小程序nfc相关代码: 

readEvent(){wx.getNFCAdapter().startDiscovery({success:(res)=>{console.log('--------------start--------')console.log(res);wx.getNFCAdapter().onDiscovered(callback=>{console.log('------------onDiscovered----------')console.log(callback);console.log(Array.from(new Uint8Array(callback.id)))console.log('------------getNfcA----------')console.log('------------connect----------')wx.getNFCAdapter().getNfcA().connect({success:(res)=>{console.info(res)console.log('------------transceive----------')wx.getNFCAdapter().getNfcA().transceive({data: new Uint8Array([0x30, 0x04]).buffer, // 必须要传入 ArrayBuffersuccess: (res) => {// res.data 是 ArrayBuffer，转成数组方便查看console.log(Array.from(new Uint8Array(res.data)));},fail:(err)=>{console.log(err)}})},fail:(err)=>{console.error(err);}})});},fail:(err)=>{}});},

connect 成功但是指令报错,报错信息:

transceive:fail:system internal error:tag was lost

解决方式,替换NfcA

readEvent(){wx.getNFCAdapter().startDiscovery({success:(res)=>{console.log('--------------start--------')console.log(res);wx.getNFCAdapter().onDiscovered(callback=>{console.log('------------onDiscovered----------')console.log(callback);console.log(Array.from(new Uint8Array(callback.id)))console.log('------------getNfcA----------')console.log('------------connect----------')wx.getNFCAdapter().getIsoDep().connect({success:(res)=>{console.info(res)console.log('------------transceive----------')wx.getNFCAdapter().getIsoDep().transceive({data: new Uint8Array([0x30, 0x04]).buffer, // 必须要传入 ArrayBuffersuccess: (res) => {// res.data 是 ArrayBuffer，转成数组方便查看console.log(Array.from(new Uint8Array(res.data)));},fail:(err)=>{console.log(err)}})},fail:(err)=>{console.error(err);}})});},fail:(err)=>{}});},