jquery live动态绑定toggle

//选择|取消用户
   $('.u_choose li').live('click',function(){
    $(this).toggle(function(){
     var openid  = $(this).attr('id');
     var username = $(this).text();
     var obj = {openid:openid, username:username};
     chooseUser(obj);
     },
     function(){
      var openid  = $(this).attr('id');
      var username = $(this).text();
      var obj = {openid:openid, username:username};
      cancelUser(obj);
     }
    );
    $(this).trigger('click');
   });