test:async function(){     var that=this;     console.log('0');     const p=await new Promise(function(resolve,reject){                   that.a();       resolve();              })            console.log('2');   },   a:function(){         wx.showModal({       showCancel: false,       confirmText:'确定',       content:'1',       title:'提示',       success:function(res){         if(res.confirm){           console.log('1');                   }       }     }) 如何在函数里调用另一个函数?目的是按顺序执行输出012，我试过直接将wx.showModal放到Promise里是可以按顺序输出的。

想通过小程序连接ESP32模块配网（AP模式），用AT指令已设置好，但小程序好像连不上，串口工具也没有显示相关信息？ [图片] 手机->设置连上后串口会显示下图，但小程序什么都没有返回信息？ [图片]

求助大神帮助，现场有7-8蓝牙模块，第一次搜到一个能显示出来，第二次能显示两个，但后台显示有四个，为什么不能全部显示出来？ Page({   data:{     devices:[],   },   onPullDownRefresh:function(){     this.onBluetoothDeviceFound();   },   show_device:function(){     //初始化蓝牙模块     wx.openBluetoothAdapter({       success: (res) => {         console.log('openBluetoothAdapter success',res);         //获取本机蓝牙适配器状态         wx.getBluetoothAdapterState({           success:(res)=>{             console.log('getBluetoothAdapterState',res);             //discovering是否在搜索             if(res.discovering){               this.onBluetoothDeviceFound();             //available蓝牙适配器是否可用               }else if(res.available){               wx.startBluetoothDevicesDiscovery({                 allowDuplicatesKey: true,                 success:(res)=>{                   console.log('startBluetoothDevicesDiscovery success',res);                   this.onBluetoothDeviceFound();                 },                 fail:(res)=>{                   console.log('搜索蓝牙失败');                 }               })             }           }         })       },     })     console.log(this.data.devices);   },     onBluetoothDeviceFound:function(){     var i=0;     wx.getBluetoothDevices({       success: (res) => {         console.log(res);         res.devices.forEach((device)=>{           if(!device.name||!device.localName){             return;           }           var name=`devices[${i}].name`;           var deviceId=`devices[${i}].deviceId`;           var rssi=`devices[${i}].rssi`;                   var localName=`devices[${i}].localName`;                           this.setData({[name]:device.name,[deviceId]:device.deviceId,[rssi]:device.RSSI,[localName]:device.localName});           i=+1;         })       },     })   },   stop_device:function(){     this.stopBluetoothDevicesDiscovery();   },   stopBluetoothDevicesDiscovery:function(){     wx.stopBluetoothDevicesDiscovery();   },   conn_event:function(e){     console.log(e);   } }) [图片][图片]

最近学习蓝牙模块，将字符串转换成16进制形式发到蓝牙模块，但转换出来开头缺少符号“0x”，如字符串"1234",转成 ["31", "32", "33", "34"]，但蓝牙模块无法识别，只能识别[0x31, 0x32, 0x33, 0x34]这个形式，网上下载代码 stringToBytes:function(str){ var array = []; array.push("0x"); for (var i = 0; i < str.length; i++) { array.push((str.charCodeAt(i)).toString(16)); } array.join(""); console.log(array); let buffer = new Uint16Array (array).buffer; return array; }, 但结果["31", "32", "33", "34"]一样是无，求大神救助。