winjs模板里面定义了按钮无法使用

            <div id="lstViewMenuDetails"
                 data-win-control="WinJS.UI.ListView"
                 data-win-options="{itemTemplate: select('#mediumListIconTextTemplate'),layout: {type: WinJS.UI.GridLayout}}">
            </div>
        </div>
                    这是写在js文件里
                    (function () {
"use strict";


WinJS.UI.Pages.define("/pages/Review.html", {
    // This function is called whenever a user navigates to this page. It
    // populates the page elements with the app's data.
    ready: function (element, options) {
        // TODO: Initialize the page here.
        document.getElementById("cmdAdd").addEventListener("click", function () {
            var sum = total.innerText;
            sum++;
            total.innerText = sum;
        })
    }
            新人学winjs求大神解答