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我正在尝试将我用 raphael.js 制作的这个简单项目转换为使用backbone.js，但我一直遇到同样的错误，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，但我仍然收到此错误“无法读取未定义的属性“长度””，例如一个数组。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" });
        },
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1 回答 1

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去做这个：

this.enemies = [];

也许你应该尝试使用

this.set("enemies", [])

和

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

至

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

于 2013-05-07T02:40:05.387 回答