diff --git a/docs/.vuepress/config.js b/docs/.vuepress/config.js
index b40a3a54d27b153fef9ce7f1f2ab82b8eac4c948..1132d850bb8e8516a5ea934a6d59362709bcdc7a 100644
--- a/docs/.vuepress/config.js
+++ b/docs/.vuepress/config.js
@@ -36,6 +36,7 @@ const config = {
     docsDir: 'docs',
     editLinks: true,
     editLinkText: '帮助我们改善此页面！',
+    lastUpdated: '上次更新',
     // smoothScroll: true,
     algolia: {
       apiKey: '2fdcc4e76c8e260671ad70065e60b2e7',
diff --git a/docs/.vuepress/markdown/createMarkdownArray.js b/docs/.vuepress/markdown/createMarkdownArray.js
index f92dcd3fcec99e878ee51a2a30aaed92bef4d58d..efc565cfd58d44b884bc65b77d7980788dad6838 100644
--- a/docs/.vuepress/markdown/createMarkdownArray.js
+++ b/docs/.vuepress/markdown/createMarkdownArray.js
@@ -45,15 +45,13 @@ function createMarkdownArray(contents = [], childrenName = 'children') {
     }
   }
 
-  function removeParent(childs = []) {
+  // 移除最后一项 parent 节点，防止循环引用报错
+  (function removeParent(childs = []) {
     childs.forEach(child => {
       if (child.parent) delete child.parent
       if (child[childrenName]) removeParent(child[childrenName])
     })
-  }
-
-  // 移除最后一项 parent 节点，防止循环引用报错
-  removeParent(markdownArray[markdownArray.length - 1][childrenName])
+  })(markdownArray[markdownArray.length - 1][childrenName])
 
   return markdownArray
 }
diff --git a/docs/.vuepress/theme/components/Navbar.vue b/docs/.vuepress/theme/components/Navbar.vue
index d7e8ae8401e06525b51a2ce2d63bcc8f064a0c99..2f512f510663fd880b1e2046d05b4a8dda035106 100644
--- a/docs/.vuepress/theme/components/Navbar.vue
+++ b/docs/.vuepress/theme/components/Navbar.vue
@@ -121,6 +121,7 @@ export default {
       this.mainNavBar = document.querySelector('.main-navbar')
       this.subNavBar = document.querySelector('.sub-navbar')
       this.pageContainer = document.querySelector('.page')
+      this.vuepressToc = document.querySelector('.vuepress-toc')
       this.navbarHeight = this.navbar.clientHeight
       this.subNavBarHeight = this.subNavBar.clientHeight
       this.mainNavBarHeight = this.mainNavBar.clientHeight
@@ -134,6 +135,7 @@ export default {
       window.removeEventListener('scroll', this.onWindowScroll)
       this.fixedNavbar = false
       this.sideBar && this.sideBar.removeAttribute('style')
+      this.vuepressToc && this.vuepressToc.removeAttribute('style')
       this.navbar && this.navbar.removeAttribute('style')
       this.pageContainer && this.pageContainer.removeAttribute('style')
     },
@@ -144,6 +146,7 @@ export default {
         let sideTop = this.navbarHeight - scrollTop
         sideTop <= this.subNavBarHeight && (sideTop = this.subNavBarHeight)
         this.sideBar && (this.sideBar.style.top = `${sideTop + 1}px`)
+        this.vuepressToc && (this.vuepressToc.style.top = `${sideTop + 1}px`)
       }
 
