问微信小程序ibeacon如何正确调用接口？这是我的demo，应该怎么改？

wx.startBeaconDiscovery({

uuids: ["EE527551-9C8F-C93C-B9CE-01D9E27D42B4", "70552625-45EE-CCB7-6BCE-6B597EB73EF2"],

success: function (res) {

// 监听iBeacon信号

wx.onBeaconUpdate(function (res) {

wx.getBeacons({

success: function (res) {

console.log("res:" + res.beacons);

}

})

if (res && res.beacons && res.beacons.length > 0) {

devices = res.beacons;

}

});

}

});