JQuery的全选，全不选，反选！

<! 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 >
     < title ></ title >
     < link  rel ="stylesheet"  type ="text/css"  href ="Css/Commom.css"   />
     < script  src ="Scripts/jquery-1.4.1.js"  type ="text/javascript" ></ script >
     < script  language ="javascript"  type ="text/javascript" >

        $( function  () {
            $( " #selAll " ).click( function  () {
                $( " .column :checkbox " ).attr( " checked " ,  true );
            });

            $( " #unSelAll " ).click( function  () {
                $( " .column :checkbox " ).attr( " checked " ,  false );
            });

            $( " #reverSel " ).click( function  () {
                 // 遍历.column 下的 checkbox;
                $( " .column :checkbox " ).each( function  () {
                     // 给当前勾选的checkbox取反；  其中!$(this).attr("checked")是先获取他的属性，再取反，充当第二个参数；
                     // attr方法只有一个参数时是取值，两个参数时是设值；
                    $( this ).attr( " checked " ,  ! $( this ).attr( " checked " ));
                });
            });
        });

     </ script >
</ head >
< body >
     < div  class ="column" >
         < input  id ="Checkbox1"  type ="checkbox"  value ="修改密码"   />
        修改密码
         < input  id ="Checkbox2"  type ="checkbox"  value ="评论管理"   />
        评论管理
         < input  id ="Checkbox3"  type ="checkbox"  value ="删除文章"   />
        删除文章
         < input  id ="Checkbox4"  type ="checkbox"  value ="删除用户"   />
        删除用户
         < input  id ="Checkbox5"  type ="checkbox"  value ="备份数据"   />
        备份数据
     </ div >
     < div  class ="column" >
         < input  id ="selAll"  type ="button"  value ="全选"   />
         < input  id ="unSelAll"  type ="button"  value ="全不选"   />
         < input  id ="reverSel"  type ="button"  value ="反选"   />
     </ div >
</ body >
</ html >