需求：
1、前端实现模拟用户人脸识别，识别成功后抓取视频流或认证的一张静态图给服务端。
2、服务端调用第三方活体认证接口，验证前端传递的人脸是否存在，把认证结果反馈给前端。
3、前端根据服务端返回的状态，显示在页面上用于提示用户。
难点：
1、前端APP如果要实现人脸活体校验验证，需要对接大厂的SDK实现。
2、一开始我采用用使用在App内嵌套H5来单独部署一套人脸验证，把结果通过webview与APP进行数据交互，但是H5试了使用好用高效的effet.js 库人脸识别 目前仅支持H5（但是发现最后在手机上识别人像整个人被压缩似得，而且是反向镜头，跟作者已反馈，等待作者持续更新）。
3、抛弃了使用App嵌套H5方法，因此最终选择了使用原生live-pusher直播流来模拟实现人脸识别效果。本打算给大家写成组件方便大家直接调用来着，但是发现组件内获取实例仅支持在onReady页面生命周期使用。
实现思路
1、首先需要获取手机是否有录音以及相机权限，没有的话引导用户前去设置页主动设置。
2、其次创建live-pusher实例，根据业务需求实现自己的模拟人脸识别思路（目前我们这是在用户手动点击5s后进行自动抓拍的）。
3、前端拿到抓拍最后一帧图片调用接口给服务端传递，服务端调用第三方进行人脸活体检测，一般是需要付费的哈。
4、最后前端把服务端返回的识别状态展示在页面上，方便后续用户操作。
代码步骤（当前是vue3项目示例，最低sdk 21版本并且勾选livepusher）
1、获取当前手机是否允许开启相机和录音权限。（建议直接使用官方大佬写的js sdk）App权限判断和提示
引入js sdk插件（vue3版本需要转换为export function，vue2版本直接按照官方大佬的直接使用即可）
import {requestAndroidPermission,gotoAppPermissionSetting} from '@/js_sdk/wa-permission/permission.js'2、创建live-pusher实例，根据业务需求写业务逻辑（注意：一定要用nvue页面哈，cover-image覆盖一个矢量图在直播流画面上）。
ilve-pusher详细参数说明具体看live-pusher官方文档
<template><view class="container"><live-pusher id='livePusher' ref="livePusher" class="livePusher" url="" mode="FHD" :muted="true":enable-camera="true" :auto-focus="true" :beauty="2" whiteness="2" aspect="9:16" local-mirror="disable"@statechange="statechange" @error="error" @netstatus="netstatus" :style="[{width:'400rpx',height: '400rpx',marginLeft: '175rpx',marginTop:'20rpx',}]"></live-pusher><cover-image style="width: 400rpx;height: 400rpx;transform: scale(1.01);position: absolute;left: 175rpx;top: 190.5rpx;" src="@/static/circleBg.png" /></view>
</template>
<script>
export default{onReady() {//需要在onReady页面生命周期函数来写this.livePusher = uni.createLivePusherContext("livePusher", this);},
}
</script>3、5s后抓拍最后一帧图片给服务端，人脸识别成功即登录系统，识别失败跳转认证失败页面（这里跟服务端对接采用的formdata格式上传文件流，你也可以采取转成base64）
临时路径转base64
// 定时器 几秒后自动抓拍handleSetTime() {this.timeFlag = setInterval(async () => {if (this.timeOut > 0) {this.timeOut--this.titleTips = this.countDownTimerStartTipsthis.buttonTip = `${this.countDownTimerStartBtnTips} ${this.timeOut}秒`}if (this.timeOut == 1) {this.livePusher.snapshot({success: (res) => {this.snapshotInfo = res.message}})}// 进行快照人脸认证if (this.timeOut == 0) {clearInterval(this.timeFlag);this.titleTips = this.countDownTimerZeroTipsthis.buttonTip = this.countDownTimerZeroBtnTipsuni.showLoading({title: this.countDownTimerZeroBtnTips})uni.uploadFile({url: 'http://192.168.60.2:8080/bsCheckImage/checkImg',filePath: this.snapshotInfo.tempImagePath,name: "file",success: (uploadFileRes) => {const jxStrData = JSON.parse(uploadFileRes.data)console.log(jxStrData)const resResultCode = jxStrData.codeconst resResultData = jxStrData.dataif (resResultCode !== '00000') {uni.navigateTo({url: '/pages/liveb-result/liveb-result?failResultObj=' +this.passData(jxStrData)})this.handleStop()return}if (resResultCode == '00000' && resResultData.score >= 0.8) {uni.showToast({title: this.faceSucessTips})this.buttonTip = this.faceSucessTipsthis.handleStop()return}if (resResultCode == '00000' && resResultData.score < 0.8) {const paramsData = {success: false,code: 'A9901',message: '人脸校验失败，请将人脸正对取景框内重新认证',failCode: 'A9901',faceScore: resResultData.score}uni.navigateTo({url: '/pages/liveb-result/liveb-result?failResultObj=' +this.passData(paramsData)})this.handleStop()return}},fail: (error) => {uni.hideLoading()uni.navigateTo({url: '/pages/liveb-result/liveb-result',animationType: 'zoom-out',animationDuration: 1000})this.handleStop()},complete: () => {uni.hideLoading()clearInterval(this.timeFlag) // 清除定时器，防止再次执行}});}}, 1000)},4、人脸认证失败服务端返回状态，前端跳转认证失败页面，返回时给上个页面传递监听参数。（liveb-result.vue页面）
