first commit

vant/packages/vant-cli/site/common/locales.js

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+const ZH_CN = 'zh-CN';
+const EN_US = 'en-US';
+const CACHE_KEY = 'vant-cli-lang';
+
+let currentLang = ZH_CN;
+
+export function getLang() {
+  return currentLang;
+}
+
+export function setLang(lang) {
+  currentLang = lang;
+  localStorage.setItem(CACHE_KEY, lang);
+}
+
+export function setDefaultLang(langFromConfig) {
+  const cached = localStorage.getItem(CACHE_KEY);
+
+  if (cached) {
+    currentLang = cached;
+    return;
+  }
+
+  if (navigator.language && navigator.language.indexOf('zh-') !== -1) {
+    currentLang = ZH_CN;
+    return;
+  }
+
+  currentLang = langFromConfig || EN_US;
+}