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javascript實現淘寶投影片廣告展示效果_javascript技巧

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發布： 2016-05-16 16:02:06

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本文實例講述了javascript實現淘寶幻燈片廣告展示效果的方法。分享給大家供大家參考。具體如下：

一、效果圖如下：

二、程式碼部分：

JS程式碼部分：

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&#63;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]; 
  }
};

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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;
}

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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>

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希望本文所述對大家的javascript程式設計有所幫助。