在我的部分视图中没有任何价值出现在淘汰赛中

var baseUri = '@ViewBag.ApiUrl';
var viewmodel = function () {
    var self = this;
    self.VoucherDetails = ko.observableArray([]);
    $.getJSON(baseUri, this.VoucherDetails);
    alert(self.VoucherDetails);
};


<table>
    <tbody data-bind='foreach: VoucherDetails'>
        <tr>
            <td data-bind="text : $data.empcode">
                <span data-bind=" text : $data.empcode"></span> test
            </td>
            <td data-bind=" text : empcode">
                <span data-bind=" text : empcode"></span>
            </td>

        </tr>
    </tbody>
</table>
var baseUri = '@ViewBag.ApiUrl';
var viewmodel