asp.net-mvc – 在不显眼的验证过程中使用parseJSON的语法错误

<form action="/UrIntake/Save" id="UrIntakeForm" method="post">

    <input data-val="true" data-val-length="The field LastName must be a string with a maximum length of 50." data-val-length-max="50" data-val-required="The LastName field is required." id="FormSubmitter_LastName" name="FormSubmitter.LastName" type="text" value="" />
    <input data-val="true" data-val-length="The field FirstName must be a string with a maximum length of 50." data-val-length-max="50" data-val-required="The FirstName field is required." id="FormSubmitter_FirstName" name="FormSubmitter.FirstName" type="text" value="" />

    <div id="SubmissionButtons" class="right">
            <input type="button" onclick="SubmitForm()" value="Submit" />
            <input type="button" onclick="CancelForm()" value="Cancel" />
    </div>
</form>

    function SubmitForm() {
        $("#UrIntakeForm").valid();
.
.
.

这是发生语法错误的jQuery代码(v1.9.0). “data”未定义,“return”行是发生错误的地方：

parseJSON: function( data ) {
    // Attempt to parse using the native JSON parser first
    if ( window.JSON && window.JSON.parse ) {
        return window.JSON.parse( data );
    }

大概我不必在文本框中输入任何东西(应该会得到“必填字段”).这是什么导致错误？这没有意义,但我看不出还有什么可以做的.