如题。因为希望自定义的Checkbox的errorplacement在其它位置，所以Javascript里面做了个判断，但后来发现所有的attr("name")的值均为undefined，百思不得其解，盼请各位前辈高手之间，不胜感激！！

                <form class="FT_form" id="frm1" name="frm1" method="post">

                        <li>

                            <label for="lbl_cname">* 客户姓名（必填）：</label>

                            <input type="text" id="txt_cname" name="txt_cname">

                        </li>

                        <li>

                            <label for="lbl_ctel">* 客户联系电话（必填）：</label>

                            <input type="text" id="txt_ctel" name="txt_ctel">

                            <!--<label for="txt_cname"></label>-->

                        </li>        

                        <li>

                            <label for="lbl_cMRN">  MRN编号（选填）：</label>

                            <input type="text" id="txt_cMRN" name="txt_cMRN">

                            <!--<label for="txt_cMRN"></label>-->

                        </li>



                        <li>

                        	<label for="lbl_action">* 房间登记类别（必选）：</label>

         					<div class="cltype_chk">

    							<input type="checkbox" checked="" id="chk_type" value="2" name="chk_type" style="width:20px;">

                                <label for="chk_ordered" class="chk_lbl">预定</label>

								<input type="checkbox" id="chk_type" value="3" name="chk_type" style="width:20px;">

                                <label for="chk_in" id="chk_in1" class="chk_lbl">入住</label>

    						</div>

                            <div id="error_action" >error:</div>

                        </li>                  



           </form>

<script src="jquery-ui-1.9.2.custom/js/jquery-1.8.3.js"></script>

<script src="jquery-ui-1.9.2.custom/js/jquery-ui-1.9.2.custom.min.js"></script>

<script src="jquery-ui-1.9.2.custom/development-bundle/ui/jquery.ui.datepicker.js"></script>

<script src="jquery/dist/jquery.validate.js"></script>

<script src="jquery/dist/jquery.validate.min.js"></script>

<script src="jquery/dist/localization/messages_zh.js"></script>

<script src="jquery/jquery_validate_extended.js"></script>



<script>

	$("#frm1").validate({

		errorElement:'span',



		rules:	{

			slt_rnum: {required:true},

			txt_cname: {required:true, maxlength:30},

			txt_ctel: {required: true, isMobile: true},

			chk_type: {required: true}

		},

		messages: {

			slt_rnum: {required:"请选择房型和房号!"},

			txt_cname: {required:"客户姓名不能为空", maxlength: "姓名不能超过30字符"},

			txt_ctel: {required: "客户手机号为必填项！", isMobile:"手机号码应为11位数字！"},

			chk_type: {required:"AAA"}

		},

		

		   errorPlacement: function(error, element) {

		   if (error.attr("name")=="chk_type")

		   		{//alert("aaa");

				error.appendTo("#error_action");}

		   else

                                                                {error.appendTo(element.parent());

		                                   alert(element.attr('tagname'));}

   		},

	}) ;

</script>