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<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style> #div1{ width:100px; height:100px; background:red; position:absolute;} #div2{ width:100px; height:100px; background:yellow; position:absolute; left:100px;} #div3{ width:100px; height:100px; background:blue; position:absolute; left:200px;} #div4{ width:100px; height:100px; background:green; position:absolute; left:300px;} </style> <script> //组件开发 : 多组对象,像兄弟之间的关系( 代码复用的一种形式 ) window.onload = function(){ var d1 = new Drag(); d1.init({ //配置参数 id : ‘div1‘ }); var d2 = new Drag(); d2.init({ //配置参数 id : ‘div2‘, toDown : function(){ document.title = ‘hello‘; } }); var d3 = new Drag(); d3.init({ //配置参数 id : ‘div3‘, toDown : function(){ document.title = ‘妙味‘; }, toUp : function(){ document.title = ‘课堂‘; } }); var d4 = new Drag(); d4.init({ //配置参数 id : ‘div4‘, toUp : function(){ document.title = ‘beybye‘; } }); }; function Drag(){ this.obj = null; this.disX = 0; this.disY = 0; this.settings = { //默认参数 toDown : function(){}, toUp : function(){} }; } Drag.prototype.init = function(opt){ var This = this; this.obj = document.getElementById(opt.id); extend( this.settings , opt ); this.obj.onmousedown = function(ev){ var ev = ev || window.event; This.fnDown(ev); This.settings.toDown(); document.onmousemove = function(ev){ var ev = ev || window.event; This.fnMove(ev); }; document.onmouseup = function(){ This.fnUp(); This.settings.toUp(); }; return false; }; }; Drag.prototype.fnDown = function(ev){ this.disX = ev.clientX - this.obj.offsetLeft; this.disY = ev.clientY - this.obj.offsetTop; }; Drag.prototype.fnMove = function(ev){ this.obj.style.left = ev.clientX - this.disX + ‘px‘; this.obj.style.top = ev.clientY - this.disY + ‘px‘; }; Drag.prototype.fnUp = function(){ document.onmousemove = null; document.onmouseup = null; }; function extend(obj1,obj2){ for(var attr in obj2){ obj1[attr] = obj2[attr]; } } </script> </head> <body> <div id="div1"></div> <div id="div2"></div> <div id="div3"></div> <div id="div4"></div> </body> </html>
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原文地址:http://www.cnblogs.com/liujin0505/p/4376606.html