Merge branch 'dev' into next

packages/vant-cli/site/common/style/base.less

@@ -6,7 +6,9 @@ body {
   overflow-x: auto;
   color: @van-doc-black;
   font-size: 16px;
-  font-family: PingFang SC, 'Helvetica Neue', Arial, sans-serif;
+  font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Helvetica,
+    Segoe UI, Arial, Roboto, 'PingFang SC', 'Hiragino Sans GB',
+    'Microsoft Yahei', sans-serif;
   background-color: @van-doc-background-color;
   -webkit-font-smoothing: antialiased;
 }

packages/vant-cli/site/desktop/utils.js

@@ -4,9 +4,7 @@ export function scrollToAnchor(selector) {
   const timer = setInterval(() => {
     const el = document.querySelector(selector);
     if (el) {
-      el.scrollIntoView({
-        behavior: 'smooth',
-      });
+      el.scrollIntoView();
       clearInterval(timer);
     } else {
       count++;

packages/vant-cli/site/mobile/components/DemoNav.vue

@@ -39,9 +39,10 @@ export default {
 <style lang="less">
 .demo-nav {
   position: relative;
+  display: flex;
+  align-items: center;
+  justify-content: center;
   height: 56px;
-  line-height: 56px;
-  text-align: center;
   background-color: #fff;
 
   &__title {