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src/locale/index.js

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+import defaultLang from 'element-ui/src/locale/lang/zh-CN';
+import Vue from 'vue';
+import deepmerge from 'deepmerge';
+import Format from './format';
+
+const format = Format(Vue);
+let lang = defaultLang;
+let merged = false;
+let i18nHandler = function() {
+  const vuei18n = Object.getPrototypeOf(this || Vue).$t;
+  if (typeof vuei18n === 'function' && !!Vue.locale) {
+    if (!merged) {
+      merged = true;
+      Vue.locale(
+        Vue.config.lang,
+        deepmerge(lang, Vue.locale(Vue.config.lang) || {}, { clone: true })
+      );
+    }
+    return vuei18n.apply(this, arguments);
+  }
+};
+
+export const t = function(path, options) {
+  let value = i18nHandler.apply(this, arguments);
+  if (value !== null && value !== undefined) return value;
+
+  const array = path.split('.');
+  let current = lang;
+
+  for (let i = 0, j = array.length; i < j; i++) {
+    const property = array[i];
+    value = current[property];
+    if (i === j - 1) return format(value, options);
+    if (!value) return '';
+    current = value;
+  }
+  return '';
+};
+
+export const use = function(l) {
+  lang = l || lang;
+};
+
+export const i18n = function(fn) {
+  i18nHandler = fn || i18nHandler;
+};
+
+export default { use, t, i18n };