jquery 验证用户名是否重复代码实例

$("#form-admin-add").validate({		rules:{			userName:{				required:true,				minlength:2,				maxlength:16,				remote: {     type: "post",     url: "/checkUserName.html",     data: {      userName: function() {       return $("#userName").val();      }     },     dataType: "html",     dataFilter: function(data, type) {     var data=JSON.parse(data)      if (data.status ==400)       return false;      else       return true;     }    }			},			password:{				required:true,			},			password2:{				required:true,				equalTo: "#password"			},			sex:{				required:true,			},			phone:{				required:true,				isPhone:true,			},			email:{				required:true,				email:true,			},			roleId:{				required:true,			},		},		success: function(label) {   //正确时的样式   label.text(" ").addClass("success");  },   messages: {   userName: {    required: "请输入用户名，3-16个字符（字母、数字、下划线），注册后不能更改",    minlength: "用户名长度不能小于3个字符",    maxlength: "用户名长度不能大于16个字符",    remote: "用户名不可用"   }  },		onkeyup:false,		focusCleanup:true,		success:"valid"	});