uni-app微信小程序登录授权的实现

<button class="sys_btn" open-type="getUserInfo" lang="zh_CN" @getuserinfo="appLoginWx">{{loginInfo.openid != "" && loginInfo.openid != undefined "已授权" : "小程序授权"}}</button>

appLoginWx(){
        // #ifdef MP-WEIXIN
          uni.getProvider({
           service: 'oauth',
           success: function (res) {
            if (~res.provider.indexOf('weixin')) {
              uni.login({
                provider: 'weixin',
                success: (res) => {
                  _self.authorization = res.code;
                  uni.getUserInfo({
                    provider: 'weixin',
                    success: (info) => {//这里请求接口
                      console.log(res);
                      console.log(info);
                      
                    },
                    fail: () => {
                      uni.showToast({title:"微信登录授权失败",icon:"none"});
                    }
                  })
              
                },
                fail: () => {
                  uni.showToast({title:"微信登录授权失败",icon:"none"});
                }
              })
              
            }else{
              uni.showToast({
                title: '请先安装微信或升级版本',
                icon:"none"
              });
            }
           }
          });
          //#endif
      }

// #ifdef MP-WEIXIN
      uni.getSetting({
       success(res) {
        console.log("授权：",res);
        if (!res.authSetting['scope.userInfo']) {
          //这里调用授权
          console.log("当前未授权");
        } else {
          //用户已经授权过了
          console.log("当前已授权");
        }
       }
      })
      //#endif