这个案例是当你的鼠标按压下去后，div跟着你的鼠标移动而移动，当你的鼠标抬起后，div不随着鼠标移动而移动。类似于电脑移动应用图标的感觉。
代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>div移动</title>
<style>
*{
margin: 0;
padding: 0;
}
div{
width: 100px;
height: 100px;
background-color: aqua;
position: absolute;
}
</style>
</head>
<body>
<div>
</div>
<script>
let div1 = document.querySelector('div')
w = parseInt(getComputedStyle(div1).width)
h = parseInt(getComputedStyle(div1).height)
div1.onmousedown = function(event){
div1.onmousemove = function(event1){
div1.style.left = (event1.pageX-w/2) + 'px'
div1.style.top = (event1.pageY-h/2) + 'px'
}
}
div1.onmouseup = function(){
// 解除DOM0事件绑定
div1.onmousemove = null
div1.onmousedown = null
}
</script>
</body>
</html>结果
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