change login by username

src/mock/login.js

@@ -25,9 +25,9 @@ const userMap = {
 }
 
 export default {
-  loginByEmail: config => {
-    const { email } = JSON.parse(config.body);
-    return userMap[email.split('@')[0]];
+  loginByUsername: config => {
+    const { username } = JSON.parse(config.body);
+    return userMap[username];
   },
   getInfo: config => {
     const { token } = param2Obj(config.url);