代码:

 

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
div {
width: 200px;
height: 200px;
margin: 20px;
float: left;
background: yellow;
}
</style>
<script>
window.onload = function () {
var oDiv1 = document.getElementById("div1");
oDiv1.onmouseover = function () {
startMove(this, 400);
}

oDiv1.onmouseout = function () {
startMove(this, 200);
};

function startMove(obj, iTarger) {
clearInterval(obj.timer);
obj.timer = setInterval(function () {
var speed = (iTarger - obj.offsetHeight) / 6;//此处切记结果不要写反
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
if (obj.offsetHeight == iTarger) {
clearInterval(obj.timer);//此处需注意!
} else {
obj.style.height = obj.offsetHeight + speed + "px";
}
}, 30);
}


var oDiv2 = document.getElementById("div2");
oDiv2.onmouseover = function () {
startMove_1(this, 400);
}

oDiv2.onmouseout = function () {
startMove_1(this, 200);
};

function startMove_1(obj, iTarger) {
clearInterval(obj.timer);
obj.timer = setInterval(function () {
var speed = (iTarger - obj.offsetWidth) / 4;
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
if (obj.offsetWidth == iTarger) {
clearInterval(obj.timer);
} else {
obj.style.width = obj.offsetWidth + speed + "px";
}
}, 30);
}

}
</script>
</head>

<body>
<div id="div1">变高</div>
<div id="div2">变宽</div>
</body>
</
html>

 

运行结果:

  初始界面:

    DIV的变高与变宽

 

鼠标滑动之后界面:

  

  鼠标滑动左边:                                         鼠标滑动右边:       

    DIV的变高与变宽DIV的变高与变宽

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