微信小程序实现倒计时调用相机自动拍照功能

<view class="userinfo-login">
<view class="page-body">
<view class="page-body-wrapper">
<view wx:if="{{src}}">

const app = getApp()
Page({
data: {
userInfo: {},counting: false//倒计时
},onLoad: function () {
this.daojishi();//一进来就拍照倒计时
this.ctx = wx.createCameraContext()//创建摄像头对象
},//倒计时
daojishi: function () {
var that = this;
if (!that.data.counting) {
//开始倒计时5秒
countDown(that,5);
}
}
})
//倒计时函数 在page外

function countDown(that,count) {
if (count == 0) {
//等于0时拍照
that.ctx.takePhoto({
quality: 'high',success: (res) => {
that.setData({
src: res.tempImagePath
})
wx.showToast({
title: '拍照完成',})
}
})
that.setData({
counting: false
})
return;
}
wx.showLoading({//加载时显示倒计时
title: '拍照倒计时'+count+'秒',})

setTimeout(function () {
wx.hideLoading()
},1000)
that.setData({
counting: true,})
setTimeout(function () {
count--;
countDown(that,count);
},1000);
}