该功能实现需要使用以下API：

wx.startBeaconDiscovery(OBJECT)：开始搜索附近的iBeacon设备

wx.stopBeaconDiscovery(OBJECT)：停止搜索附近的iBeacon设备

wx.onBeaconUpdate(CALLBACK)：监听 iBeacon 设备的更新事件

wx.openBluetoothAdapter(OBJECT)：监听蓝牙状态

wx.onBluetoothDeviceFound(CALLBACK)：监听蓝牙状态切换

具体参数以及回调函数请参考官方API

实现逻辑：

实现代码 index.js：

onShow : function(){    var that = this;    //监测蓝牙状态的改变    wx.onBluetoothAdapterStateChange(function (res) {      if (res.available) {//如果用户打开蓝牙，开始搜索IBeacon        searchBeacon();      }    })    //搜索beacons    searchBeacon();    //搜索函数    function searchBeacon() {      //检测蓝牙状态      wx.openBluetoothAdapter({        success: function (res) {//蓝牙状态：打开          wx.startBeaconDiscovery({//开始搜索附近的iBeacon设备            uuids: ['FDA50693-A4E2-4FB1-AFCF-C6EB07647825'],//参数uuid            success: function (res) {              wx.onBeaconUpdate(function (res) {//监听 iBeacon 设备的更新事件                  //封装请求数据                 var beacons = res.beacons;                var reqContent = {};                var bleArray = [];                for (var i = 0; i  beacons.length; i++) {                  var bleObj = {};                  bleObj.distance = beacons[i].accuracy;                  bleObj.rssi = beacons[i].rssi;                  bleObj.mac = beacons[i].major + ":" + beacons[i].minor;                  bleArray.push(bleObj);                }                reqContent.ble = bleArray;                //请求后台向redis插入数据                redisSave(reqContent);              });            },            fail: function (res) {              //先关闭搜索再重新开启搜索,这一步操作是防止重复wx.startBeaconDiscovery导致失败              stopSearchBeacom();            }          })        },        fail: function (res) {//蓝牙状态：关闭          wx.showToast({ title: "请打开蓝牙", icon: "none", duration: 2000 })        }      })    }    function redisSave(reqContent) {      wx.request({        url: "https://map.intmote.com/LocateServer/location.action",        data: JSON.stringify(reqContent),        method: 'POST',        header: {          'Content-type': 'application/json'        },        success: function (res) {         // wx.showToast({ title: "seccess" })        },        fail: function (res) {         // wx.showToast({ title: "1" })        }      });    }    //关闭成功后开启搜索    function stopSearchBeacom() {      wx.stopBeaconDiscovery({        success: function () {          searchBeacon();        }      })    }     },

介绍小程序的页面生命周期函数之一：onShow

监听页面显示：即每次打开页面都会调用一次。