Do not use router if not cn region. (#315)

* Do not use router if not cn region.

* codereview fix

Author: wangxiao

demo/test-es6.js

@@ -8,12 +8,13 @@
 
 'use strict';
 
-let global = global || window;
-let AV = global.AV || {};
+let av;
 
 // 检测是否在 Nodejs 环境下运行
 if (typeof(process) !== 'undefined' && process.versions && process.versions.node) {
-  AV = require('../dist/node/av');
+  av = require('../dist/node/av');
+} else {
+  av = window.AV;
 }
 
 // 初始化
@@ -25,10 +26,10 @@ const region = 'cn';
 // const appKey = 'be2YmUduiuEnCB2VR9bLRnnV';
 // const region = 'us';
 
-AV.init({ appId, appKey, region });
+av.init({ appId, appKey, region });
 
 // 基本存储
-const TestClass = AV.Object.extend('TestClass');
+const TestClass = av.Object.extend('TestClass');
 const testObj = new TestClass();
 testObj.set({
   name: 'hjiang',
@@ -44,7 +45,7 @@ testObj.save().then(() => {
 
 // 存储文件
 const base64 = 'd29ya2luZyBhdCBhdm9zY2xvdWQgaXMgZ3JlYXQh';
-const file = new AV.File('myfile.txt', { base64 });
+const file = new av.File('myfile.txt', { base64 });
 file.metaData('format', 'txt file');
 file.save().then(() => {
   console.log(file.get('url'));
@@ -53,7 +54,7 @@ file.save().then(() => {
 });
 
 // 查找文件
-const query = new AV.Query(TestClass);
+const query = new av.Query(TestClass);
 query.equalTo('name', 'hjiang');
 query.find().then((list) => {
   console.log(list);

src/request.js

@@ -235,7 +235,7 @@ const setServerUrl = (serverURL) => {
   }
 };
 
-const refreshServerUrl = () => {
+const refreshServerUrlByRouter = () => {
   const url = `https://app-router.leancloud.cn/1/route?appId=${AV.applicationId}`;
   return ajax('get', url).then(servers => {
     if (servers.api_server) {
@@ -248,21 +248,28 @@ const refreshServerUrl = () => {
 const setServerUrlByRegion = (region = 'cn') => {
   // 如果用户在 init 之前设置了 APIServerURL，则跳过请求 router
   if (AV._config.APIServerURL) {
+    getServerURLPromise.resolve();
     return;
   }
-  AV._config.region = region;
-  AV._config.APIServerURL = API_HOST[region];
-
-  Cache.getAsync('APIServerURL').then((serverURL) => {
-    if (serverURL) {
-      setServerUrl(serverURL);
-      getServerURLPromise.resolve();
-    } else {
-      refreshServerUrl().then(() => {
+  // if not china server region, do not use router
+  if (region === 'cn') {
+    Cache.getAsync('APIServerURL').then((serverURL) => {
+      if (serverURL) {
+        setServerUrl(serverURL);
         getServerURLPromise.resolve();
-      });
-    }
-  });
+      } else {
+        return refreshServerUrlByRouter();
+      }
+    }).then(() => {
+      getServerURLPromise.resolve();
+    }).catch(() => {
+      getServerURLPromise.reject();
+    });
+  } else {
+    AV._config.region = region;
+    AV._config.APIServerURL = API_HOST[region];
+    getServerURLPromise.resolve();
+  }
 };
 
 /**