运动函数：
// JavaScript Document
function startMove(obj,json,endFn){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var bBtn = true;
for(var attr in json){
var iCur = 0;
if(attr == 'opacity'){
if(Math.round(parseFloat(getStyle(obj,attr))*100)==0){
iCur = Math.round(parseFloat(getStyle(obj,attr))*100);
}
else{
iCur = Math.round(parseFloat(getStyle(obj,attr))*100) || 100;
}
}
else{
iCur = parseInt(getStyle(obj,attr)) || 0;
}
var iSpeed = (json[attr] - iCur)/20;
iSpeed = iSpeed >0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
if(iCur!=json[attr]){
bBtn = false;
}
if(attr == 'opacity'){
obj.style.filter = 'alpha(opacity=' +(iCur + iSpeed)+ ')';
obj.style.opacity = (iCur + iSpeed)/100;
}
else{
obj.style[attr] = iCur + iSpeed + 'px';
}
}
if(bBtn){
clearInterval(obj.timer);
if(endFn){
endFn.call(obj);
}
}
},30);
}
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
测试案例：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>放大</title>
<script src="move.js"></script>
<style>
*{margin: 0;padding: 0}
#div1{width: 100px;height: 100px;background: #ddd;position: relative;top: 200px;left: 200px;}
</style>
</head>
<body>
<div id="div1"></div>
<script>
var div1=document.getElementById("div1");
div1.onmouseover=function(){
startMove(this,{200,height:200,left:150,top:150})
}
div1.onmouseout=function(){
startMove(this,{100,height:100,left:200,top:200})
}
</script>
</body>
</html>