亲测，非常有用，非常有用，非常用。

引入微信jsdk依赖

<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>

主要代码：

function BGMAutoPlayMgr/* solveAndroidBGMAutoplay */(url) {
    this.audioContext = new (window.AudioContext || window.webkitAudioContext || window.mozAudioContext)();
    this.sourceNode = null;
    this.buffer = null;
    this.isPlayingBGM = false;
    this.toggleBGM = function () {
    if (typeof this.sourceNode == 'object') {
      if (this.isPlayingBGM) {
         this.sourceNode.stop();
         this.isPlayingBGM = false;
      } else this._playSourceNode();
    }
  }
  this._playSourceNode = function () {
     const audioContext = this.audioContext;
     audioContext.resume();
     const _sourceNode = audioContext.createBufferSource();
      _sourceNode.buffer = this.buffer;
      _sourceNode.loop = true;
      _sourceNode.connect(audioContext.destination);
     _sourceNode.start(0);
    this.sourceNode = _sourceNode;
    this.isPlayingBGM = true;
  }
  let loadAndAutoPlay = (audioUrl) => {
     const audioContext = this.audioContext;
     const xhr = new XMLHttpRequest();
     xhr.open('GET', audioUrl, true);
     xhr.responseType = 'arraybuffer';
    xhr.onreadystatechange = () => {
      if (xhr.status < 400 && xhr.status >= 200 && xhr.readyState === 4) {
       audioContext.decodeAudioData(xhr.response, buffer => {
       this.buffer = buffer;
     WeixinJSBridge.invoke("getNetworkType", {}, () => this._playSourceNode());
    });
   }
  }
  xhr.send();
}
   loadAndAutoPlay(url);
   loadAndAutoPlay = null;
}

// 调用
const bgm = new BGMAutoPlayMgr('www.mengxyz.com/images/zj.mp3');
bgm.toggleBGM();