uniapp 微信小程序获取手机号

引导用户点击下面的按钮：
<button class="sure" open-type="getPhoneNumber" @getphonenumber="getPhoneNumber">确定</button>

            //微信登录按钮点击事件
            async getPhoneNumber({
                detail: {
                    code,
                    encryptedData,
                    iv
                }
            }) {
                wx.login({
                    provider: 'weixin',
                    success: (res) => {
                        if (res.code) { //微信登录成功 已拿到code  
                            console.log(res.code,'code');
                            this.showflag_auth = false
                            uni.$u.http.post('/api/customer/wxxcxRegister', {
                                code: res.code,
                                encryptedData,
                                iv,
                            }).then(res => {
                                console.log(res);
                            })
                        }
                    },
                })
            },