为什么同样设置的速度是10px，移进移出的速度为什么不一样？
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>速度动画！！！测试</title>
<style>
#div1 {
background-color: red;
width: 200px;
height: 200px;
position: relative;
left: -200px;
top: 0;
}
#div1 span {
width: 20px;
height: 50px;
background: blue;
position: absolute;
left: 200px;
top: 75px;
}
</style>
<script>
window.onload = function () {
var oDiv = document.getElementById('div1');
oDiv.onmouseover = function () {
startMove();
}
oDiv.onmouseout = function () {
startMove1();
}
}
var timer = null;
function startMove() {
clearInterval(timer);
var oDiv = document.getElementById('div1');
timer = setInterval(function () {
if (oDiv.offsetLeft>0) {
clearInterval(timer);
}
else {
oDiv.style.left = oDiv.offsetLeft+10+'px';
}
}, 30)
}
function startMove1() {
clearInterval(timer);
var oDiv = document.getElementById('div1');
timer = setInterval(function () {
if (oDiv.offsetLeft< -100) {
clearInterval(timer);
}
else {
oDiv.style.left = oDiv.offsetLeft -10+ 'px';
}
}, 30);
}
</script>
</head>
<body>
<div id="div1">
<span id="share">分享！</span>
</div>
</body>
</html>
