main.js

cc.game.onStart = function(){
    if(!cc.sys.isNative && document.getElementById("cocosLoading")) //If referenced loading.js, please remove it
        document.body.removeChild(document.getElementById("cocosLoading"));

    // Pass true to enable retina display, on Android disabled by default to improve performance
    cc.view.enableRetina(cc.sys.os === cc.sys.OS_IOS ? true : false);
    // Adjust viewport meta
    cc.view.adjustViewPort(true);
    // Setup the resolution policy and design resolution size
    var size = cc.winSize;
    cc.view.setDesignResolutionSize(size.width, size.height, cc.ResolutionPolicy.SHOW_ALL);
    // Instead of set design resolution, you can also set the real pixel resolution size
    // Uncomment the following line and delete the previous line.
    // cc.view.setRealPixelResolution(960, 640, cc.ResolutionPolicy.SHOW_ALL);
    // The game will be resized when browser size change
    cc.view.resizeWithBrowserSize(true);
    //load resources
    cc.LoaderScene.preload(g_resources, function () {
        abird.run();
    }, this);
};
cc.game.run();