[attr] = 0;

if( attr == 'opacity' ){
iCur[attr] = Math.round(getStyle(obj,attr)*100);
}
else{
iCur[attr] = parseInt(getStyle(obj,attr));
}

}

var startTime = now();

clearInterval(obj.timer);

obj.timer = setInterval(function(){

var changeTime = now();

var t = times - Math.max(0,startTime - changeTime + times); //0到2000

for(var attr in json){

var value = Tween[fx](t,iCur[attr],json[attr]-iCur[attr],times);

if(attr == 'opacity'){
obj.style.opacity = value/100;
obj.style.filter = 'alpha(opacity='+value+')';
}
else{
obj.style[attr] = value + 'px';
}

}

if(t == times){
clearInterval(obj.timer);
if(fn){
fn.call(obj);
}
}

},13);

function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}

function now(){
return (new Date()).getTime();
}

}

var Tween = { linear: function (t, b, c, d){ //勻速 return c*t/d + b; }, easeIn: function(t, b, c, d){ //加速曲線 return c*(t/=d)*t + b; }, easeOut: function(t, b, c, d){ //減速曲線 return -c *(t/=d)*(t-2) + b; }, easeBoth: function(t, b, c, d){ //加速減速曲線 if ((t/=d/2) < 1) { return c/2*t*t + b; } return -c/2 * ((--t)*(t-2) - 1) + b; }, easeInStrong: function(t, b, c, d){ //加加速曲線 return c*(t/=d)*t*t*t + b; }, easeOutStrong: function(t, b, c, d){ //減減速曲線 return -c * ((t=t/d-1)*t*t*t - 1) + b; }, easeBothStrong: function(t, b, c, d){ //加加速減減速曲線 if ((t/=d/2) < 1) { return c/2*t*t*t*t + b; } return -c/2 * ((t-=2)*t*t*t - 2) + b; }, elasticIn: function(t, b, c, d, a, p){ //正弦衰減曲線（彈動漸入） if (t === 0) { return b; } if ( (t /= d) == 1 ) { return b+c; } if (!p) { p=d*0.3; } if (!a || a < Math.abs(c)) { a = c; var s = p/4; } else { var s = p/(2*Math.PI) * Math.asin (c/a); } return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b; }, elasticOut: function(t, b, c, d, a, p){ //正弦加強曲線（彈動漸出） if (t === 0) { return b; } if ( (t /= d) == 1 ) { return b+c; } if (!p) { p=d*0.3; } if (!a || a < Math.abs(c)) { a = c; var s = p / 4; } else { var s = p/(2*Math.PI) * Math.asin (c/a); } return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b; }, elasticBoth: function(t, b, c, d, a, p){ if (t === 0) { return b; } if ( (t /= d/2) == 2 ) { return b+c; } if (!p) { p = d*(0.3*1.5); } if ( !a || a < Math.abs(c) ) { a = c; var s = p/4; } else { var s = p/(2*Math.PI) * Math.asin (c/a); } if (t < 1) { return - 0.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b; } return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*0.5 + c + b; }, backIn: function(t, b, c, d, s){ //回退加速（回退漸入） if (typeof s == 'undefined') { s = 1.70158; } return c*(t/=d)*t*((s+1)*t - s) + b; }, backOut: function(t, b, c, d, s){ if (typeof s == 'undefined') { s = 3.70158; //回縮的距離 } return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b; }, backBoth: function(t, b, c, d, s){ if (typeof s == 'undefined') { s = 1.70158; } if ((t /= d/2 ) < 1) { return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b; } return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b; }, bounceIn: function(t, b, c, d){ //彈球減振（彈球漸出） return c - Tween['bounceOut'](d-t, 0, c, d) + b; }, bounceOut: function(t, b, c, d){ if ((t/=d) < (1/2.75)) { return c*(7.5625*t*t) + b; } else if (t < (2/2.75)) { return c*(7.5625*(t-=(1.5/2.75))*t + 0.75) + b; } else if (t < (2.5/2.75)) { return c*(7.5625*(t-=(2.25/2.75))*t + 0.9375) + b; } return c*(7.5625*(t-=(2.625/2.75))*t + 0.984375) + b; }, bounceBoth: function(t, b, c, d){ if (t < d/2) { return Tween['bounceIn'](t*2, 0, c, d) * 0.5 + b; } return Tween['bounceOut'](t*2-d, 0, c, d) * 0.5 + c*0.5 + b; }}