authLogin () {
 wx.login({
 success: loginRes => {
 let code = loginRes.code // 獲取用戶臨時code
 wx.getUserInfo({
 success: function (res) {
 let encryptedData = res.encryptedData // 獲取加密數據
 let iv = res.iv // 解密參數
 // 發送解密必要數據到服務端
 wx.request({
 url: 'http://localhost',
 methods: 'POST',
 data: {
 code: code,
 encryptedData: encryptedData,
 iv: iv
 },
 succeess: res => {
 // 服務端首先調用微信接口獲取session_key
 // 用戶已經授權過的平臺會直接返回unionId
 // 沒有授權過則用session_key進行解密
 // 解密成功后服務端根據邏輯返回自定義信息
 }
 })
 }
 })
 }
 })
 }

<button open-type='getUserInfo' bindgetuserinfo="authLogin">微信登錄</button>

 // 獲取code
 onLoad: function (options) {
 this.getCodeTimer()
 },
 getCodeTimer () {
 wx.login({
 success: res => {
 this.data.code = res.code
 setTimeout(() => {
 this.getCodeTimer()
 }, 4 * 60 * 1000)
 }
 })
 },
 // 授權登錄
 authLogin(event) {
 if (event.detail.errMsg == 'getUserInfo:ok') {
 wx.showLoading()
 let reqData = {
 code: this.data.code,
 encryptedData: event.detail.encryptedData,
 iv: event.detail.iv
 }
 wx.request({
 url: 'http://localhost:8080',
 methods: 'POST',
 data: reqData,
 success: (res) => {
 console.log(res)
 // 請求完成
 }
 })
 } else {
 console.log('用戶拒絕授權')
 }
 }