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js通過八個點 拖動改變div大小的實現方法

 本篇文章主要是對js通過八個點 拖動改變div大小的實現方法進行了介紹,需要的朋友可以過來參考下,希望對大家有所幫助

 代碼如下: <html>  <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; //記錄觸發什麼事件的索引          this.original = []; //記錄開始狀態的數組          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(thi s.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:funct
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