js控制div的拖拽和拉伸

通过控制div的left和top，来让随意拖拽和拉伸，听上去是不是很好玩呢，接下来就跟随我的脚步来了解一下吧，web前端技术

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Author" content="FengYu">
<title>爱前端博客</title>
<style>
*{margin:0;padding:0;font-family: Microsoft YaHei,serif;}
li{list-style: none;}
#box{
position: absolute;
top:100px;
left:100px;
width:100px;
height: 100px;
background: pink;
}
#sbox{
position: absolute;
bottom:0;
right:0;
width:5px;
height: 5px;
background: red;

}
</style>

</head>
<body>
<div id="box">
<div id="sbox"></div>
</div>
<script>

box.onmousedown=function (e) {
e=e||window.event;
var xDown = e.clientX,//获取鼠标的初始坐标
yDown = e.clientY,//获取鼠标的初始坐标
leftDown = this.offsetLeft,
topDown = this.offsetTop;
box.style.cursor = "pointer"

document.onmousemove=function (e) {
e = e||window.event;
var xMove = e.clientX,
yMove = e.clientY;
box.style.left = leftDown + xMove - xDown + "px";
box.style.top =topDown + yMove - yDown + "px";

}
};

document.onmouseup=function () {
box.style.cursor = "default";
document.body.style.cursor = "default";
this.onmousemove=null;
}

sbox.onmousedown=function (e) {
e = e||window.event;
e.cancelBubble=true;
var xDown = e.clientX,
yDown = e.clientY,
boxW = box.clientWidth,
boxH = box.clientHeight;
document.body.style.cursor = "se-resize";
document.onmousemove=function (e) {
e = e||window.event;
var xMove = e.clientX,
yMove = e.clientY,
x_ = xMove - xDown, //x变化量
y_ = yMove - yDown, // y变化量
width = Math.max(10,x_+boxW),
height = Math.max(10,y_+boxH);
box.style.width = width + "px";
box.style.height = height + "px";
}
}

</script>
</body>
</html>

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