Page({
 data: {
  nickName: "微信账号登录",
  avatarUrl:"./user-unlogin.png",
 },
 onLoad: function () {
  var that = this;
  var nickName = that.data.nickName ;
  var avatarUrl = that.data.avatarUrl;
  var db="no";
  wx.getUserInfo({
   success: function (res) {
    that.data.nickName = res.userInfo.nickName,
    that.data.avatarUrl = res.userInfo.avatarUrl,
    that.setData({
     nickName: that.data.nickName,
     avatarUrl: that.data.avatarUrl,
    }),
    that.setData({
     db:"ok"// 设置变量db，只有成功获取用户信息后才写入数据库
    })
    if(db = "ok") {
     var name, url;
     wx.request({
      url: 'https://.../getuserinfo.php',//写自己的服务器
      header: {
       "Content-Type": "application/x-www-form-urlencoded"
      },
      method: "POST",
      data: {
       name: res.userInfo.nickName,
       url: res.userInfo.avatarUrl,
      },
      success: function () {
       console.log("success")
      },
      fail: function () {
       console.log("fail")
      }
     })
    }
   },
   fail: function (res) {
    that.data.nickName = "未授权无法获取用户信息",
     that.setData({
      nickName: that.data.nickName
     })
   }
  })
 },
onShow: function () {
 }
})

<"localhost";
$username = "root";
$password = "";//服务器中连接数据库的密码
$dbname = "mydb";//使用的数据库名
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检测连接
if ($conn->connect_error) {
 die("connect server fail: " . $conn->connect_error);
}
$sql = "INSERT INTO userinfo
VALUES ('$name', '$url')";
if ($conn->query($sql) === TRUE) {
 echo "insert success";
} else {
 echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
?>