diff --git a/babel.config.js b/babel.config.js
index fbaa638c..03a17be7 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -4,9 +4,8 @@ module.exports = {
       '@babel/preset-env',
       {
         loose: true,
-        modules: false
-      }
-    ]
+        modules: false,
+      },
+    ],
   ],
-  plugins: ['@babel/plugin-syntax-dynamic-import']
 };
diff --git a/build/webpack.doc.dev.js b/build/webpack.doc.dev.js
deleted file mode 100644
index 1370fded..00000000
--- a/build/webpack.doc.dev.js
+++ /dev/null
@@ -1,81 +0,0 @@
-const path = require('path');
-const HtmlWebpackPlugin = require('html-webpack-plugin');
-const ProgressBarPlugin = require('progress-bar-webpack-plugin');
-const { VueLoaderPlugin } = require('vue-loader');
-
-module.exports = {
-  mode: 'development',
-  entry: {
-    'vant-docs': './docs/src/index.js',
-    'vant-preview': './docs/src/preview.js',
-  },
-  output: {
-    path: path.join(__dirname, '../docs/dist'),
-    publicPath: '/',
-    chunkFilename: 'async_[name].js',
-  },
-  stats: {
-    modules: false,
-    children: false,
-  },
-  serve: {
-    open: true,
-    host: '0.0.0.0',
-    devMiddleware: {
-      logLevel: 'warn',
-    },
-    hotClient: {
-      logLevel: 'warn',
-      allEntries: true,
-    },
-  },
-  resolve: {
-    extensions: ['.js', '.vue', '.css'],
-  },
-  module: {
-    rules: [
-      {
-        test: /\.vue$/,
-        use: [
-          {
-            loader: 'vue-loader',
-            options: {
-              compilerOptions: {
-                preserveWhitespace: false,
-              },
-            },
-          },
-        ],
-      },
-      {
-        test: /\.js$/,
-        exclude: /node_modules/,
-        use: 'babel-loader',
-      },
-      {
-        test: /\.(css|less)$/,
-        use: ['style-loader', 'css-loader', 'postcss-loader', 'less-loader'],
-      },
-      {
-        test: /\.md$/,
-        use: ['vue-loader', '@vant/markdown-loader'],
-      },
-    ],
-  },
-  plugins: [
-    new VueLoaderPlugin(),
-    new ProgressBarPlugin(),
-    new HtmlWebpackPlugin({
-      chunks: ['vant-docs'],
-      template: 'docs/src/index.tpl',
-      filename: 'index.html',
-      inject: true,
-    }),
-    new HtmlWebpackPlugin({
-      chunks: ['vant-preview'],
-      template: 'docs/src/index.tpl',
-      filename: 'preview.html',
-      inject: true,
-    }),
-  ],
-};
diff --git a/build/webpack.doc.prd.js b/build/webpack.doc.prd.js
deleted file mode 100644
index ae625e80..00000000
--- a/build/webpack.doc.prd.js
+++ /dev/null
@@ -1,14 +0,0 @@
-const path = require('path');
-const config = require('./webpack.doc.dev.js');
-
-delete config.serve;
-
-module.exports = Object.assign(config, {
-  mode: 'production',
-  output: {
-    path: path.join(__dirname, '../docs/dist'),
-    publicPath: 'https://b.yzcdn.cn/vant-weapp/',
-    filename: '[name].[hash:8].js',
-    chunkFilename: 'async_[name].[chunkhash:8].js',
-  },
-});
diff --git a/docs/src/App.vue b/docs/src/App.vue
deleted file mode 100644
index 6fc1fd65..00000000
--- a/docs/src/App.vue
+++ /dev/null
@@ -1,85 +0,0 @@
-<template>
-  <van-doc
-    active="小程序组件"
-    :config="config"
-    :github="github"
-    :versions="versions"
-    :simulator="simulator"
-    @switch-version="onSwitchVersion"
-  >
-    <router-view />
-  </van-doc>
-</template>
-
-<script>
-import pkgJson from '../../package.json';
-import docConfig, { github, versions } from './doc.config';
-
-const UNSHARED = ['common', 'quickstart', 'changelog', 'intro', 'transition'];
-
-export default {
-  data() {
-    return {
-      github,
-      versions,
-    };
-  },
-
-  computed: {
-    config() {
-      return docConfig;
-    },
-
-    simulator() {
-      let prefix = '';
-      const { path } = this.$route.meta;
-
-      if (
-        location.hostname === '0.0.0.0' ||
-        location.hostname === 'localhost'
-      ) {
-        prefix = 'https://youzan.github.io';
-      }
-
-      if (!UNSHARED.includes(path)) {
-        return `${prefix}/vant/mobile.html?hide_nav=1&weapp=1#/zh-CN/${path}`;
-      }
-
-      return `./preview.html#${path}`;
-    },
-  },
-
-  methods: {
-    onSwitchVersion(version) {
