<!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>
#box{
position: absolute;
width: 200px;
height: 200px;
background: red;
}
</style>
<script>
window.onload=function(){
var drag=new Drag("box")
drag.init();
}
//构造函数Drag
function Drag(id){
this.obj=document.getElementById(id);
this.disX=0;
this.disY=0;
}
Drag.prototype.init = function (){
var me = this;
this.obj.onmousedown = function (e){
var e = e || event;
me.mouseDown(e);
// 阻止默认事件
return false;
};
};
Drag.prototype.mouseDown=function(e){
var me=this;
this.disX = e.clientX - this.obj.offsetLeft;
this.disY = e.clientY - this.obj.offsetTop;
document.onmousemove=function(e){
var e=e||window.event;
me.mouseMove(e);
};
document.onmouseup = function (){
me.mouseUp();
}
}
Drag.prototype.mouseMove = function (e){
this.obj.style.left = (e.clientX - this.disX) + ‘px‘;
this.obj.style.top = (e.clientY - this.disY) + ‘px‘;
};
Drag.prototype.mouseUp = function (){
document.onmousemove = null; //如果不卸载这个事件的话，鼠标抬起后，移动鼠标，div依然会移动。
document.onmouseup = null;
};
时间： 2024-10-09 18:28:32