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);