code refactor

src/lib/userstate.js

@@ -0,0 +1,24 @@
+const tokenLocalStorageKey = 'lab_user_token';
+
+function getToken() {
+    return localStorage.getItem(tokenLocalStorageKey);
+}
+
+function isUserLogined() {
+    return !!getToken();
+}
+
+function updateToken(token) {
+    return localStorage.setItem(tokenLocalStorageKey, token);
+}
+
+function clearToken() {
+    return localStorage.removeItem(tokenLocalStorageKey);
+}
+
+export default {
+    getToken,
+    isUserLogined,
+    updateToken,
+    clearToken
+};