要先做验证，再读块  function discoverHandler(res) {       if (res.techs.includes(nfc.tech.nfcA)) {         var arrayBuffer = new Uint8Array(res.id);         var tagId = me.bufArrToHex(arrayBuffer);         me.setData({           tagId: tagId         });         const nfcA = nfc.getMifareClassic();         nfcA.connect({           success:function(res){             //按块读取NFC的数据             const params = {               cmd: 0x60, // 验证指令               block: 0x03, // 扇区               cardId: [arrayBuffer[0], arrayBuffer[1], arrayBuffer[2], arrayBuffer[3]], // 卡片id 获取从 NFCAdapter.onDiscovered((res)=>{ // res中含有卡片id });               key: [0xff, 0xff, 0xff, 0xff, 0xff, 0xff], // 验证密钥             };             const arr = [params.cmd,params.block,...params.cardId,...params.key];             const writeBuffer = new Uint8Array(arr).buffer;             console.log(writeBuffer)             //认证             nfcA.transceive({               data: writeBuffer,               success:function(res){                 console.log(res)                 //读取扇区                 const arr = [0x30,params.block];                 const writeBuffer = new Uint8Array(arr).buffer;                 nfcA.transceive({                     data: writeBuffer,                     success:function(res){                       var arrayBuffer = new Uint8Array(res.data);                        var block = me.bufArrToHex(arrayBuffer);                        console.log(block)                     },                     fail:function(res){                       console.log(res)                     }                 })               },               fail:function(res){                 console.log(arguments)               }             });           },           fail:function(){             wx.showToast({               title: 'nfc读取失败',             })           }         });         console.log(nfcA)       }     }