Javascript implements Taobao slideshow advertising display effect

Javascript implements Taobao slideshow advertising display effect_javascript skills

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Release： 2016-05-16 16:02:06

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The example in this article describes the method of using JavaScript to achieve the display effect of Taobao slideshow ads. Share it with everyone for your reference. The details are as follows:

1. The renderings are as follows:

2. Code part:

JS code part:

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 part:

*{ 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 part:

<!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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I hope this article will be helpful to everyone’s JavaScript programming design.