1.分享到
通过目标值来确定方向!
<style>
#div1{width: 100px;height: 200px;position: absolute;left: -100px;background-color: gray;}
#div1 span{width: 20px;height: 60px;line-height: 20px;text-align:center;left: 100px;top: 70px; background-color: yellow;position: absolute;}
</style>
<script>
window.onload = function(){
var oDiv = document.getElementById(‘div1‘);
oDiv.onmouseover = function(){
startMove(0);
}
oDiv.onmouseout = function(){
startMove(-100);
}
}
var timer = null;
function startMove(iTarget){
var oDiv = document.getElementById(‘div1‘);
var iSpeed = 10 ;
oDiv.offsetLeft < iTarget ? iSpeed = 10 : iSpeed = -10;
clearInterval(timer);
timer = setInterval(function(){
if(oDiv.offsetLeft == iTarget){
clearInterval(timer);
}else{
oDiv.style.left = oDiv.offsetLeft + iSpeed + ‘px‘;
}
},30);
}
</script>
</head>
<body>
<div id="div1">
<span>分享到</span>
</div>
</body>
原文：http://www.cnblogs.com/bravolove/p/5935329.html