javascript实现淘宝幻灯片广告展示效果

本文实例讲述了javascript实现淘宝幻灯片广告展示效果的方法。分享给大家供大家参考。具体如下：

一、效果图如下：

二、代码部分：

JS代码部分：

function getClass(oParent,name){
  var arr=[];
  var oBj=oParent.getElementsByTagName("*");
  for(var i=0;i<oBj.length;i++){
    if(oBj[i].className==name){
      arr.push(oBj[i]);
    }
  }
  return arr;
}
function startmove(obj,json,fnEnd){
  var cur=0;
  clearInterval(obj.timer);
  obj.timer=setInterval(function(){
    var oStop=true;
    for(var attr in json){
      if(attr=='opacity'){
        cur=Math.round(parseFloat(getStyle(obj,attr)*100));
      }else{
        cur=parseInt(getStyle(obj,attr));
      }
      var speed=(json[attr]-cur)/10;
      speed=speed>0?Math.ceil(speed):Math.floor(speed);
      if(cur!=json[attr]){
        oStop=false;
      }
      if(attr=='opacity'){
        obj.style[attr]=(cur+speed)/100;
        obj.style.filter="alpha(opacity:"+cur+speed+")";
      }else{
        obj.style[attr]=cur+speed+"px";
      }
    }
    if(oStop){
      clearInterval(obj.timer);
      if(fnEnd)fnEnd();
    }
  },30); 

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

CSS部分：

*{ margin: 0px; padding: 0px; }
img{
border: none; width: 470px; height: 150px;
float: left;
}
.pic_body li{
width: 470px; height: 150px;
float: left; z-index: 3001; }
ul{
 list-style: none; position: absolute; top: 0px; left: 0px;
 width: 470px; height: 150px; background: yellow; z-index: 3000;
}
#div1{ border: 1px solid black; width: 470px; height: 150px;
 position: relative; margin: 100px auto; padding: 0px;
 overflow: hidden;
}
#div1 ol{ bottom: 10px; right: 10px;
position: absolute; z-index: 9999;
}
ol li{ background: yellow; float: left;
display: inline; margin-right: 3px; padding: 3px 4px;
position: relative; top: 0px; left: 0px;
font-family: arial; font-size: 12px;
cursor: pointer; filter: alpha(opacity:60); opacity: 0.6;
border: 1px solid black;
}
.active{ background: yellow; font-weight: bolder;
padding: 4px 6px; filter: alpha(opacity:100); opacity: 1;
} 

HTML部分：

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <link href="css.css" rel="stylesheet" type="text/css">
  <script src="myscript.js"></script>
  <script>
    window.onload=function() {
      var now = 0;
      var oDiv = document.getElementById('div1');
      var oOl = oDiv.getElementsByTagName('ol')[0];
      var oLi = oOl.getElementsByTagName('li');
      var oUl = getClass(oDiv, 'pic_body')[0];
      for(var i=0;i<oLi.length;i++){
        oLi[i].index=i;
        oLi[i].onclick=function(){
          now=this.index;
          tab();
        };
      }
      function tab(){
        for(var i=0;i<oLi.length;i++){
          oLi[i].className='';
        }
        oLi[now].className='active';
        startmove(oUl,{top:-150*now});
      };
      function next(){
        now++;
        if(now==oLi.length){
          now=0;
        }
        tab();
      };
      var timer=setInterval(next,3000);
      oUl.onmouseover=function(){
        clearInterval(timer);
      };
      oUl.onmouseout=function(){
        timer=setInterval(next,3000);
      };
    }
  </script>
</head>
<body>
<div id="div1">
  <ol>
    <li class="active">1</li>
    <li>2</li>
    <li>3</li>
    <li>4</li>
    <li>5</li>
  </ol>
  <ul class="pic_body">
    <li><img src="image/1.jpg"></li>
    <li><img src="image/2.jpg"></li>
    <li><img src="image/3.jpg"></li>
    <li><img src="image/4.jpg"></li>
    <li><img src="image/5.jpg"></li>
  </ul>
</div>
</body>
</html>

希望本文所述对大家的javascript程序设计有所帮助。