first commit

vant/packages/vant-cli/site/common/iframe-router.js

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+/**
+ * 同步父窗口和 iframe 的 vue-router 状态
+ */
+
+import { iframeReady, isMobile } from '.';
+
+window.syncPath = function() {
+  const router = window.vueRouter;
+  const isInIframe = window !== window.top;
+  const currentDir = router.history.current.path;
+
+  if (isInIframe) {
+    window.top.replacePath(currentDir);
+  } else if (!isMobile) {
+    const iframe = document.querySelector('iframe');
+    if (iframe) {
+      iframeReady(iframe, () => {
+        iframe.contentWindow.replacePath(currentDir);
+      });
+    }
+  }
+};
+
+window.replacePath = function(path = '') {
+  // should preserve hash for anchor
+  if (window.vueRouter.currentRoute.path !== path) {
+    window.vueRouter.replace(path).catch(() => {});
+  }
+};