code refactor

src/lib/userstate.js

@@ -1,3 +1,5 @@
+import utils from './utils.js'
+
 const tokenLocalStorageKey = 'lab_user_token';
 const userInfoLocalStorageKey = 'lab_user_info';
 
@@ -15,19 +17,19 @@ function isUserLogined() {
 }
 
 function updateToken(token) {
-    if (typeof(token) === 'string') {
+    if (utils.isString(token)) {
         localStorage.setItem(tokenLocalStorageKey, token);
     }
 }
 
 function updateUserInfo(user) {
-    if (typeof(user) === 'object') {
+    if (utils.isObject(user)) {
         localStorage.setItem(userInfoLocalStorageKey, JSON.stringify(user));
     }
 }
 
 function updateTokenAndUserInfo(item) {
-    if (typeof(item) === 'object') {
+    if (utils.isObject(item)) {
         if (item.token) {
             updateToken(item.token);
         }

src/lib/utils.js

@@ -0,0 +1,36 @@
+function isFunction(val) {
+    return typeof(val) === 'function';
+}
+
+function isObject(val) {
+    return val != null && typeof(val) === 'object';
+}
+
+function isArray(val) {
+    if (isFunction(Array.isArray)) {
+        return Array.isArray(val);
+    }
+
+    return Object.prototype.toString.call(val) === '[object Array]';
+}
+
+function isString(val) {
+    return typeof(val) === 'string';
+}
+
+function isNumber(val) {
+    return typeof(val) === 'number';
+}
+
+function isBoolean(val) {
+    return typeof(val) === 'boolean';
+}
+
+export default {
+    isFunction,
+    isObject,
+    isArray,
+    isString,
+    isNumber,
+    isBoolean,
+};