<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.wrapper {
background-color: pink;
position: absolute;
top: 0;
left: 0;
}
</style>
</head>
<body>
<div class="wrapper">
</div>
</body>
<script>
var wrapper = document.getElementsByClassName('wrapper')[0]；
var downX,
downY,
moveX,
moveY,
distanceX,
distanceY,
zChange = false;
//左键点击事件
window.addEventListener('mousedown', down);
function down(e) {
var event = e || window.event
//点下点的坐标
downX = event.clientX;
downY = event.clientY;
//当move开关
zChange = true;
}
//鼠标移动事件
window.addEventListener('mousemove', move)
function move(e) {
var event = e || window.event
if (zChange) {
//移动市光标的坐标
moveX = event.clientX;
moveY = event.clientY;
//盒子的定位属性
wrapper.style.left = Math.min(moveX, downX) + 'px';
wrapper.style.top = Math.min(moveY, downY) + 'px';
//盒子的宽高
wrapper.style.width = Math.abs(moveX - downX) + 'px';
wrapper.style.height = Math.abs(moveY - downY) + 'px';
}
}
//鼠标抬起事件
window.addEventListener('mouseup', up);
function up() {
zChange = false;
wrapper.style.cssText = '';
}
</script>
</html>
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