Javascript 主干集合视图url触发两次

因此，我下面的应用程序在加载页面时，实际上在控制台中触发了两次“FIRE！”。我不知道为什么主干网会两次启动url函数，而我只看到一次抓取。你知道为什么这会导致它两次开火吗

    window.ScheduleApp = {
        Models: {},
        Collections: {},
        Views: {}
    };

    window.template = function(id) {
        return _.template($('#' + id).html());
    };

    //Define the Game Model.
    ScheduleApp.Game = Backbone.Model.extend({
        initialize: function() {
            this.gameId = this.get('Id');
            this.gameTime = this.get('Time');
        }
    });

    //Define the Games Collection that contains Game Models.
    ScheduleApp.Games = Backbone.Collection.extend({
        model: ScheduleApp.Game
    });

    //Define the Day Model.
    ScheduleApp.Day = Backbone.Model.extend({
        initialize: function() {
            this.games = new ScheduleApp.Games(this.get('Games'));
            this.games.parent = this;
            this.gameDayGDT = this.get('GeneratedDateTime');
            this.gameDayDate = this.get('Date');
        }
    });

    //Define the Days Collection that contains the Day Models.
    ScheduleApp.Days = Backbone.Collection.extend({
        model: ScheduleApp.Day,
        url: function() {
            console.log('FIRE!');
            return '/js/test.json'
        },
        parse: function(data) {
            var parsedSchedule = JSON.parse('[' + data.STUFF + ']');
            return parsedSchedule;

        }

    });

    ScheduleApp.DayCollectionView = Backbone.View.extend({
        el: '.container', //Container where the views get rendered to.

        initialize: function() {
            this.listenTo(this.collection, 'reset', this.render);
        },
        render: function(event) {

            if (this.collection.length === 0) {
                $('.container-hidden').show();
            }

            //Cycle through collection of each day.
            this.collection.each(function(day) {

                var dayView = new ScheduleApp.DayView({
                    model: day
                });

                this.$el.append(dayView.render().el);

            }, this);
            return this;
        }
    });

    ScheduleApp.DayView = Backbone.View.extend({
        tagName: 'div', 
        className: 'game-date', 
        template: _.template($("#gameSchedule").html(), this.model),
        initialize: function() {
            this.listenTo(this.model, "reset", this.render);
        },
        render: function() {
            this.$el.html(this.template(this.model.toJSON()));
            return this;
        }
    });


    var daysList = new ScheduleApp.Days();

    daysList.fetch({
        reset: true,
        update: true,
        cache: false,
        success: function(collection, response) {
            //console.log(collection);
        },
        error: function(model, resp) {
            // console.log('error arguments: ', arguments);
            // console.log("error retrieving model");
        }

    });

    //create new collection view.
    var daysCollectionView = new ScheduleApp.DayCollectionView({
        collection: daysList
    });

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如前所述，属于集合的所有模型都基于集合URL构建其URL。我猜您的集合只调用了一次该方法，然后您的模型进行第二次调用，以便构建模型URL

---

再说一次，这个方法对我来说似乎是无害的：它只是一个getter。我宁愿将

console.log

调用放在

Collection\parse

或

Model\initializer

方法中，并计算它在那里被调用的次数。

您可以通过替换

console.log（'FIRE！'）得到更好的主意带有
console.log（新错误（）.stack）似乎集合#parse被触发一次。那么你是说url被触发两次是无害的吗？无害的意思是该方法只返回一个字符串（实际上可以将其设置为变量，不需要函数）。第二次调用的原因可能是模型构建了自己的URL，正如我在主干文档中指出的那样。