js实现的八点拖动修改div大小的代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Resize</title> <style type="text/css"> #rRightDown,#rLeftDown,#rLeftUp,#rRightUp,#rRight,#rLeft,#rUp,#rDown{ position:absolute;background:#C00;width:6px;height:6px;z-index:5;font-size:0;} #rLeftDown,#rRightUp{cursor:ne-resize;} #rRightDown,#rLeftUp{cursor:nw-resize;} #rRight,#rLeft{cursor:e-resize;} #rUp,#rDown{cursor:n-resize;} #rRightDown{ bottom:-3px; right:-3px;} #rLeftDown{ bottom:-3px; left:-3px;} #rRightUp{ top:-3px; right:-3px;} #rLeftUp{ top:-3px; left:-3px;} #rRight{ right:-3px; top:50%} #rLeft{ left:-3px; top:50%} #rUp{ top:-3px; left:50%} #rDown{ bottom:-3px; left:50%} </style> </head> <body> <div id='ss' style="height:100px; width:100px; border:1px solid #000000; position:absolute; left:200px; top:200px;" > <div id="rRightDown"> </div> <div id="rLeftDown"> </div> <div id="rRightUp"> </div> <div id="rLeftUp"> </div> <div id="rRight"> </div> <div id="rLeft"> </div> <div id="rUp"> </div> <div id="rDown"></div> </div> <script> var Sys = (function(ua){     var s = {};     s.IE = ua.match(/msie ([\d.]+)/)?true:false;     s.Firefox = ua.match(/firefox\/([\d.]+)/)?true:false;     s.Chrome = ua.match(/chrome\/([\d.]+)/)?true:false;     s.IE6 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 6))?true:false;     s.IE7 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 7))?true:false;     s.IE8 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 8))?true:false;     return s; })(navigator.userAgent.toLowerCase()); var $ = function (id) {     return document.getElementById(id); }; var Css = function(e,o){     for(var i in o)     e.style[i] = o[i]; }; var Extend = function(destination, source) {     for (var property in source) {         destination[property] = source[property];     } }; var Bind = function(object, fun) {     var args = Array.prototype.slice.call(arguments).slice(2);     return function() {         return fun.apply(object, args);     } }; var BindAsEventListener = function(object, fun) {     var args = Array.prototype.slice.call(arguments).slice(2);     return function(event) {         return fun.apply(object, [event || window.event].concat(args));     } }; var CurrentStyle = function(element){     return element.currentStyle || document.defaultView.getComputedStyle(element, null); }; function addListener(element,e,fn){     element.addEventListener?element.addEventListener(e,fn,false):element.attachEvent("on" + e,fn); }; function removeListener(element,e,fn){     element.removeEventListener?element.removeEventListener(e,fn,false):element.detachEvent("on" + e,fn) }; var Class = function(properties){     var _class = function(){return (arguments[0] !== null && this.initialize && typeof(this.initialize) == 'function') ? this.initialize.apply(this, arguments) : this;};     _class.prototype = properties;     return _class; }; var Resize =new Class({     initialize : function(obj){         this.obj = obj;         this.resizeelm = null;         this.fun = null; //记录触发什么事件的索引         this.original = []; //记录开始状态的数组         this.width = null;         this.height = null;         this.fR = BindAsEventListener(this,this.resize);         this.fS = Bind(this,this.stop);         },     set : function(elm,direction){         if(!elm)return;         this.resizeelm = elm;         addListener(this.resizeelm,'mousedown',BindAsEventListener(this, this.start, this[direction]));         return this;     },     start : function(e,fun){         this.fun = fun;         this.original = [parseInt(CurrentStyle(this.obj).width),parseInt(CurrentStyle(this.obj).height),parseInt(CurrentStyle(this.obj).left),parseInt(CurrentStyle(this.obj).top)];         this.width = (this.original[2]||0) + this.original[0];         this.height = (this.original[3]||0) + this.original[1];         addListener(document,"mousemove",this.fR);         addListener(document,'mouseup',this.fS);     },     resize : function(e){         this.fun(e);         Sys.IE?(this.resizeelm.onlosecapture=function(){this.fS()}):(this.resizeelm.onblur=function(){this.fS()})     },     stop : function(){         removeListener(document, "mousemove", this.fR);         removeListener(document, "mousemove", this.fS);         window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();         },     up : function(e){         this.height>e.clientY?Css(this.obj,{top:e.clientY + "px",height:this.height-e.clientY + "px"}):this.turnDown(e);     },     down : function(e){         e.clientY>this.original[3]?Css(this.obj,{top:this.original[3]+'px',height:e.clientY-this.original[3]+'px'}):this.turnUp(e);         },     left : function(e){         e.clientX<this.width?Css(this.obj,{left:e.clientX +'px',width:this.width-e.clientX + "px"}):this.turnRight(e);             },     right : function(e){         e.clientX>this.original[2]?Css(this.obj,{left:this.original[2]+'px',width:e.clientX-this.original[2]+"px"}):this.turnLeft(e)    ;     },     leftUp:function(e){         this.up(e);this.left(e);     },     leftDown:function(e){         this.left(e);this.down(e);     },     rightUp:function(e){         this.up(e);this.right(e);     },     rightDown:function(e){         this.right(e);this.down(e);     },                     turnDown : function(e){         Css(this.obj,{top:this.height+'px',height:e.clientY - this.height + 'px'});     },     turnUp : function(e){         Css(this.obj,{top : e.clientY +'px',height : this.original[3] - e.clientY +'px'});     },     turnRight : function(e){         Css(this.obj,{left:this.width+'px',width:e.clientX- this.width +'px'});     },     turnLeft : function(e){         Css(this.obj,{left:e.clientX +'px',width:this.original[2]-e.clientX+'px'});              }         }); window.onload = function(){     new Resize($('ss')).set($('rUp'),'up').set($('rDown'),'down').set($('rLeft'),'left').set($('rRight'),'right').set($('rLeftUp'),'leftUp').set($('rLeftDown'),'leftDown').set($('rRightDown'),'rightDown').set($('rRightUp'),'rightUp'); } </script> </body> </html>

[Ctrl+A 全选注:引入外部Js需再刷新一下页面才能执行]

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js实现的八点拖动修改div大小的代码

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