用户在使用小程序时，经常需要授权登录，授权登录的作用是获取用户的基本信息，如头像、昵称以及openid等，openid可用于微信授权手机号、微信支付。
微信授权登录
.xhtml如下，wxLogin为自定义方法
<button open-type="getUserInfo" bindgetuserinfo="wxLogin"></button>
.js如下
// 微信登录wxLogin (e) {let reqUrl = api // 后台请求接口let signature = e.detail.signaturelet rawData = e.detail.rawDatalet encryptedData = e.detail.encryptedDatalet iv = e.detail.ivlet reqData = {'signature': signature,'rawData': rawData,'encryptedData': encryptedData,'iv': iv}if (e.detail.userInfo) {wx.login({success: (res) => {let code = res.codereqData['code'] = codewx.request({url: reqUrl,method: 'POST',data: reqData,success: (res) => {let resData = res.dataif (resData.code != 1) {console.log('fail')}else {let token = resData.data.datalet openid = resData.data.openidlet session3rd = resData.data.session3rdwx.setStorageSync("token", token)wx.setStorageSync("openid", openid)wx.setStorageSync("session3rd", session3rd)}}})}})}},
微信授权绑定手机号
.xhtml如下，getPhoneNumber为自定义方法
<button open-type="getPhoneNumber" bindgetphonenumber="getPhoneNumber"></button>
.js如下
getPhoneNumber (e) {let reqUrl = api // 后台接口let encryptedData = e.detail.encryptedDatalet iv = e.detail.ivlet session3rd = wx.getStorageSync("session3rd") // 由第一步"微信授权"操作后台返回let openid = wx.getStorageSync("openid") // 由第一步"微信授权"操作后台返回let token = wx.getStorageSync("token") // 由第一步"微信授权"操作后台返回let reqData = {'encryptedData': encryptedData,'iv': iv,'3rd_session': session3rd,'openid': openid}wx.request({url: reqUrl,header: {'token': token},method: 'POST',data: reqData,success: (res) => {let resData = res.dataif (resData.code !== 1) {console.log('fail')}else {console.log('success')}}})},
值得注意的是：以上代码中的session3rd并不是固定的变量名，具体由后台同事声明，也可能是session_3rd，session_key
