**

微信小程序开发nfc读取

**

（注释微信官方api，仅支持安卓，不支持苹果ios）官方文档

上代demo

<template>
	<div class="nfc">
		<u-navbar leftIcon="arrow-leftward" bgColor="#ffffff" leftIconColor="#000000" title="nfc管理" :autoBack="true"
			:safeAreaInsetTop="true" :placeholder="true" :fixed="true" titleStyle="font-size: 48rpx;color:#000000">
		</u-navbar>
		<button class="" @tap="read()">读取NFC</button>
		<textarea class="txtarea" disabled :value="readData" placeholder="nfc卡数据" />

		<textarea class="txtarea" style="margin-top: 26rpx;" v-model="writeTxt" maxlength="124"
			placeholder="请输入需要写入nfc的数据" />
		<button class="" @tap="write()">写入NFC</button>
		<button class="btn" @click="cleardata()">重置页面</button>
	</div>
</template>

<script>
	export default {
		data() {
			return {
				nfc: null,
				readData: '',
				writeTxt: '',

			}
		},

		onLoad() {
			this.nfc = wx.getNFCAdapter()
			// 开始监听   不能缺少
			this.nfc.startDiscovery({
				success(res) {
					console.log("建立连接", res)
				},
				fail(err) {
					console.log('建立连接err:', err)
				}
			})
		},
		onShow() {

		},
		onReady() {},
		methods: {
			read() { //读取
				// 绑定监听 NFC 标签
				this.nfc.onDiscovered(res => {
					console.log("监听的数据", res)
					if (res.messages && res.messages[0].records && res.messages[0].records[0].payload) {
						this.getData(res.messages[0].records[0].payload)
					} else {
						uni.showToast({
							icon: 'none',
							title: '卡片中无数据'
						})
					}
				})
			},
			getData(buffer) { //解析nfc卡中的数据
				const view = new Uint8Array(buffer);
				const txt = decodeURIComponent(escape(String.fromCharCode(...view))) // 兼容性写法
				this.readData = txt
				uni.showToast({
					icon: 'none',
					title: '数据读取成功'
				})
				console.log(txt);
			},
			write() {
				// 获取NFC实例
				// 绑定监听 NFC 标签
				this.nfc.onDiscovered(res => {
					console.log("写入监听连接", res)
					const NFC = this.nfc.getNdef()
					//进行写入
					NFC.connect({
						success: () => {
							NFC.writeNdefMessage({
								uris: [this.writeTxt], //写入类型
								success: (res1) => {
									uni.showToast({
										icon: 'none',
										title: '数据写入成功'
									})
									console.log('数据写入成功', res1)
								},
								fail: () => {
									uni.showToast({
										icon: 'none',
										title: '数据写入失败'
									})
									console.log('数据写入失败')
								},

							})

						},

					})

				})
			},
			cleardata() {
				this.readData = ''
				this.writeTxt = ''
			},

		},
		onHide() {
			if (this.nfc) {
				this.nfc.stopDiscovery()
			}
		}
	}
</script>

<style lang="scss" scoped>
	.nfc {
		padding-bottom: 50rpx;
		height: calc(100vh - 50rpx);
		background: #FBFBFB;
		overflow-x: hidden;
		overflow-y: auto;
		padding: 32rpx;

		.btn {
			margin-top: 26rpx;
		}

		.txtarea {
			border: 2rpx solid #d5d5d5;
			width: 100%;
		}
	}
</style>