fix: 过滤器屏蔽大小写

pages/admin/userAdmin.vue

@@ -183,9 +183,9 @@ export default {
     filterUser () {
       const filterUsers = []
       this.users.forEach(user => {
-        if (user.name.indexOf(this.filter) !== -1 ||
-          user.phone.indexOf(this.filter) !== -1 ||
-          user.role.indexOf(this.filter) !== -1) {
+        if (user.name.toLowerCase().indexOf(this.filter.toLowerCase()) !== -1 ||
+          user.phone.toLowerCase().indexOf(this.filter.toLowerCase()) !== -1 ||
+          user.role.toLowerCase().indexOf(this.filter.toLowerCase()) !== -1) {
           filterUsers.push(user)
         }
       })