getNFCStatus() {         var that = this;         const nfc = wx.getNFCAdapter();         this.nfc = nfc;         function discoverHandler(res) {             if (res.techs.includes(that.nfc.tech.mifareClassic)) {                 //获取NFCA实例                 const nfcM1 = that.nfc.getMifareClassic()                 that.nfcM1 = nfcM1             }             that.nfcM1.connect({                 success(res) {                         var array = new Uint8Array([0X30,0X00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF])                         that.nfcM1.transceive({                             data: array.buffer,                             success: (res) => {                                 console.log("NFC数据写入成功");                             },                             fail: (res) => {                                 console.log("NFC数据写入失败");console.log(res)                             },                             complete(res) {                                 console.log('res:', res)                             }                         })                 },                 fail(err) {                     console.log("err" + err)                 }             })             that.nfcM1.isConnected({                 success:(res)=>{                     var array = new Uint8Array([0X30,0X00])                     that.nfcM1.transceive({                         data: array.buffer,                         // data:sendData,                         success: (res) => {                             console.log("NFC数据写入成功");                             console.log(res.data)                             var result = that.ab2hex(res.data);                             console.log(result)                         },                         fail: (res) => {                             console.log("NFC数据写入失败");                             console.log(res)                         },                         complete(res) {                             console.log('res:', res)                         }                     })                 }             })             return         }         nfc.onDiscovered(discoverHandler)         nfc.startDiscovery({             fail(err) {                 console.log('failed to discover:', err)             },             success(res) {                 console.log("sucess to discover:", res)             }         })     }, 我的扇区密码是[0XFF,0XFF,0XFF,0XFF,0XFF,0XFF] 但我验证完成后，返回回来的扇区数据不对，不知道应该如何去验证这个扇区密码？

请问如何将float转为4字节的字节数组了？

Gitee上的文件大小有30K，下载到本地缓存后，只有2K大小   onclick(){     const targetPath = wx.env.USER_DATA_PATH;     console.log("targetPath=" + targetPath);     wx.downloadFile({         url: "https://gitee.com/timetech/ISUN/raw/master/ZL-S748_ISUN-STK_APP_V1.12.0.bin",         success: (result) => {             console.log(result)         },         fail: (res) => {             console.log("fail="+result)         }     })   } 返回回来的数据，显示只有1.2K大小，接口走的又是成功的回调，不知道问题原因出在哪里？ [图片]

微信小程序发送蓝牙数据， wx.writeBLECharacteristicValue 走success成功的回调，但 wx.onBLECharacteristicValueChange方法中没有接收到蓝牙设备发送过来的数据，蓝牙设备中也显示未收到小程序发送过来的数据。

最新版的微信开发者工具，无法使用es7语法，接入fackbook中的runtime.js后导入js使用await语句提示Unexpected reserved word 'await'报错