<template><view class="container"><view class="result-area"><view class="result-icon"><image class="result-icon-pic" src="../../static/fece_result.png"></image></view><view class="result-tips">{{failInfos.message}}</view><view class="result-button" @click="handleRetryFace">重新认证</view></view></view>
</template><script setup>import {ref} from 'vue'import {onLoad,onBackPress} from '@dcloudio/uni-app'const faceStatus = ref('')const failInfos = ref({})const failResultMsg = (() => {const data = {code: '3698',msg: '人脸认证失败'}uni.$emit('failResult', data);})onLoad((options) => {if (options.failResultObj) {const resultObj = JSON.parse(decodeURIComponent(options.failResultObj));failInfos.value = resultObj}})const handleRetryFace = (() => {console.log('handleRetryFace')failResultMsg()uni.navigateBack()})onBackPress((e) => {failResultMsg()})
</script><style lang="scss" scoped>.container {width: 750rpx;.result-area {position: absolute;top: 44%;left: 50%;transform: translate(-50%, -50%);.result-icon {display: flex;align-items: center;justify-content: center;.result-icon-pic {width: 140rpx;height: 140rpx;}}.result-tips {font-weight: 600;text-align: center;font-size: 32rpx;color: #515151;margin-top: 20rpx;margin-bottom: 60rpx;}.result-button {padding: 20rpx 100rpx;background-color: rgba(12, 75, 158, 1);border-radius: 60rpx;color: #eeeeee;}}}
</style>人脸识别页面所有代码（liveb.nvue）
<template><view class="container"><view class="header"><view class="header-title"><text class="header-title-tips">{{titleTips}}</text><view class="header-title-carmera"><image class="header-title-img" src="../../static/change_camera.png" @click="handleChangeCrame"></image></view></view></view><live-pusher id='livePusher' ref="livePusher" class="livePusher" url="" mode="FHD" :muted="true":enable-camera="true" :auto-focus="true" :beauty="2" whiteness="2" aspect="9:16" local-mirror="disable"@statechange="statechange" @error="error" @netstatus="netstatus" :style="[{width:'400rpx',height: '400rpx',marginLeft: '175rpx',marginTop:'20rpx',}]"></live-pusher><cover-image style="width: 400rpx;height: 400rpx;transform: scale(1.01);position: absolute;left: 175rpx;top: 190.5rpx;" src="@/static/circleBg.png" /><view class="footer"><view class="footer-tips"><text class="footer-tips-first">{{footerTipsFirst}}</text><text class="footer-tips-second">{{footerTipsSecond}}</text></view><view class="footer-required"><view class="footer-required-row"><view class="row-area" v-for="(item,index) in tipList" :key="index"><image class="row-area-img" :src="item.icon"></image><text class="row-area-tip">{{item.name}}</text></view></view></view></view><!-- 手动抓拍 --><view class="start-button" :style="{marginTop:footerBtnStyle.marginTop}"><view class="button-hover":style="{width:footerBtnStyle.width,padding:footerBtnStyle.padding,borderRadius:footerBtnStyle.borderRadius,backgroundColor:footerBtnStyle.btnBackground}"@click="startFace"><text class="button-tip" :style="{fontSize:footerBtnStyle.fontSize,color:footerBtnStyle.textColor}">{{buttonTip}}</text></view></view></view>
