创建并连接数据库，并修改登录和注册接口

node_modules/mysql2/lib/promise/make_done_cb.js

@@ -0,0 +1,16 @@
+'use strict';
+
+const { applyCapturedStack } = require('./capture_local_err.js');
+
+function makeDoneCb(resolve, reject, stackHolder) {
+  return function (err, rows, fields) {
+    if (err) {
+      applyCapturedStack(err, stackHolder);
+      reject(err);
+    } else {
+      resolve([rows, fields]);
+    }
+  };
+}
+
+module.exports = makeDoneCb;