iTarget=-200px，为什么oDiv.offsetLeft=-190.5px就不执行if(oDiv.offsetLeft==iTarget){ clearInterval(timer); } else{ oDiv.style.left=oDiv.offsetLeft+speed+'px';}
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>速度动画</title>
<style>
body,div,span{margin:0;padding: 0;}
#div1{width:200px;height: 200px;background-color: red;position: relative;left: -200px;top: 0px;}
#div1 span{width:20px;height: 50px;background-color: blue;position: absolute;left:200px;top:75px;}
</style>
<script>
window.onload=function(){
var oDiv=document.getElementById('div1');
oDiv.onmouseover=function(){
startMove(0);
}
oDiv.onmouseout=function(){
startMove(-200);
}
}
var timer=null;
function startMove(iTarget){
clearInterval(timer);
var oDiv=document.getElementById('div1');
timer=setInterval(function(){
var speed=(iTarget-oDiv.offsetLeft)/20;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(oDiv.offsetLeft==iTarget){
clearInterval(timer);
}
else{
oDiv.style.left=oDiv.offsetLeft+speed+'px';}
},30)
}
</script>
</head>
<body>
<div id="div1"><span id="share">分享</span></div>
</body>
</html>
去看天荒地老
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