<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>鼠标按下，DIV跟随移动</title>
<style>
*{
margin: 0;
padding: 0;
}
#ball{
200px;
height: 200px;
background: pink;
border-radius: 50%;
cursor: move;
position: absolute;
}
</style>
</head>
<body>
<div id="ball"></div>
</body>
<script>
//获取元素
var ball = document.getElementById('ball');
console.log(ball);
//声明全局变量
var leftCha,topCha;
//定义鼠标是否按下的标识
var isDown = false;
ball.onmousedown = function(e){
var e = e || window.event;
leftCha = e.clientX - ball.offsetLeft;
topCha = e.clientY - ball.offsetTop;
isDown = true;
}
window.onmousemove = function(e){
var e = e || window.event;
if(!isDown){
return; //终止程序执行
}
ball.style.left = e.clientX - leftCha + 'px';
ball.style.top = e.clientY - topCha + 'px';
}
ball.onmouseup = function(e){
isDown = false;
}
</script>
</html>