[Build] use vue-cli to build site (#3734)

docs/site/utils/iframe-router.js

@@ -1,36 +0,0 @@
-/**
- * 同步父窗口和 iframe 的 vue-router 状态
- */
-
-import { setLang } from './lang';
-import { iframeReady, isMobile } from '.';
-
-export function initIframeRouter() {
-  window.syncPath = function () {
-    const router = window.vueRouter;
-    const isInIframe = window !== window.top;
-    const currentDir = router.history.current.path;
-    const pathParts = currentDir.split('/');
-    let lang = pathParts[0];
-    if (currentDir[0] === '/') {
-      lang = pathParts[1];
-    }
-
-    if (!isInIframe && !isMobile) {
-      const iframe = document.querySelector('iframe');
-      if (iframe) {
-        iframeReady(iframe, () => {
-          iframe.contentWindow.changePath(lang, currentDir);
-        });
-      }
-      setLang(lang);
-    } else if (isInIframe) {
-      window.top.changePath(lang, currentDir);
-    }
-  };
-
-  window.changePath = function (lang, path = '') {
-    setLang(lang);
-    window.vueRouter.replace(path);
-  };
-}