reBGM = function(){
            var bg = cc.audioEngine._currMusic;
            if(
                bg &&
                bg._touch === false &&
                bg._playing &&
                bg.getPlaying()
            ){
                bg._touch = true;
                bg.play(0, bg.loop);
                !polyfill.replay && cc._canvas.removeEventListener("touchstart", reBGM);
            }

        }
ome browsers must click on the page