为什么这个函数返回NaN

一开始，这可能与JavaScript中关于NaN的许多其他问题一样，但我向您保证不是。

我有一段代码，它转换从文本框中获取值，并在点击表单中的按钮后将其转换为日期：

var dateString = $('#itemAcquiredTxt').val(); //Would have a value of '2013-12-15'
var dateAcquired = new Date(dateString); //Invalid Date ?

文本框项AcquiredTxt的值为"2013-12-15"（YYYY-MM-DD格式），取自数据库调用：

$('#itemAcquiredTxt').val(new Date(item.DateAcquired).toLocaleDateString());

创建新的Date对象后，它会给我"无效日期"。

好的。。。所以我想通过将年、月和日作为数字传递给Date对象，这是它的其他构造函数之一。

 var year = Number(dateString.split("-")[0]); //Returns NaN
 var month = Number(dateString.split("-")[1]); //Returns NaN
 var day = Number(dateString.split("-")[2]); //Returns NaN
 var dateAcquired = new Date(year, month - 1, day); //InvalidDate

我试着用破折号将日期文本框中的字符串拆分，并使用number和parseInt将字符串转换为数字，但两者都给了我一个NaN。我仔细检查了字符串值，似乎没有任何错误：拆分项上分别为"2013"、"12"answers"15"。

我对自己说。。。也许我的代码不好，并在JSFiddle上尝试过https://jsfiddle.net/jrxg40js/
但正如你在那里看到的，在文本中输入日期并按下按钮后，它就起作用了！

以下是相关的HTML代码

<table id="inputTable">
            <tr>
                <td><span><strong>Name:</strong></span></td>
                <td><input id="itemNameTxt" type="text" value="" /></td>
            </tr>
            <tr>
                <td><span><strong>Category:</strong></span></td>
                <td>
                    <select id="categorySelect" ng-model="selectedCategory" ng-change="changeSubCategoryList(selectedCategory)" ng-options="cat as cat.CategoryName for cat in categoriesObj track by cat.CategoryID">
                        <option value="">---Please Select One---</option>
                    </select>
                </td>
            </tr>
            <tr ng-show="hasSubCat">
                <td><span><strong>Sub Category</strong></span></td>
                <td>
                    <select id="subCategorySelect">
                        <option value="">---Please Select One---</option>
                        <option ng-repeat="sub in subCategoryObj" value="{{sub.SubCatID}}">{{sub.SubCatName}}</option>
                    </select>
                </td>
            </tr>
            <tr>
                <td><span><strong>Description:</strong></span></td>
                <td><input id="itemDescriptionTxt" type="text" value="" /></td>
            </tr>
            <tr>
                <td><span><strong>Serial Number:</strong></span></td>
                <td><input id="itemSerialNumberTxt" type="text" value="" /></td>
            </tr>
            <tr>
                <td><span><strong>Year:</strong></span></td>
                <td><input id="itemYearTxt" type="text" value="" /></td>
            </tr>
            <tr>
                <td><span><strong>Initial Cost:</strong></span></td>
                <td><input id="itemValueTxt" type="text" value="" /></td>
            </tr>
            <tr>
                <td><span><strong>Department:</strong></span></td>
                <td>
                    <select id="departmentSelect">
                        <option value="">---Please Select One---</option>
                        <option ng-repeat="dep in departmentsObj" value="{{dep.RoleID}}">{{dep.RoleDescription}}</option>
                    </select>
                </td>
            </tr>
            <tr>
                <td><span><strong>Campus:</strong></span></td>
                <td>
                    <select id="campusSelect" ng-model="selectedCampus" ng-change="changeBuildingList(selectedCampus)" ng-options="campus as campus.CampusDescription for campus in campusesObj track by campus.CampusID">
                        <option value="">---Please Select One---</option>
                    </select>
                </td>
            </tr>
            <tr>
                <td><span><strong>Building:</strong></span></td>
                <td>
                    <select id="buildingSelect">
                        <option value=""> </option>
                        <option ng-repeat="building in buildingsObj" value="{{building.BuildingID}}">{{building.BuildingDescription}}</option>
                    </select>
                </td>
            </tr>
            <tr>
                <td><span><strong>Date Acquired:</strong></span></td>
                <td><input id="itemAcquiredTxt" type="text" value="" /></td>
            </tr>
            <tr>
                <td><span><strong>Notes:</strong></span></td>
                <td>
                    <textarea id="noteTxt"></textarea>
                </td>
            </tr>
        </table>

相关AngularJS函数，用于用用户键入的新数据更新项目-当用户按下确认按钮时调用该函数：

$scope.editItem = function () {
    var dateString = $('#itemAcquiredTxt').val();
    dateAcquired = new Date(dateString);
    var invItem = {
        ItemID: $('#itemID').val(),
        ItemName: $('#itemNameTxt').val().trim(),
        CategoryID: $('#categorySelect').find(":selected").val(),
        SubCategoryID: $('#subCategorySelect').find(":selected").val(),
        Description: $('#itemDescriptionTxt').val().trim(),
        SerialNumber: $('#itemSerialNumberTxt').val().trim(),
        Year: $('#itemYearTxt').val().trim(),
        DateAcquired: dateAcquired,
        Value: $('#itemValueTxt').val().trim(),
        RoleID: $('#departmentSelect').find(":selected").val(),
        Barcode: null,
        Notes: $('#noteTxt').val().trim(),
        Deleted: null,
        AddedBy: null,
        DateAdded: null,
        ModifiedBy: null, //Added by server
        DateModified: null,
        DeletedBy: '',
        DateDeleted: null,
        CampusID: $('#campusSelect').find(":selected").val(),
        BuildingID: $('#buildingSelect').find(":selected").val(),
        RoomID: null
    };
    $http.put("api/inventory/", invItem).success(function (data, status, headers, config) {
        inventoryData.retrieveData(); //On success, refresh zeh data
    }).error(function (data, status, headers, config) {
        console.log(data);
    });
    $("#dialogForm").dialog("close");

为什么我的代码在我的工作环境中返回NaN（Visual Studio 2015在IE11上调试），而其他站点（如JSFiddle）正在返回我期望的结果？