uni-app微信小程序授权登录

<button class='bottom' type='primary' open-type="getUserInfo" withCredentials="true" lang="zh_CN" @click="getUserInfo">授权微信</button>

getUserInfo() {
    uni.getUserProfile({
        lang: 'zh_CN',
        desc: '登录',
        success: infoRes => {
            this.userInfo=infoRes.userInfo; //用户信息，微信头像，昵称等等
            uni.login({
                success(res){
                    console.log(res.code)  //获取到的code
                }
            })            
        },
        fail(res) {
            uni.showToast({
                title:'登录授权失败',
                icon:'none',
            })
        }
    });
}