//动态适配屏幕
cc.Class({
    extends: cc.Component,

    onLoad() {
        // cc.view.setDesignResolutionSize(720, 1280, cc.ResolutionPolicy.EXACT_FIT);
        var canvasSize = cc.view.getCanvasSize();
        var proportion = canvasSize.width / canvasSize.height;
        if (proportion >= 0.5) {
            cc.view.setDesignResolutionSize(720, 1280, cc.ResolutionPolicy.FIXED_HEIGHT);
        } else {
            cc.view.setDesignResolutionSize(720, 1280, cc.ResolutionPolicy.FIXED_WIDTH);
        }

    },

});