ap.stopBluetoothDevicesDiscovery()

<script src="https://gw.alipayobjects.com/as/g/h5-lib/alipayjsapi/3.1.1/alipayjsapi.inc.min.js"></script>

<button id="J_btn_start" class="btn btn-default">开始搜索周围蓝牙设备</button>
<button id="J_btn_stop" class="btn btn-default">停止搜索周围蓝牙设备</button>
<script>
  var btnStart = document.querySelector('#J_btn_start');
  var btnStop = document.querySelector('#J_btn_stop');
  ap.onBluetoothDeviceFound(function(res){
    ap.showToast('搜索到' + res.devices.length + '个设备');
  });
  btnStart.addEventListener('click', function(){
    //此处 service 只是示例，并非真正的设备服务 id
    ap.startBluetoothDevicesDiscovery('0000fdd7-0000-1011-8004-00987f9b34fb');
  });
  btnStop.addEventListener('click', function(){
    ap.stopBluetoothDevicesDiscovery();
  });
</script>