[Improvement] optimize utils (#661)

packages/utils/create.js

@@ -8,10 +8,10 @@ import install from './install';
 import Loading from '../loading';
 
 export default function(sfc) {
-  sfc.mixins = sfc.mixins || [];
-  sfc.components = sfc.components || {};
   sfc.install = sfc.install || install;
+  sfc.mixins = sfc.mixins || [];
   sfc.mixins.push(i18n);
+  sfc.components = sfc.components || {};
   sfc.components.icon = Icon;
   sfc.components.loading = Loading;
 

packages/utils/deep-assign.js

@@ -1,12 +1,7 @@
-import { isDef } from './';
+import { isDef, isObj } from './';
 
 const { hasOwnProperty } = Object.prototype;
 
-function isObj(x) {
-  const type = typeof x;
-  return x !== null && (type === 'object' || type === 'function');
-}
-
 function assignKey(to, from, key) {
   const val = from[key];
 

packages/utils/index.js

@@ -7,6 +7,11 @@ function isDef(value) {
   return value !== undefined && value !== null;
 }
 
+function isObj(x) {
+  const type = typeof x;
+  return x !== null && (type === 'object' || type === 'function');
+}
+
 function get(object, path) {
   const keys = path.split('.');
   let result = object;
@@ -30,6 +35,7 @@ function isAndroid() {
 
 export {
   get,
+  isObj,
   isDef,
   create,
   isServer,