微信小程序授权打开摄像头，授权相册保存图片

1、授权打开摄像头

doTakePhoto() {
  let that = this
  wx.getSetting({
    success(res) {
    	// 第一次未授权
      if (res.authSetting['scope.camera'] === undefined) {
        wx.authorize({
          scope: 'scope.camera',
          success() {
            // 授权成功
            ...
          }
        })
      }
      // 第二次未授权
      else if (!res.authSetting['scope.camera'] && res.authSetting['scope.camera'] != undefined) {
        wx.showModal({
          title: '温馨提示',
          content: `请授权打开您的摄像头，拒绝授权将无法使用该功能`,
          cancelText: "不授权",
          confirmText: "继续授权",
          confirmColor: "#a08250",
          success(res) {
            if (res.confirm) {
              wx.openSetting({
                withSubscriptions: true,
                success() {
                  // 授权成功
                }
              })
            }
          }
        }, )
      }
      // 已授权
      else {
        ...
      }
    },
    fail(res) {
      console.log("wx