-      if (version !== pkgJson.version) {
-        location.href = `https://youzan.github.io/vant-weapp/${version}`;
-      }
-    },
-  },
-};
-</script>
-
-<style lang="less">
-.van-doc-intro {
-  padding-top: 20px;
-  font-family: 'Dosis', 'Source Sans Pro', 'Helvetica Neue', Arial, sans-serif;
-  text-align: center;
-
-  &__logo {
-    width: 120px;
-    height: 120px;
-  }
-
-  h2 {
-    font-weight: normal;
-    font-size: 32px;
-    line-height: 60px;
-  }
-
-  p {
-    margin-bottom: 20px;
-    color: #455a64;
-    font-size: 15px;
-  }
-}
-</style>
diff --git a/docs/src/Preview.vue b/docs/src/Preview.vue
deleted file mode 100644
index 264729c1..00000000
--- a/docs/src/Preview.vue
+++ /dev/null
@@ -1,99 +0,0 @@
-<template>
-  <div>
-    <img
-      :class="['preview-image', `preview-image--${imageName}`]"
-      :src="image"
-    />
-    <div class="preview-popup">
-      <div class="preview-content">
-        <img src="https://img.yzcdn.cn/vant-weapp/qrcode-201808101114.jpg" />
-        <p>微信扫码体验</p>
-      </div>
-    </div>
-  </div>
-</template>
-
-<script>
-const PREFIX = 'https://img.yzcdn.cn/vant-weapp/';
-const MAP = {
-  index: 'index-20190715.png',
-  transition: 'transition-20180821.png',
-};
-
-export default {
-  computed: {
-    imageName() {
-      return location.hash.slice(1);
-    },
-    image() {
-      return PREFIX + (MAP[this.imageName] || MAP.index);
-    },
-  },
-};
-</script>
-
-<style lang="less">
-body {
-  margin: 0;
-  color: #323233;
-  font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Helvetica,
-    Segoe UI, Arial, Roboto, 'PingFang SC', 'miui', 'Hiragino Sans GB',
-    'Microsoft Yahei', sans-serif;
-  line-height: 1;
-  background-color: #f7f8fa;
-  -webkit-font-smoothing: antialiased;
-}
-
-.preview {
-  &-image {
-    display: block;
-    width: 100%;
-
-    &--transition {
-      margin-top: -62px;
-    }
-  }
-
-  &-popup {
-    position: fixed;
-    top: 0;
-    left: 0;
-    z-index: 1;
-    width: 100%;
-    height: 100%;
-    text-align: center;
-    background-color: rgba(255, 255, 255, 0.95);
-    opacity: 0;
-    transition: 0.3s;
-
-    &:hover {
-      opacity: 1;
-    }
-  }
-
-  &-content {
-    position: absolute;
-    top: 50%;
-    left: 0;
-    width: 100%;
-    height: 200px;
-    text-align: center;
-    transform: translateY(-60%);
-    user-select: none;
-
-    img {
-      display: inline-block;
-      width: 180px;
-      height: 180px;
-      margin-bottom: 15px;
-    }
-
-    p {
-      margin: 0;
-      color: #34495e;
-      font-size: 16px;
-      line-height: 1.5;
-    }
-  }
-}
-</style>
diff --git a/docs/src/doc.config.js b/docs/src/doc.config.js
deleted file mode 100644
index 4fad680b..00000000
--- a/docs/src/doc.config.js
+++ /dev/null
@@ -1,74 +0,0 @@
-/* eslint-disable */
-import packageJson from '../../package.json';
-import components from '../../example/config';
-const { version } = packageJson;
-
-export const github = 'https://github.com/youzan/vant-weapp';
-
-export const versions = [version, '0.x'];
-
-export default {
-  header: {
-    logo: {
-      image: 'https://img.yzcdn.cn/vant/logo.png',
-      title: 'Vant Weapp',
-      href: '#/',
-    },
-    nav: {
-      logoLink: [
-        {
-          image: 'https://img.yzcdn.cn/vant/vant-o.svg',
-          url: '/vant',
-        },
-        {
-          image: 'https://img.yzcdn.cn/vant/logo/github.svg',
-          url: github,
-        },
-      ],
-    },
-  },
-  nav: [
-    {
-      name: '开发指南',
-      groups: [
-        {
-          list: [
-            {
-              path: '/intro',
-              title: '介绍',
-              md: true,
-            },
-            {
-              path: '/quickstart',
-              title: '快速上手',
-              md: true,
-            },
-            {
-              path: '/changelog',
-              title: '更新日志',
-              md: true,
-            },
-            {
-              path: '/common',
-              title: '内置样式',
-            },
-            {
-              path: '/custom-style',
-              title: '样式覆盖',
-              md: true,
-            },
-            {
-              path: '/theme',
-              title: '定制主题',
