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微信小程序获取openid和session_key并且把openid存入数据库。已经调用openid的demo
前后端代码都有，后端php实现
在其它地方同步调用openid。（确保用户完成登录再进行后续的操作）；
onLoad:function(options){ getApp().promise.then(resolve => {var url = app.url + '/api/v1/Room/UserInfo'util.request(url, 'post', {name: userInfo.nickName,avatarUrl: userInfo.avatarUrl,accid: wx.getStorageSync('accid')}, '', function (res) {wx.redirectTo({url: '/pages/home/home'})})})}
小程序代码,获取openid，并且做同步的阻塞。
//app.jsvar util = require('utils/util.js');App({onLaunch: function() {this.url = 'http://127.0.0.1/smile_chatRoom/'var that = this;return that.promise = new Promise(function(resolve) {wx.login({success: function(res) {var data = {code: res.code}if (res.code) {//发起网络请求var url = that.url + '/login.php';util.request(url, 'POST', data, '', function(res) {console.log(res);that.openid = res.data.openid;wx.setStorageSync('openid', that.openid)resolve(that.openid);}, function(err) {console.log(err);})} else {console.log('登录失败！' + res.errMsg)}}});})}})
php 代码
<?phpheader("Content-Type:text/html;charset=utf8"); header("Access-Control-Allow-Origin: *"); //解决跨域header('Access-Control-Allow-Methods:POST');// 响应类型 header('Access-Control-Allow-Headers:*'); // 响应头设置 $link=mysql_connect("localhost","root","root"); mysql_select_db("smile", $link); //选择数据库mysql_query("SET NAMES utf8");//解决中文乱码问题$code = $_POST['code'];$url='https://api./sns/jscode2session?appid=wxfc20b2db0701ad17&secret=ffb74c8eb3f19699ec7f70861b8387ce&js_code='.$code.'&grant_type=authorization_code';$json = file_get_contents($url);//只返回openid，json是一个json对象$array = json_decode($json,TRUE);$obj = json_decode($json);$openid = $obj->openid;$q = "SELECT * FROM user"; //SQL查询语句 SELECT * FROM 表名$result = mysql_query("SELECT * FROM userWHERE openid='$openid'");$num=mysql_num_rows($result); //获取行数if($num>0){}else{//插入数据到数据库 $strsql = "insert into user (openid) values('$openid')";//mysql_query() 函数执行一条 MySQL 查询。SELECT，SHOW，EXPLAIN 或 DESCRIBE 都需要用这个函数执行$result = @mysql_query($strsql);}echo $openid;?>
