feat: add checkClass API for querying course creation count

新增checkClass接口用于查询用户创建课程的数量，通过解析请求url中的userid参数调用getmysql执行对应查询逻辑

pbl.js

@@ -10776,6 +10776,12 @@ router.route('/sort_resource').all((req, res, next) => {
     postmysql(req, res, "sort_resource");
 });
 
+//查询创建课程数量
+router.route('/checkClass').all((req, res, next) => {
+    var json = queryString(req.url);
+    getmysql(req, res, "checkClass", json['userid']);
+});
+
 function generateAPIKey(username) {
     let timeStamp = new Date().getTime();