uni app的蓝牙api搜索不到蓝牙设备 搜索的特别慢，需要几分钟

uni app的蓝牙api搜索不到蓝牙设备，就是搜索的特别慢，

我在onLoad调用onBluetoothDeviceFound 来监听发现新的设备，但是我真机调试搜索很快，我打包发行后，发现搜索蓝牙设备特别慢，这是啥原因呢
是不是要发行的时候把APP的定位模块勾上

onLoad(options) {  
        this.type = options.type  
        let that = this  
        uni.onBluetoothAdapterStateChange((res) => {  
            that.searching = res.discovering  
            if (!res.available) {  
                that.searching = false  
            }  
        });  
        uni.onBluetoothDeviceFound((devices) => {  
            //剔除重复设备，兼容不同设备API的不同返回值  
            var isnotexist = true;  
            if (devices.deviceId) {  
                if (devices.advertisData) {  
                    devices.advertisData = app.globalData.buf2hex(devices.advertisData);  
                } else {  
                    devices.advertisData = '';  
                }  

                for (var i = 0; i < that.devicesList.length; i++) {  
                    if (devices.deviceId == that.devicesList[i].deviceId) {  
                        isnotexist = false;  
                    }  
                }  

                if (isnotexist) {  
                    that.devicesList.push(devices);  
                    that.$forceUpdate()  
                }  
            } else if (devices.devices) {  
                if (devices.devices[0].advertisData) {  
                    devices.devices[0].advertisData = app.globalData.buf2hex(devices.devices[0]  
                        .advertisData);  
                } else {  
                    devices.devices[0].advertisData = '';  
                }  

                console.log(devices.devices[0]);  

                for (var i = 0; i < that.devicesList.length; i++) {  
                    if (devices.devices[0].deviceId == that.devicesList[i].deviceId) {  
                        isnotexist = false;  
                    }  
                }  

                if (isnotexist) {  
                    that.devicesList.push(devices.devices[0]);  
                    that.$forceUpdate()  
                }  
            } else if (devices[0]) {  
                if (devices[0].advertisData) {  
                    devices[0].advertisData = app.globalData.buf2hex(devices[0].advertisData);  
                } else {  
                    devices[0].advertisData = '';  
                }  

                console.log(devices[0]);  

                for (var i = 0; i < devices_list.length; i++) {  
                    if (devices[0].deviceId == that.devicesList[i].deviceId) {  
                        isnotexist = false;  
                    }  
                }  

                if (isnotexist) {  
                    that.devicesList.push(devices[0]);  
                    that.$forceUpdate()  
                }  
            }  

            that.devicesList = that.devicesList  
            that.$forceUpdate()  
        });  
    },  
    onShow() {  
        this.Search()  
    },  
        methods: {  
        Search() {  
            var that = this;  
            if (!that.searching) {  
                // uni.closeBluetoothAdapter({  
                    // complete(res) {  
                        // console.log(res);  
                        uni.openBluetoothAdapter({  
                            success(res) {  
                                console.log(res);  
                                uni.getBluetoothAdapterState({  
                                    success(res) {  
                                        console.log(res);  
                                    }  
                                });  
                                uni.startBluetoothDevicesDiscovery({  
                                    allowDuplicatesKey: false,  
                                    success(res) {  
                                        console.log(res);  
                                        that.searching = true,  
                                            that.devicesList = []  

                                    }  
                                });  
                            },  
                            fail(res) {  
                                console.log(res);  
                                uni.showModal({  
                                    title: '提示',  
                                    content: '请检查手机蓝牙是否打开',  
                                    showCancel: false,  
                                    success(res) {  
                                        that.searching = false  
                                    }  
                                });  
                            }  
                        });  
                    // }  
                // });  
            } else {  
                uni.stopBluetoothDevicesDiscovery({  
                    success(res) {  
                        console.log(res);  
                        that.searching = false  

                    }  
                });  
            }  
        }  
       }