       if (scrollTop >= this.mainNavBarHeight) {
@@ -182,6 +185,7 @@ export default {
         this.navbarHeight = this.navbar.clientHeight
         this.subNavBarHeight = this.subNavBar.clientHeight
         this.sideBar.style.top = `${this.navbarHeight + 1}px`
+        this.vuepressToc.style.top = `${this.navbarHeight + 1}px`
       })
     }
   }
diff --git a/docs/.vuepress/theme/components/Sticker.vue b/docs/.vuepress/theme/components/Sticker.vue
new file mode 100644
index 0000000000000000000000000000000000000000..e1ac951045547701f04f77ab320a78022981e2ce
--- /dev/null
+++ b/docs/.vuepress/theme/components/Sticker.vue
@@ -0,0 +1,64 @@
+<template>
+	<component
+		:is="tag || 'div'"
+		class="sticker"
+		:class="needFloat ? ['stick-float'] : undefined"
+		:style="needFloat ? { bottom: `${stickBottom}px` } : undefined"
+	>
+		<slot></slot>
+	</component>
+</template>
+
+<script>
+	import { findContainerInVm } from '../util';
+	export default {
+		props: ['stick', 'tag'],
+		data() {
+			return {
+				needFloat: false,
+				stickBottom: 0,
+			};
+		},
+		watch: {
+			stick() {
+				this.unStick();
+				this.stickHandle();
+			},
+		},
+		mounted() {
+			this.stickHandle();
+		},
+		beforeDestroy() {
+			this.unStick();
+		},
+		methods: {
+			stickHandle() {
+				if (!this.stick) return;
+				const stickElement = findContainerInVm(this.stick, this);
+				if (!stickElement) return;
+				this._stickerScroll = () => {
+					const rect = this.$el.getBoundingClientRect();
+					const scrollTop = document.body.scrollTop + document.documentElement.scrollTop;
+					this.needFloat =
+						document.body.offsetHeight - scrollTop - rect.height < stickElement.offsetHeight;
+					this.stickBottom = stickElement.offsetHeight;
+				};
+				this._stickerScroll();
+				window.addEventListener('scroll', this._stickerScroll);
+			},
+			unStick() {
+				this.needFloat = false;
+				this.stickBottom = 0;
+				window.removeEventListener('scroll', this._stickerScroll);
+			},
+		},
+	};
+</script>
+
+<style lang="stylus">
+	.sticker
+	  position fixed
+	  &.stick-float
+	    top auto
+	    position absolute
+</style>
diff --git a/docs/.vuepress/theme/components/Toc.vue b/docs/.vuepress/theme/components/Toc.vue
new file mode 100644
index 0000000000000000000000000000000000000000..b8e6f28ffe8cf429060de3dc57e31e97ae79bb48
--- /dev/null
+++ b/docs/.vuepress/theme/components/Toc.vue
@@ -0,0 +1,166 @@
+<template>
+	<Sticker v-if="visible" class="vuepress-toc" v-bind="$attrs" :style="{ top: initVisibleTop }">
+		<h5>ON THIS PAGE</h5>
+		<div
+			v-for="(item, index) in $page.headers"
+			ref="chairTocItem"
+			:key="index"
+			class="vuepress-toc-item"
+			:class="[`vuepress-toc-h${item.level}`, { active: activeIndex === index }]"
+		>
+			<a :href="`#${item.slug}`" :title="item.title">{{ item.title }}</a>
+		</div>
+	</Sticker>
+</template>
+
+<script>
+	import Sticker from './Sticker.vue';
+	let initTop;
+	// get offset top
+	function getAbsoluteTop(dom) {
+		return dom && dom.getBoundingClientRect
+			? dom.getBoundingClientRect().top +
+					document.body.scrollTop +
+					document.documentElement.scrollTop
+			: 0;
+	}
+	export default {
+		components: {
+			Sticker,
+		},
+		data() {
+			return {
+				activeIndex: 0,
+				initVisibleTop: '0px',
+			};
+		},
+		computed: {
+			visible() {
+				return (
+					this.$frontmatter &&
+					this.$frontmatter.toc !== false 
+          // && !!(this.$page && this.$page.headers && this.$page.headers.length)
+				);
+			},
+		},
+		watch: {
+			activeIndex() {
+				const items = this.$refs.chairTocItem || [];
+				const dom = items[this.activeIndex];
+				if (!dom) return;
+				const rect = dom.getBoundingClientRect();
+				const wrapperRect = this.$el.getBoundingClientRect();
+				const top = rect.top - wrapperRect.top;
+				if (top < 20) {
+					this.$el.scrollTop = this.$el.scrollTop + top - 20;
+				} else if (top + rect.height > wrapperRect.height) {
+					this.$el.scrollTop += rect.top - (wrapperRect.height - rect.height);
+				}
+			},
+			$route() {},
+		},
+		mounted() {
+			// sync visible to parent component
+			const syncVisible = () => {
+				this.$emit('visible-change', this.visible);
+			};
+			syncVisible();
+			this.$watch('visible', syncVisible);
+			// binding event
+			setTimeout(() => this.triggerEvt(), 1000);
+			this._onScroll = () => this.onScroll();
+			this._onHashChange = () => {
+				const hash = decodeURIComponent(location.hash.substring(1));
+				const index = (this.$page.headers || []).findIndex(h => h.slug === hash);
+				if (index >= 0) this.activeIndex = index;
+				const dom = hash && document.getElementById(hash);
+				if (dom) window.scrollTo(0, getAbsoluteTop(dom) - 20);
+			};
+			window.addEventListener('scroll', this._onScroll);
+			// window.addEventListener('hashchange', this._onHashChange);
+		},
+		beforeDestroy() {
+			window.removeEventListener('scroll', this._onScroll);
+			window.removeEventListener('hashchange', this._onHashChange);
+		},
+		methods: {
+			onScroll() {
+				if (initTop === undefined) {
+					initTop = getAbsoluteTop(this.$el);
+				}
+				// update position
+				const scrollTop = document.body.scrollTop + document.documentElement.scrollTop;
+				const headings = this.$page.headers || [];
+				// change active toc with scrolling
+				let i = 0;
+				const addLink = index => {
+					this.activeIndex = index;
+				};
+				for (; i < headings.length; i++) {
+					const dom = document.getElementById(headings[i].slug);
+					const top = getAbsoluteTop(dom);
+					if (top - 50 < scrollTop) {
+						addLink(i);
+					} else {
+						if (!i) addLink(i);
+						break;
+					}
+				}
+			},
+			triggerEvt() {
+				this._onScroll();
+				this._onHashChange();
+			},
+		},
+	};
+</script>
+
+<style lang="stylus">
+	.table-of-contents
+	  display none !important
+	.vuepress-toc
+	  position fixed
+	  display none
+	  max-height 89vh
+	  width $vuepress-toc-width
+	  overflow-y auto
+	  // margin-top $navbarHeight
+	  top 0
+	  right 0
+	  box-sizing border-box
+	  background-color #fff
+	  /* background: #fff; */
+	  z-index 0
+	  .vuepress-toc-item
+	    position relative
+	    padding 0.1rem 0.6rem 0.1rem 1.5rem
+	    line-height 1.5rem
+	    border-left 2px solid rgba(0, 0, 0, 0.08)
+	    overflow hidden
+	    a
+	      display block
+	      color $textColor
+	      width 100%
+	      box-sizing border-box
+	      font-size 14px
+	      font-weight 400
+	      text-decoration none
+	      transition color 0.3s
+	      overflow hidden
+	      text-overflow ellipsis
+	      white-space nowrap
+	    &.active
+	      border-left-color $accentColor
+	      a
+	        color $accentColor
+	    &:hover
+	      a
+	        color $accentColor
+	  for i in range(3, 6)
+	    .vuepress-toc-h{i} a
+	      padding-left 1rem * (i - 2)
+	// for vuepress-toc
+	@media (min-width: 1300px)
+	  .vuepress-toc
+	    display block
+</style>
diff --git a/docs/.vuepress/theme/layouts/Layout.vue b/docs/.vuepress/theme/layouts/Layout.vue
index b2e594975fce7e9adab3d8f71dbb6f71b7470213..687a0718693fc402adfed36418487cd1f857fbb0 100644
--- a/docs/.vuepress/theme/layouts/Layout.vue
+++ b/docs/.vuepress/theme/layouts/Layout.vue
@@ -43,6 +43,8 @@
         <Footer />
       </template>
     </Page>
+
+    <Toc />
   </div>
 </template>
 
