cocos2d-js 预加载

var HelloWorldLayer = cc.Layer.extend({
    sprite: null,
    ctor: function() {
        this._super();

        // 创建一个预加载场景
        var preloadScene = new cc.Scene();
        var preloadLayer = new PreloadLayer();
        preloadScene.addChild(preloadLayer);

        // 运行预加载场景
        cc.director.runScene(preloadScene);

        return true;
    }
});

var PreloadLayer = cc.Layer.extend({
    ctor: function() {
        this._super();

        // 预加载资源
        var resources = [
            "res/image1.png",
            "res/image2.png",
            "res/audio1.mp3",
            "res/audio2.mp3"
        ];

        var self = this;
        cc.loader.load(resources, function(err) {
            if (err) {
                cc.log("Error loading resources: ", err);
            } else {
                // 资源加载完成，切换到主场景
                var mainScene = new HelloWorldScene();
                cc.director.runScene(mainScene);
            }
        });

        return true;
    }
});