微信小程序使用前置摄像头拍照

<template>
 <view title="拍照">
 <camera v-if="openCamera" device-position="front" frame-size="large" class="zipai" @error="error"> </camera>
 <cover-image src="/static/image/renzheng_zz.png" class="zhezhao"></cover-image>
 <cover-view class="wenzi fint34">请将正面人脸放在识别框中，进行拍摄</cover-view>
 <cover-image class="paizhao" src="/static/image/renzheng_pz.png" @click="takePhoto"></cover-image>
 </view>
</template>
 
<script>
 export default {
 data() {
 return {
 openCamera:true
 }
 },
 
 methods: {
 takePhoto() {
 const ctx = wx.createCameraContext()
 ctx.takePhoto({
  quality: 'high',
  success: (res) => {
  let tempFilePath = res.tempImagePath
  uni.navigateTo({
  url:'/pages/renzhengwxtu/renzhengwxtu?src='+tempFilePath
  })
  }
 })
 },
 //用户拒绝授权摄像头
 error(e) {
 this.openCamera=false
 wx.showModal({
  title: '警告',
  content: '若不授权使用摄像头，将无法使用拍照功能！',
  cancelText: '不授权',
  cancelColor: '#1ba9ba',
  confirmText: '授权',
  confirmColor: '#1ba9ba',
  success:(res)=> {
  if (res.confirm) {//允许打开授权页面
  //调起客户端小程序设置界面，返回用户设置的操作结果
  wx.openSetting({
  success:(res)=> {
   res.authSetting = {
   "scope.camera": true
   }
   this.openCamera=true
  },
  })
  } else if (res.cancel) {//拒绝打开授权页面
  wx.navigateBack({delta:1})
  }
  }
 })
 },
 
 }
 }
</script>

<template>
 <view title="预览图片">
 <image mode="widthFix" :src="src" class="renlian"></image>
 <view class="btns">
 <text @click="takePhoto">重拍</text>
 <text @click="usePhoto">使用照片</text>
 </view>
 </view>
</template>
 
<script>
 export default {
 data() {
 return {
 src: '',
 timeId:null,
 }
 },
 onLoad(option) {
 this.src=option.src
 },
 onHide() {
 clearTimeout(this.timeId);
 this.timeId=null;
 },
 methods: {
 takePhoto() {
 uni.navigateBack({delta: 1});
 },
 usePhoto() {
 this.$request.uploadFileMinipro(this.src,this.retoRenzheng);
 },
 retoRenzheng(){
 this.timeId=setTimeout(()=>{
  var pages = getCurrentPages();
  var prevPage = pages[pages.length - 3]; //上一个页面
  prevPage.fromTu= true;
  uni.navigateBack({delta: 2});
 },200);
 },
 }
 }
</script>

// uploadFileMinipro
function uploadFileMinipro(tempFilePath,callback){
 // 1.2 上传头像
 let uin =common.getGlobalUserInfo().id;
 let reurl=common.ip;
 uni.uploadFile({
 url: reurl,
 filePath: tempFilePath,
 name: "file",
 formData:{uin:uin},
 success:(res)=>{
 console.log("res=",res);
 // 注意，这里获得是一个string，需要转换一下
 let resData = JSON.parse(res.data);
 if (resData.status == 1) {//<=0:人工返回的错误信息
 setErrorMessage("上传成功");
 if (typeof callback === "function"){
  callback();//刷新当前页面
 }
 
 } else if (resData.status < 1) {
  setErrorMessage(resData.msg)
 } else {
  setErrorMessage()
 }
 },
 fail:(res)=>{
 console.log("上传失败");
 },
 });
}