update to 4.0

docs-src/assets/auto-lang.js

@@ -0,0 +1,23 @@
+/* eslint no-var: off */
+/**
+* detect if the browser is in UTF-8 zone
+* @return boolean
+*/
+function isUTF8Zone() {
+  return new Date().getTimezoneOffset() === -480;
+}
+
+/**
+* detect if the browser is already in a locale view
+*/
+function isInLocaleView() {
+  return /(cn|en)/i.test(location.href);
+}
+
+function initDefaultLocaleAndStatic() {
+  if (!isInLocaleView()) {
+    location.href = isUTF8Zone() ? '/cn' : 'en';
+  }
+}
+
+initDefaultLocaleAndStatic();