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@@ -129,4 +129,44 @@ logger.fatal('message');
 ```
 
 # Lib
-常用方法
+一些常用方法
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+```
+/**
+ * 返回错误信息
+ * @param res response object
+ * @param err error object
+ */
+export function errorRes(res, err) {}
+
+/**
+ * 返回正常http处理结果
+ * @param res response object
+ * @param data data object to be returned
+ */
+export function okRes(res, data) {}
+
+/**
+ * will throw error if current user is not logged in
+ * @param rootValue the rootValue
+ */
+export function requireLogin(rootValue) => {}
+
+/**
+ * Return a basic object structure with a generated id, createdAt, updatedAt timestamp and isRemove set to false
+ */
+export function createBasicOj () {}
+
+/**
+ * Randomly genreate a password from abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_-+= these characters with the given length
+ * @param length length of string to be generated
+ */
+export function generatePassword (length: number) : string {}
+
+/**
+ * Randomly generate a string from ABCDEFGHJKMNOPQRSTUVWXYZ0123456789 these characters, useful for genreating invitation code etc..
+ * @param length length of string to be generated
+ */
+export function generateCode (length: number) : string {}
+
+
+```
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