-              md: true,
-            },
-          ],
-        },
-      ],
-    },
-    {
-      name: '组件',
-      groups: components,
-    },
-  ],
-};
diff --git a/docs/src/index.js b/docs/src/index.js
deleted file mode 100644
index 4a49448b..00000000
--- a/docs/src/index.js
+++ /dev/null
@@ -1,55 +0,0 @@
-import Vue from 'vue';
-import VueRouter from 'vue-router';
-import App from './App';
-import routes from './router';
-import VantDoc from '@vant/doc';
-
-Vue.use(VueRouter).use(VantDoc);
-
-const router = new VueRouter({
-  mode: 'hash',
-  routes: routes(),
-  scrollBehavior(to) {
-    if (to.hash) {
-      return { selector: to.hash };
-    }
-
-    return { x: 0, y: 0 };
-  },
-});
-
-const ua = navigator.userAgent.toLowerCase();
-const isMobile = /ios|iphone|ipod|ipad|android/.test(ua);
-
-router.beforeEach((route, redirect, next) => {
-  if (isMobile) {
-    location.replace('/vant/mobile.html?weapp=1');
-  }
-
-  next();
-});
-
-router.afterEach(() => {
-  window.scrollTo(0, 0);
-});
-
-Vue.config.productionTip = false;
-
-new Vue({
-  el: '#app',
-  mounted() {
-    setTimeout(() => {
-      // wait page init
-      if (this.$route.hash) {
-        const el = document.querySelector(this.$route.hash);
-        if (el) {
-          el.scrollIntoView({
-            behavior: 'smooth',
-          });
-        }
-      }
-    }, 1000);
-  },
-  render: (h) => h(App),
-  router,
-});
diff --git a/docs/src/preview.js b/docs/src/preview.js
deleted file mode 100644
index fc14e942..00000000
--- a/docs/src/preview.js
+++ /dev/null
@@ -1,9 +0,0 @@
-import Vue from 'vue';
-import Preview from './Preview.vue';
-
-Vue.config.productionTip = false;
-
-new Vue({
-  el: '#app',
-  render: (h) => h(Preview),
-});
diff --git a/docs/src/router.js b/docs/src/router.js
deleted file mode 100644
index eecb7469..00000000
--- a/docs/src/router.js
+++ /dev/null
@@ -1,52 +0,0 @@
-import docConfig from './doc.config';
-
-const registerRoute = () => {
-  const route = [
-    {
-      path: '*',
-      redirect: () => `/intro`,
-    },
-  ];
-
-  const navs = docConfig.nav || [];
-
-  function addRoute(page) {
-    let { path } = page;
-    if (path) {
-      path = path.replace('/', '');
-
-      const component = () =>
-        page.md
-          ? import(`../markdown/${path}.md`)
-          : import(`../../packages/${path}/README.md`);
-
-      if (!component) {
-        return;
-      }
-
-      route.push({
-        name: '/' + path,
-        component,
-        path: `/${path}`,
-        meta: {
-          path,
-          name: page.title,
-        },
-      });
-    }
-  }
-
-  navs.forEach((nav) => {
-    if (nav.groups) {
-      nav.groups.forEach((group) => {
-        group.list.forEach((page) => addRoute(page));
-      });
-    } else {
-      addRoute(nav);
-    }
-  });
-
-  return route;
-};
-
-export default registerRoute;
diff --git a/package.json b/package.json
index 218a261f..95820c71 100644
--- a/package.json
+++ b/package.json
@@ -47,6 +47,7 @@
     "gulp-rename": "^2.0.0",
     "miniprogram-api-typings": "^3.1.6",
     "miniprogram-ci": "^1.0.27",
+    "less": "^3.0.0",
     "tscpaths": "^0.0.9",
     "vue": "^3.0.0",
     "@vue/compiler-sfc": "^3.0.0"
diff --git a/yarn.lock b/yarn.lock
index bc55b2c1..c088f0f8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10264,6 +10264,22 @@ less-loader@^7.2.1:
     native-request "^1.0.5"
     source-map "~0.6.0"
 
+less@^3.0.0:
+  version "3.13.1"
+  resolved "https://registry.npmjs.org/less/-/less-3.13.1.tgz#0ebc91d2a0e9c0c6735b83d496b0ab0583077909"
+  integrity sha512-SwA1aQXGUvp+P5XdZslUOhhLnClSLIjWvJhmd+Vgib5BFIr9lMNlQwmwUNOjXThF/A0x+MCYYPeWEfeWiLRnTw==
+  dependencies:
+    copy-anything "^2.0.1"
+    tslib "^1.10.0"
+  optionalDependencies:
+    errno "^0.1.1"
+    graceful-fs "^4.1.2"
+    image-size "~0.5.0"
+    make-dir "^2.1.0"
+    mime "^1.4.1"
+    native-request "^1.0.5"
+    source-map "~0.6.0"
+
 less@^4.1.0:
   version "4.1.1"
   resolved "https://registry.npm.taobao.org/less/download/less-4.1.1.tgz?cache=0&sync_timestamp=1612065678706&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fless%2Fdownload%2Fless-4.1.1.tgz#15bf253a9939791dc690888c3ff424f3e6c7edba"