Question

我正在尝试将我用raphael.js创建的这个简单项目转换为使用backbone.js，但我仍然遇到同样的错误，我不知道为什么。在我的模型中的函数中，我尝试使用“this”访问变量，但我仍然得到此错误'无法读取未定义的属性'长度'，例如使用数组。我的模型看起来像这样：

GameModel = Backbone.Model.extend({
        defaults: {

            spawnId: '',
            gameloopId: '',
            checkId: '',
            goingUp: false,
            counter: 0,     
            recentscores: [],
            enemies: '',
            speed: -4,
            score: 0,
            health: 100,
            paper: '',
            t: '',
            h: '',
            c: '',
            circle: ''

        },
        initialize: function(){

            this.enemies = [];
            this.paper = new Raphael($('#canvas'), 0, 0);
            this.circle = this.paper.circle(100, 50, 30);
            this.t = this.paper.text(1000, 50, "Score: " + this.score);
            this.h = this.paper.text(50, 50, "Health: " + this.health);
            this.c = this.paper.image("background.png", 0, 0, 2400, 800);
            this.paper.setSize(1200,800);
            this.circle.attr({fill: '#9cf', stroke: '#ddd', 'stroke-width': 5});
            this.t.attr({ "font-size": 20, "font-family": "Arial, Helvetica, sans-serif" });
            this.h.attr({ "font-size": 20, "font-family": "Arial, Helvetica, sans-serif" });
        },

Answer 1

要做到这一点：

this.enemies = [];

也许你应该尝试使用

this.set("enemies", [])

和

this.circle = this.paper.circle(100, 50, 30);

到

this.set("circle", this.get("paper").circle(100, 50, 30))

无法读取骨干中未定义的属性...

1 个答案: