微信小程序实现倒计时调用相机自动拍照功能

<!--index.wxml--> <view class="userinfo-login"> <view class="page-body">  <view class="page-body-wrapper">  <view wx:if="{{src}}"></view>   <!-- 如果存在已经拍好的照片就不再显示调用摄像头的组件-->  <view wx:else>   <camera device-position="back" flash="off" binderror="error" style="width: 100%; height: 200px;"></camera>  <!-- 调用摄像头的组件--></view>  <image wx:if="{{src}}" mode="widthFix" src="{{src}}"></image>  <!-- 显示拍好的照片-->  </view> </view> </view>

//index.jsconst 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);}