@@ -53,6 +55,7 @@ import Page from '@theme/components/Page.vue'
 import Sidebar from '@theme/components/Sidebar.vue'
 import Footer from '@theme/components/Footer.vue';
 import SiderBarBottom from '../components/SiderBarBottom.vue';
+import Toc from '../components/Toc';
 import { resolveSidebarItems, forbidScroll, BaiduStat } from '../util'
 import navProvider from '../mixin/navProvider';
 
@@ -65,7 +68,8 @@ export default {
     Sidebar,
     Navbar,
     Footer,
-    SiderBarBottom
+    SiderBarBottom,
+    Toc
   },
   data () {
     return {
diff --git a/docs/.vuepress/theme/styles/index.styl b/docs/.vuepress/theme/styles/index.styl
index c5e2831497671c23fc80576e35688b517a64166d..73f99c6f5a00a84cca257ae6aa42aca2dda267b1 100644
--- a/docs/.vuepress/theme/styles/index.styl
+++ b/docs/.vuepress/theme/styles/index.styl
@@ -81,6 +81,11 @@ body.forbid_scroll
 
 main.page
 	padding-bottom 0px
+	padding-right 0px
+	
+	@media (min-width: 1300px)
+		&
+			padding-right $vuepress-toc-width
 
 {$contentClass}:not(.custom) 
 	> *:first-child
diff --git a/docs/.vuepress/theme/styles/palette.styl b/docs/.vuepress/theme/styles/palette.styl
index 82b9623dbbd42d8cb6a971fe6401d4bca732e768..eb2970ff54a7b529fce2f9c5723714549b25e393 100644
--- a/docs/.vuepress/theme/styles/palette.styl
+++ b/docs/.vuepress/theme/styles/palette.styl
@@ -4,4 +4,5 @@ $contentWidth = 1200px
 $navbarHeight = 9rem
 $navbar-sub-navbar-height = 5rem
 $navbar-background-color = #f7f7f7
-$search-container-color = #f5f6f7
\ No newline at end of file
+$search-container-color = #f5f6f7
+$vuepress-toc-width = 220px
\ No newline at end of file
diff --git a/docs/.vuepress/theme/util/index.js b/docs/.vuepress/theme/util/index.js
index 50948fc9e9c14911f2f6bc08b78b51a833b01862..f73dbdc99bd6bce89d57a84c157b7b211125aca2 100644
--- a/docs/.vuepress/theme/util/index.js
+++ b/docs/.vuepress/theme/util/index.js
@@ -300,4 +300,25 @@ export function debounce(fn, delay) {
     clearTimeout(timeout)
   }
   return newFn
+}
+
+/*
+ * find parent vm by ref
+ * @param {String} ref
+ * @param {Vue} vm
+ * @param {any} def default value
+ * @returns {Element}
+ */
+export function findContainerInVm(ref, vm, def) {
+  if (!ref) return def
+  let container
+  let parent = vm
+  while ((parent = parent.$parent) && !container) {
+    container = parent.$refs[ref]
+  }
+  // Ensure it's html element (ref could be component)
+  if (container && container.$el) {
+    container = container.$el
+  }
+  return container || def
 }
\ No newline at end of file