年度账单h5 移动端兼容问题以及优化建议(vue)

    _CountDownLoop() {
      let timer = null;
      timer = setInterval(() => {
      // to do
      }, 1000);
      this.$once('hook:beforeDestroy', () => {
        clearInterval(timer);
        timer = null;
      });
    }, 

   document.addEventListener('WeixinJSBridgeReady', () => {

      this.$refs.audio.play();

    }, false);

<audio ref="loading"  loop src="../../assets/audio/loading.mp3" atoplay  preload />

<audio ref="loading"  loop src="../../assets/audio/loading.mp3" preload />
mounted() {
　　this.$refs.audio.play();
}