perf[utils]: optimizate variable name

src/views/login/index.vue

@@ -71,7 +71,7 @@
 </template>
 
 <script>
-import { isvalidUsername } from '@/utils/validate'
+import { validUsername } from '@/utils/validate'
 import LangSelect from '@/components/LangSelect'
 import SocialSign from './socialsignin'
 
@@ -80,7 +80,7 @@ export default {
   components: { LangSelect, SocialSign },
   data() {
     const validateUsername = (rule, value, callback) => {
-      if (!isvalidUsername(value)) {
+      if (!validUsername(value)) {
         callback(new Error('Please enter the correct user name'))
       } else {
         callback()