jquery 拖动表格 改变列宽

/* 
 * DragTable Tool dragTable.js
 * Version 1.0.0
 * Author 陈波
 * @requires jQuery v1.3.2 or later
 * @example $('#id').dragTable({limitWidth:20});
 * limitWidth:单元格最小宽度，不设置默认为1
 * table父节点css样式不要设置'width'属性
 */
;(function($) {

	$.fn.dragTable = function(options){    
		var $this = $(this);
		$this.parent().css('width',null);
 		$this.css({'width':null,'table-layout':'fixed'});
 		var currentTd=null;    
		var cookieKeyName = getFileName()+'-'+$this.attr('id');
		var limitWidth = options?options.limitWidth:1;
 		var tdWidth = getCookie(cookieKeyName);
 		var tdWidthArray = null;
 		if(null!=tdWidth && undefined!=tdWidth){tdWidthArray = tdWidth.split(',');}
 		$this.find('tr:first td').each(function(i){
			$(this).css({'cursor':'col-resize'}).attr('nowrap', true);
			$(this).css('width',null!=tdWidthArray?tdWidthArray[i]:$(this)[0].offsetWidth);
 		});
 		$this.find('tr:first td').bind('mousedown',function(event, obj){
			obj=obj||this;
			event=event||window.event;
			currentTd=obj;
			obj.mouseDownX=event.clientX;
			obj.tdW=obj.offsetWidth;
			if(obj.setCapture){ 
				obj.setCapture();
			}else if(window.captureEvents){  
				window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);   	
			}
        });
		
		$this.find('tr:first td').bind('mousemove',function(event){
			if(!currentTd) return ;
			var obj=currentTd;
			event=event||window.event;
			if(!obj.mouseDownX) return false;
			if(obj.parentNode.rowIndex==0) {
				var newWidth=obj.tdW*1+event.clientX*1-obj.mouseDownX;
			    if(newWidth>limitWidth) obj.style.width = newWidth;
			   	else obj.style.width =limitWidth;
			}
		});
		
		$this.find('tr:first td').bind('mouseup',function(){
			var widthTdTemp = [];
			$this.find('tr:first td').each(function(){
					widthTdTemp.push($(this).css('width'));
			});
			addCookie(cookieKeyName, widthTdTemp, 360);
			if(!currentTd) return;
			if(currentTd.releaseCapture){   
				currentTd.releaseCapture();   
			}else if(window.captureEvents){
            	window.releaseEvents(Event.MOUSEMOVE|Event.MOUSEUP);    
            }
            currentTd=null;
		});     
		// 获取cookie
		function getCookie(objName){
	    	var arrStr = document.cookie.split("; ");
	    	for(var i = 0;i < arrStr.length;i ++){
	     		var temp = arrStr[i].split("=");
	     		if(temp[0] == objName) return unescape(temp[1]);
	    	}
	  	}
	  	// 添加cookie
		function addCookie(name,value,expires,path,domain){
	 		var str=name+"="+escape(value);
	 		if(expires&&expires!=""){
		  		var date=new Date();
		  		date.setTime(date.getTime()+expires*24*3600*1000);//expires单位为天
		  		str+=";expires="+date.toGMTString();
	 		}
	 		if(path&&path!=""){
	  			str+=";path="+path;//指定可访问cookie的目录
	 		}
	 		if(domain&&domain!=""){
	  			str+=";domain="+domain;//指定可访问cookie的域
	 		}
	 		document.cookie=str;
		}
		// 获取引用该js文件的文件名
		function getFileName(){
			var arrUrl=window.location.href.split("/");
			return escape(arrUrl[arrUrl.length-1]);
		}
	}        
})(jQuery);