js仿拉勾网首页穿墙广告效果

效果图：

代码如下：

<!doctype html>
<html>
<head>
 <meta charset="UTF-8">
 <title>Title</title>
<style>
*{margin:0; padding:0; list-style:none;}
ul{ overflow:hidden; width:630px; margin:100px auto;}
ul li{ float:left; position:relative; width:200px; height:200px; background:#ccc; margin:5px; overflow:hidden;}
ul li span{ position:absolute; width:100%; height:100%; background:rgba(255,0,0,0.3); left:-200px; top:0;}
</style>
<script>
function getStyle(obj,sName){
 return (obj.currentStyle||getComputedStyle(obj,false))[sName];
}
function move(obj,json,options){
 options = options||{};
 options.duration = options.duration||700;
 options.easing = options.easing||'ease-out';
 var start = {};
 var dis = {};
 for(var name in json){
 start[name] = parseFloat(getStyle(obj,name));
 dis[name] = json[name]-start[name];
 }
 var count = Math.floor(options.duration/30);
 var n = 0;
 clearInterval(obj.timer);
 obj.timer = setInterval(function(){
 n++;
 for(var name in json){
 switch(options.easing){
 case 'linear':
  var cur = start[name]+dis[name]*n/count;
  break;
 case 'ease-in':
  var a = n/count;
  var cur = start[name]+dis[name]*Math.pow(a,3);
  break;
 case 'ease-out':
  var a = 1-n/count;
  var cur = start[name]+dis[name]*(1-Math.pow(a,3));
  break;
 }
 if(name=='opacity'){
 obj.style.opacity = cur;
 obj.style.filter = 'alpha(opacity:'+cur*100+')';
 }else{
 obj.style[name] = cur+'px';
 }
 }
 if(n==count){
 clearInterval(obj.timer);
 options.complete&&options.complete();
 }
 },30);
}
function a2d(n){
 return n*180/Math.PI;
}
function hoverDir(ev,obj){
 var a = ev.clientX-obj.offsetLeft-obj.offsetWidth/2;
 var b = obj.offsetTop+obj.offsetHeight/2-ev.clientY;

 return Math.round((a2d(Math.atan2(b,a))+180)/90)%4;
}
function through(obj){
 var oS = obj.children[0];
 obj.onmouseenter = function(ev){
 var oEvent = ev||event;
 var dir = hoverDir(oEvent,obj);
 switch(dir){
 case 0:
 //左
 oS.style.left = '-200px';
 oS.style.top = 0;
 break;
 case 1:
 //下
 oS.style.left = 0;
 oS.style.top = '200px';
 break;
 case 2:
 //右
 oS.style.left = '200px';
 oS.style.top = 0;
 break;
 case 3:
 //上
 oS.style.left = 0;
 oS.style.top = '-200px';
 break;
 }
 move(oS,{left:0,top:0});
 };
 obj.onmouseleave = function(ev){
 var oEvent = ev||event;
 var dir = hoverDir(oEvent,obj);
 switch(dir){
 case 0:
 move(oS,{left:-200,top:0});
 break;
 case 1:
 move(oS,{left:0,top:200});
 break;
 case 2:
 move(oS,{left:200,top:0});
 break;
 case 3:
 move(oS,{left:0,top:-200});
 break;
 }
 };
}
window.onload = function(){
 var aLi = document.getElementsByTagName('li');
 for(var i=0;i<aLi.length;i++){
 through(aLi[i]);
 }
};
</script>
</head>
<body>
 <ul>
 <li><span></span></li>
 <li><span></span></li>
 <li><span></span></li>
 <li><span></span></li>
 <li><span></span></li>
 <li><span></span></li>
 </ul>
</body>
</html>

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