已解决，不知道靠不靠谱贴上代码。 button 组件授权后在调用wx.login 进行解密

userInfoHandler: function (e) {

let that = this;

if (e.detail.errMsg ==‘getUserInfo:ok’) {

wx.login({

success: function ® {

let code = r.code;

if (code) {

// 解密用户数据

wx.request({

url: url,

method: ‘post’,

header: {‘content-type’: ‘application/x-www-form-urlencoded’},

data: {encryptedData: e.detail.encryptedData, iv: e.detail.iv, code: code},

success: function (data) {

console.log(data);

if (data.data.status == 1) {

app.globalData.userInfo = data.data.userInfo;

wx.setStorageSync(‘userInfo’, data.data.userInfo); // 缓存用户信息

typeof cb == “function” && cb(app.globalData.userInfo);

app.navigateBack(‘navigateTo’, ‘/pages/index/index’);

} else {

// 失败

that.showMsg(data.data.msg);

}

},

fail: function (err) {

that.showMsg(err.errMsg);

console.log(err)

}

})

} else {

that.showMsg(err.errMsg);

console.log(‘获取用户登录态失败！’, err)

}

},

fail: function (err) {

that.showMsg(err.errMsg);

console.log(‘登陆失败’, err);

}

})

}

}