</template><script>import {requestAndroidPermission,gotoAppPermissionSetting} from '@/js_sdk/wa-permission/permission.js'export default {name: 'sevenq-faceLiver',props: {//是否默认开启抓拍isDeaultStartLive: {type: Boolean,default: false},//默认开启的话需要设置延迟时间(毫秒级)defaultStartDelayTime: {type: Number,default: 600},//是否需要监听结果页传递的事件needListenResultPage: {type: Boolean,default: true},//是否开启可以翻转摄像头isCanChangeCarame: {type: Boolean,default: true},//抓拍倒计时 （如果默认开启需要+1)snapCountdownTimer: {type: Number,default: 6},//如果不允许翻转摄像头 提示词notAllowChangeCarameMsg: {type: String,default: "刷脸认证仅支持前置摄像头"},//顶部提示词topTitleTips: {type: String,default: "请把人脸放在圆圈内拍摄脸部，开始人脸识别"},//提示词 1 footerTipsFirst: {type: String,default: "确认为您本人照片"},//提示词 2footerTipsSecond: {type: String,default: "保持正脸在取景框中系统将在5s后自动抓拍"},//提示展示列表tipList: {type: Object,default: [{icon: "../../static/img3.png",name: '正对手机'},{icon: "../../static/img2.png",name: '光线充足'},{icon: "../../static/img1.png",name: '脸无遮挡'},]},//抓拍倒计时开始时提示词countDownTimerStartTips: {type: String,default: "请保存人脸在实景框中，正在进行抓拍"},//抓拍倒计时为0时提示词countDownTimerZeroTips: {type: String,default: "正在人脸认证中，请稍等..."},//按钮默认文本buttonTips: {type: String,default: "开始人脸识别"},//抓拍倒计时开始时按钮显示提示词countDownTimerStartBtnTips: {type: String,default: "正在抓拍中"},//抓拍倒计时为0时按钮提示词countDownTimerZeroBtnTips: {type: String,default: "人脸认证中...."},//认证成功按钮提示词faceSucessTips: {type: String,default: "认证成功"},//权限提示开启提示词premissonTips: {type: String,default: "当前应用需要使用相机权限进行拍照，但相机权限暂未开启。是否前往应用设置打开相机权限？"},//底部按钮样式footerBtnStyle: {type: Object,default: {marginTop: '120rpx',width: '480rpx',padding: '24rpx',btnBackground: 'rgba(12, 75, 158, 1)',borderRadius: '300rpx',textColor: '#dfdfdf',fontSize: '32rpx'}}},data() {return {titleTips: this.topTitleTips,buttonTip: this.buttonTips,livePusher: '', // livePusher实例snapshotInfo: '', // 快照信息showCountDown: false, // 拍摄倒计时timeOut: this.snapCountdownTimer, // 签到倒计时timeFlag: null, // 定时器isPass: null, // 是否通过人脸认证phoneSysInfos: {}, //当前手机系统信息}},onReady() {this.livePusher = uni.createLivePusherContext("livePusher", this);},onShow() {//监听结果页面传递的失败事件if (this.needListenResultPage) {uni.$on('failResult', (resultData) => {if (resultData.code == '3698') {clearInterval(this.timeFlag)this.resertAll()this.livePusher.startPreview()}});}},async mounted() {const that_ = thisif (!that_.showCountDown) {setTimeout(function() {that_.getCarmeraPremisson()}, this.defaultStartDelayTime)}that_.getPhoneSys()},onUnload() {if (this.needListenResultPage) {uni.$off('failResult');}clearInterval(this.timeFlag)uni.hideLoading();},onHide() {console.log('页面隐藏')},methods: {//校验是否获取相机权限async getCarmeraPremisson() {const currentSystem = uni.getSystemInfoSync().platformif (currentSystem == 'android') {const result = await requestAndroidPermission("android.permission.CAMERA")if (result == 1) {if (this.isDeaultStartLive) { //如果打开页面就进行抓拍this.showCountDown = true}this.startPreview()} else {uni.showModal({title: '提示',content: this.premissonTips,confirmText: '去设置',cancelText: '取消',success: function(res) {if (res.confirm) {gotoAppPermissionSetting()} else if (res.cancel) {uni.showToast({icon: 'error',title: '暂无相机权限'})}}});}}},//重置初始化值 需要在认证失败时候再次调用resertAll() {this.titleTips = this.topTitleTipsthis.buttonTip = this.buttonTipsthis.snapshotInfo = '' // 快照信息this.showCountDown = false // 拍摄倒计时this.timeOut = this.snapCountdownTimer // 签到倒计时this.timeFlag = null // 定时器this.isPass = null // 是否通过人脸认证},//手动翻转摄像头handleChangeCrame() {if (!this.isCanChangeCarame) {uni.showToast({icon: 'none',title: this.notAllowChangeCarameMsg})return}this.livePusher.switchCamera({success: (a) => {uni.showToast({icon: 'none',title: '摄像头翻转成功'})}});},//手动开始人脸识别startFace() {const that_ = thisif (!that_.showCountDown) {that_.showCountDown = trueif (that_.showCountDown) {const {platform,osVersion} = that_.phoneSysInfosif (platform == 'android' && osVersion < 10) { //判断兼容安卓10以下效果that_.startPreview()return}that_.handleSetTime()}}},// 开始预览直播流startPreview() {const _that = thisthis.livePusher.startPreview({success: (res) => {if (_that.showCountDown) {_that.handleSetTime()}}})},// 定时器 几秒后自动抓拍handleSetTime() {this.timeFlag = setInterval(async () => {if (this.timeOut > 0) {this.timeOut--this.titleTips = this.countDownTimerStartTipsthis.buttonTip = `${this.countDownTimerStartBtnTips} ${this.timeOut}秒`}if (this.timeOut == 1) {this.livePusher.snapshot({success: (res) => {this.snapshotInfo = res.message}})}// 进行快照人脸认证if (this.timeOut == 0) {clearInterval(this.timeFlag);this.titleTips = this.countDownTimerZeroTipsthis.buttonTip = this.countDownTimerZeroBtnTipsuni.showLoading({title: this.countDownTimerZeroBtnTips})// this.$emit(handleStartFaceApi, {// code: '4364',// msg: '开始人脸与服务端进行人脸',// currentTempImagePath: this.snapshotInfo.tempImagePath// })uni.uploadFile({url: 'http://192.168.60.2:8080/bsCheckImage/checkImg',filePath: this.snapshotInfo.tempImagePath,name: "file",success: (uploadFileRes) => {const jxStrData = JSON.parse(uploadFileRes.data)console.log(jxStrData)const resResultCode = jxStrData.codeconst resResultData = jxStrData.dataif (resResultCode !== '00000') {uni.navigateTo({url: '/pages/liveb-result/liveb-result?failResultObj=' +this.passData(jxStrData)})this.handleStop()return}if (resResultCode == '00000' && resResultData.score >= 0.8) {uni.showToast({title: this.faceSucessTips})this.buttonTip = this.faceSucessTipsthis.handleStop()return}if (resResultCode == '00000' && resResultData.score < 0.8) {const paramsData = {success: false,code: 'A9901',message: '人脸校验失败，请将人脸正对取景框内重新认证',failCode: 'A9901',faceScore: resResultData.score}uni.navigateTo({url: '/pages/liveb-result/liveb-result?failResultObj=' +this.passData(paramsData)})this.handleStop()return}},fail: (error) => {uni.hideLoading()uni.navigateTo({url: '/pages/liveb-result/liveb-result',animationType: 'zoom-out',animationDuration: 1000})this.handleStop()},complete: () => {uni.hideLoading()clearInterval(this.timeFlag) // 清除定时器，防止再次执行}});}}, 1000)},//向下个页面传递参数passData(obj) {let passDataStr = JSON.stringify(obj)let newPassDataStr = passDataStr.replace(/%/g, '%25');return encodeURIComponent(newPassDataStr);},//抛出停止推流 在调用成功与失败都得调用handleStop() {this.livePusher.stop()},//监听直播流状态变化statechange(val) {console.log(val, '监听直播流变化')},//监听直播流警告error(err) {console.log(err, '监听直播流警告')},//监听网络状态netstatus(status) {console.log(status, '监听直播流网络状态')},//获取手机型号getPhoneSys() {const system = uni.getDeviceInfo()this.phoneSysInfos = system}}}
</script><style lang="scss" scoped>.container {width: 750rpx;}
</style>效果图如下所示
