Javascript 车把-显示来自本地存储器的数据

我创建了一个简单的crud应用程序，它使用localstorage来保存和检索对象。现在我想用handlebar.JS替换连接JS+HTML的丑陋函数。我在HTML模板中显示来自本地存储的数据时遇到问题-我必须编写自定义Handlebar helper，还是有一个简单的解决方案

这是我的密码

HTML部分

 <div id="output"></div>
  <script id="tpl" type="text/x-handlebars-template">
    {{#each itemData}}
      {{name}}
    {{/each}}
  </script>

---

此代码运行良好。

检查您的应用程序上下文，并在需要时替换。。在for循环中，你有这个.items还是app.items？！app.items检索良好的数据

var app = {
    data: [],
    init: function () {
        this.cacheDom();
        this.bindEvents();
        this.render();
    },
    render: function () {
        app.getFromLocalStorage();
        var itemData = app.items;
        var source = document.getElementById("tpl").innerHTML;
        var template = Handlebars.compile(source);
        document.getElementById("output").innerHTML = template(itemData);
    },
    cacheDom: function () {
        this.list = document.getElementById("list");
        this.addInput = document.getElementById("addInput");
        this.addBtn = document.getElementById("addBtn");
        this.document = $(document);
    },
    bindEvents: function () {
        this.addBtn.addEventListener("click", app.addItem);
        this.document.on("change", ".itemSelect", function (e) {
            if (this.value === "erase") {
                app.deleteItem(e);
            } else if (this.value === "edit") {
                app.editItem(e);
            }
        });
    },
    saveToLocalStorage: function () {
        localStorage.setItem("app.items", JSON.stringify(app.items));
    },
    getFromLocalStorage: function () {
        var retrievedObject = localStorage.getItem("app.items");
        app.items = retrievedObject;
    },
    displayItem: function () {
        app.getFromLocalStorage();
        var data = "";
        //put into handlebars
        for (var i in this.items) {
            var optionValue =
                '<select class="itemSelect">' +
                '<option hidden value="unchosen">Options</option>' +
                '<option value="edit">Edit</option>' +
                '<option value="erase">Erase</option>' +
                '</select></li></span>';
            //nadaj kolejno id
            data += '<li class="listItem"><span id=' + i + ">" + app.items[i].name + optionValue;
        }
        app.list.innerHTML = data;
    },

    editItem: function (e) {
        app.getFromLocalStorage();
        var tableItemNumber = e.target.parentNode.id;
        var editItemValue = prompt("Edytuj");
        if (editItemValue.length === 0) {
            alert("Formularz jest pusty");
        }
        app.items[tableItemNumber].name = editItemValue;
        app.saveToLocalStorage();
        app.displayItem();
    },

};

app.init();

displayItem: function () {
      app.getFromLocalStorage();
      var data = "";

      var source = document.getElementById("tpl").innerHTML;
      var template = Handlebars.compile(source);
      //below most important part 
      var html = template(app);
      document.getElementById("output").innerHTML = html;
}