feat(cli): support switch lang

packages/vant-cli/site/desktop/components/Simulator.vue

@@ -9,7 +9,8 @@ export default {
   name: 'van-doc-simulator',
 
   props: {
-    src: String
+    src: String,
+    lang: String
   },
 
   data() {
@@ -32,6 +33,12 @@ export default {
     }
   },
 
+  watch: {
+    lang(val) {
+      location.hash = `#${location.hash.replace(this.lang, val)}`;
+    }
+  },
+
   mounted() {
     window.addEventListener('scroll', () => {
       this.scrollTop = window.scrollY;