Cocos2d-js:当从一个应用程序移动到另一个应用时,对浏览器上运行的Cocos2d-j应用程序的影响

我在浏览器上运行cocos2d网站上提供的跑酷游戏。一切都很好,但当我从浏览器移到premium文本并返回浏览器时,正在运行的播放器开始出现一些意外行为,播放器从其位置消失,几秒钟后,它掉在地上,然后再次开始运行。每当我从一个应用程序移到另一个应用时,就会发生这种情况。

我不知道为什么会这样。有人能告诉我如何防止这种情况发生吗?

下面是动画层的代码:-

       var AnimationLayer = cc.Layer.extend({
spriteSheet: null,
runningAction: null,
sprite: null,
space:null,
body:null,
shape:null,

ctor:function (space) {
    this._super();
    this.space = space;
    this.init();

    this._debugNode = cc.PhysicsDebugNode.create(this.space);
    this._debugNode.setVisible(false);
    // Parallax ratio and offset
    this.addChild(this._debugNode, 10);
},
init:function () {
    this._super();

    // create sprite sheet
    cc.spriteFrameCache.addSpriteFrames(res.runner_plist);
    this.spriteSheet = cc.SpriteBatchNode.create(res.runner_png);
    this.addChild(this.spriteSheet);


    // init runningAction
    var animFrames = [];
    for (var i = 0; i < 8; i++) {
        var str = "runner" + i + ".png";
        var frame = cc.spriteFrameCache.getSpriteFrame(str);
        animFrames.push(frame);
    }

    var animation = cc.Animation.create(animFrames, 0.1);
    this.runningAction = cc.RepeatForever.create(cc.Animate.create(animation));


    //create runner through physic engine
    this.sprite = cc.PhysicsSprite.create("#runner0.png");
    var contentSize = this.sprite.getContentSize();
    // init body
    this.body = new cp.Body(1, cp.momentForBox(1, contentSize.width, contentSize.height));
    this.body.p = cc.p(g_runnerStartX, g_groundHight + contentSize.height / 2);
    this.body.applyImpulse(cp.v(150, 0), cp.v(0, 0));//run speed
    this.space.addBody(this.body);
    //init shape
    this.shape = new cp.BoxShape(this.body, contentSize.width - 14, contentSize.height);
    this.space.addShape(this.shape);

    this.sprite.setBody(this.body);
    this.sprite.runAction(this.runningAction);

    this.spriteSheet.addChild(this.sprite);

    this.scheduleUpdate();
},

getEyeX:function () {
    return this.sprite.getPositionX() - g_runnerStartX;
}});

这是playScene.js的代码:-

    var PlayScene = cc.Scene.extend({
space:null,
gameLayer:null,
// init space of chipmunk
initPhysics:function() {
    this.space = new cp.Space();
    // Gravity
    this.space.gravity = cp.v(0, -350);
    // set up Walls
    var wallBottom = new cp.SegmentShape(this.space.staticBody,
        cp.v(0, g_groundHight),// start point
        cp.v(4294967295, g_groundHight),// MAX INT:4294967295
        0);// thickness of wall
    this.space.addStaticShape(wallBottom);
},
onEnter:function () {
    this._super();
    this.initPhysics();



    this.gameLayer = cc.Layer.create();

    //add three layer in the right order
    this.gameLayer.addChild(new BackgroundLayer(), 0, TagOfLayer.background);
    this.gameLayer.addChild(new AnimationLayer(this.space), 0, TagOfLayer.Animation);
    this.addChild(this.gameLayer);
    this.addChild(new StatusLayer(), 0, TagOfLayer.Status);

    this.scheduleUpdate();

},
update:function (dt) {
    // chipmunk step
    this.space.step(dt);
    var animationLayer = this.gameLayer.getChildByTag(TagOfLayer.Animation);
    var eyeX = animationLayer.getEyeX();

    this.gameLayer.setPosition(cc.p(-eyeX,0));
}

});