javascript - 视图显示不正确

Question

当我alert()在render函数内使用时UserListView，输出正确显示。如果我发表评论alert()，则不会显示该视图。

我坚持这一点。这是为什么？

这是代码：

var User = Backbone.Model.extend({
    defaults: {}
});

var UserCollection = Backbone.Collection.extend({
    model: User,
    url: 'http://localhost/cirest/index.php/api/userapi/users'
});

var UserView = Backbone.View.extend({
    tagName: 'thumbnail',
    className: 'span12',
    template: $('#userdetailtemplate').html(),
    render: function () {
        var tmpl = _.template(this.template);
        this.$el.html(tmpl(this.model.toJSON()));
        return this;
    }
});

var UserListView = Backbone.View.extend({
    el: ('#content1'),

    initialize: function () {        
        this.collection = new UserCollection();
        this.collection.fetch();

        this.render();
    },

    render: function () {
        var that = this;

        alert('asdf');

        _.each(this.collection.models, function (item) {
            that.renderUser(item);
        }, this);

    },

    renderUser: function (item) {
        var userview = new UserView({
            model: item
        });

        this.$el.append(userview.render().el);
    }
});

$(function () {
    var uview = new UserListView();
});

网页：

<div id="content1" class="span12"></div>
<script type="text/template" id="userdetailtemplate">
    <%= user_name %> <%= user_email %>
</script>

Answer 1

我通过将 UserListView 中的初始化函数更改为

initialize: function() {
        this.collection = new UserCollection();
        this.collection.fetch();
        this.collection.on("reset", this.render, this);
        this.render();
    },

感谢@nikoshr 也提到了那个链接