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<!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>拖拽</title>
<style>
#ball {
width: 50px;
height: 50px;
background-color: lightpink;
border-radius: 50%;
box-shadow: 2px 2px 1px #888;
position: absolute;
}
</style>
</head>
<body>
<div id="ball"></div>
<script>
// onmousedown: 选择, onmouseover: 移动, onmouseup:放下
//找到小球的位置:
// 当前鼠标到小球边沿的距离相对是不变的,变得只是小球到左边与顶部的距离
// 这个不变的距离 ,是鼠标点击下去的一瞬间就确定了,就可以求出来了
// 根据当前鼠标到当前可视区的距离
// 求出鼠标当前位置
var ball = document.getElementById('ball');
ball.onmousedown = function(event) {
var x = event.clientX - this.offsetLeft;
var y = event.clientY - this.offsetTop;
// console.log(x,y);
document.onmousemove = function(event) {
ball.style.left = event.clientX - x + 'px';
ball.style.top = event.clientY - y + 'px';
}
document.onmouseup=function(){
document.onmousemove=null;
}
}
</script>
</body>
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