wx.getUserInfo({
   success: function (res) {
   that.setData({
     nickName: res.userInfo.nickName,
     avatarUrl: res.userInfo.avatarUrl,
   })
   },
})

https://api.weixin.qq.com/sns/jscode2session"htmlcode">

var openId = (wx.getStorageSync('openId'))
    if (openId) {
     wx.getUserInfo({
      success: function (res) {
       that.setData({
        nickName: res.userInfo.nickName,
        avatarUrl: res.userInfo.avatarUrl,
       })
      },
      fail: function () {
       // fail
       console.log("获取失败！")
      },
      complete: function () {
       // complete
       console.log("获取用户信息完成！")
      }
     })
    } else {
     wx.login({
      success: function (res) {
       console.log(res.code)
       if (res.code) {
        wx.getUserInfo({
         withCredentials: true,
         success: function (res_user) {
          wx.request({
           //后台接口地址
           url: 'https://....com/wx/login',
           data: {
            code: res.code,
            encryptedData: res_user.encryptedData,
            iv: res_user.iv
           },
           method: 'GET',
           header: {
            'content-type': 'application/json'
           },
           success: function (res) {
            // this.globalData.userInfo = JSON.parse(res.data);
            that.setData({
             nickName: res.data.nickName,
             avatarUrl: res.data.avatarUrl,
            })
            wx.setStorageSync('openId', res.data.openId);

           }
          })
         }, fail: function () {
          wx.showModal({
           title: '警告通知',
           content: '您点击了拒绝授权,将无法正常显示个人信息,点击确定重新获取授权。',
           success: function (res) {
            if (res.confirm) {
             wx.openSetting({
              success: (res) => {
               if (res.authSetting["scope.userInfo"]) {////如果用户重新同意了授权登录
                wx.login({
                 success: function (res_login) {
                  if (res_login.code) {
                   wx.getUserInfo({
                    withCredentials: true,
                    success: function (res_user) {
                     wx.request({
                      url: 'https://....com/wx/login',
                      data: {
                       code: res_login.code,
                       encryptedData: res_user.encryptedData,
                       iv: res_user.iv
                      },
                      method: 'GET',
                      header: {
                       'content-type': 'application/json'
                      },
                      success: function (res) {
                       that.setData({
                        nickName: res.data.nickName,
                        avatarUrl: res.data.avatarUrl,

                       })
                       wx.setStorageSync('openId', res.data.openId);
                      }
                     })
                    }
                   })
                  }
                 }
                });
               }
              }, fail: function (res) {

              }
             })

            }
           }
          })
         }, complete: function (res) {


         }
        })
       }
      }
     })

    }


 },
 globalData: {  
  userInfo: null
 }




后台是php 框架是laravel5.4版本


官方文档：


https://mp.weixin.qq.com/debug/wxadoc/dev/api/signature.html
微信官方提供了多种编程语言的示例代码（点击下载）。每种语言类型的接口名字均一致。调用方式可以参照示例。


下载之后在php文件中引入：




<"./PHP/wxBizDataCrypt.php";

    $code  =  $request->get('code');
    $encryptedData  =  $request->get('encryptedData');
    $iv  =  $request->get('iv');
    $appid = "***" ;
    $secret =  "***";

    $URL = "https://api.weixin.qq.com/sns/jscode2session";

    $apiData=file_get_contents($URL);
    // var_dump($code,'wwwwwwww',$apiData['errscode']);
    //   $ch = curl_init();
    // 　　curl_setopt($ch, CURLOPT_URL, $URL);
    // 　　curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    // 　　curl_setopt($ch, CURLOPT_HEADER, 0);
    // 　　$output = curl_exec($ch);
    // 　　curl_close($ch)

    if(!isset($apiData['errcode'])){
      $sessionKey = json_decode($apiData)->session_key;
      $userifo = new \WXBizDataCrypt($appid, $sessionKey);

      $errCode = $userifo->decryptData($encryptedData, $iv, $data );

      if ($errCode == 0) {
        return ($data . "\n");
      } else {
        return false;
      }
    }
  }




官方文档的登录流程图，整个登录流程基本如下图所示：

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