仿拉勾网首页穿墙广告效果

发表于2017-03-07 16:46:50

分享代码如下:


<!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>


本文转载自:http://www.qdfuns.com/notes/42016/e929c55b9b576bf1a476b684a0ad13a3.html

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