diff --git a/.github/workflows/wangdoc.yml b/.github/workflows/wangdoc.yml
index 80f8bfe..c3e5cbe 100644
--- a/.github/workflows/wangdoc.yml
+++ b/.github/workflows/wangdoc.yml
@@ -10,28 +10,27 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           persist-credentials: false
       - name: Setup Node.js
-        uses: actions/setup-node@main
+        uses: actions/setup-node@v4
         with:
-          node-version: '14'
+          node-version: 'latest'
       - name: Install dependencies
         run: npm install
       - name: Build pages
         run: npm run build
       - name: Deploy to website
-        uses: JamesIves/github-pages-deploy-action@3.7.1
+        uses: JamesIves/github-pages-deploy-action@v4
         with:
-          GIT_CONFIG_NAME: wangdoc-bot
-          GIT_CONFIG_EMAIL: yifeng.ruan@gmail.com
-          REPOSITORY_NAME: wangdoc/website
-          ACCESS_TOKEN: ${{ secrets.WANGDOC_BOT_TOKEN }}
-          BASE_BRANCH: master
-          BRANCH: master # The branch the action should deploy to.
-          FOLDER: dist # The folder the action should deploy.
-          TARGET_FOLDER: dist/javascript
-          CLEAN: true # Automatically remove deleted files from the deploy branch
-          COMMIT_MESSAGE: update from JavaScript tutorial
+          git-config-name: wangdoc-bot
+          git-config-email: yifeng.ruan@gmail.com
+          repository-name: wangdoc/website
+          token: ${{ secrets.WANGDOC_BOT_TOKEN }}
+          branch: master # The branch the action should deploy to.
+          folder: dist # The folder the action should deploy.
+          target-folder: dist/javascript
+          clean: true # Automatically remove deleted files from the deploy branch
+          commit-message: update from JavaScript tutorial
 
diff --git a/docs/async/general.md b/docs/async/general.md
index a4c9747..a745bfe 100644
--- a/docs/async/general.md
+++ b/docs/async/general.md
@@ -271,7 +271,7 @@ function launcher() {
       running--;
       if(items.length > 0) {
         launcher();
-      } else if(running == 0) {
+      } else if(running === 0) {
         final(results);
       }
     });
diff --git a/docs/async/promise.md b/docs/async/promise.md
index 68b5c07..cb629d7 100644
--- a/docs/async/promise.md
+++ b/docs/async/promise.md
@@ -274,7 +274,7 @@ console.log(3);
 
 ## 参考链接
 
-- Sebastian Porto, [Asynchronous JS: Callbacks, Listeners, Control Flow Libs and Promises](http://sporto.github.com/blog/2012/12/09/callbacks-listeners-promises/)
+- Sebastian Porto, [Asynchronous JS: Callbacks, Listeners, Control Flow Libs and Promises](https://sporto.github.io/blog/2012/12/09/callbacks-listeners-promises/)
 - Rhys Brett-Bowen, [Promises/A+ - understanding the spec through implementation](http://modernjavascript.blogspot.com/2013/08/promisesa-understanding-by-doing.html)
 - Matt Podwysocki, Amanda Silver, [Asynchronous Programming in JavaScript with “Promises”](http://blogs.msdn.com/b/ie/archive/2011/09/11/asynchronous-programming-in-javascript-with-promises.aspx)
 - Marc Harter, [Promise A+ Implementation](https://gist.github.com//wavded/5692344)
diff --git a/docs/basic/grammar.md b/docs/basic/grammar.md
index 1611427..b0dea02 100644
--- a/docs/basic/grammar.md
+++ b/docs/basic/grammar.md
@@ -485,7 +485,7 @@ var msg = '数字' + n + '是' + (n % 2 === 0 ? '偶数' : '奇数');
 
 ### while 循环
 
-`While`语句包括一个循环条件和一段代码块，只要条件为真，就不断循环执行代码块。
+`while`语句包括一个循环条件和一段代码块，只要条件为真，就不断循环执行代码块。
 
 ```javascript
 while (条件)
@@ -727,4 +727,4 @@ top:
 
 ## 参考链接
 
-- Axel Rauschmayer, [A quick overview of JavaScript](http://www.2ality.com/2011/10/javascript-overview.html)
+- Axel Rauschmayer, [Basic JavaScript for the impatient programmer](https://2ality.com/2013/06/basic-javascript.html)
diff --git a/docs/basic/history.md b/docs/basic/history.md
index 0c03d6d..f5c266b 100644
--- a/docs/basic/history.md
+++ b/docs/basic/history.md
@@ -181,7 +181,7 @@ JavaScript 伴随着互联网的发展一起发展。互联网周边技术的快
 
 ## 参考链接
 
-- Axel Rauschmayer, [The Past, Present, and Future of JavaScript](http://oreilly.com/javascript/radarreports/past-present-future-javascript.csp)
+- Axel Rauschmayer, [The Past, Present, and Future of JavaScript](https://www.oreilly.com/library/view/the-past-present/9781449343545/)
 - John Dalziel, [The race for speed part 4: The future for JavaScript](http://creativejs.com/2013/06/the-race-for-speed-part-4-the-future-for-javascript/)
-- Axel Rauschmayer, [Basic JavaScript for the impatient programmer](http://www.2ality.com/2013/06/basic-javascript.html)
-- resin.io, [Happy 18th Birthday JavaScript! A look at an unlikely past and bright future](http://resin.io/happy-18th-birthday-javascript/)
+- Axel Rauschmayer, [Basic JavaScript for the impatient programmer](https://www.2ality.com/2013/06/basic-javascript.html)
+- balena.io, [Happy 18th Birthday JavaScript! A look at an unlikely past and bright future](https://www.balena.io/blog/happy-18th-birthday-javascript/)
diff --git a/docs/bom/cookie.md b/docs/bom/cookie.md
index 80c542c..e0ae045 100644
--- a/docs/bom/cookie.md
+++ b/docs/bom/cookie.md
@@ -342,7 +342,7 @@ document.cookie = "foo=bar; expires=Fri, 31 Dec 2020 23:59:59 GMT";
 各个属性的写入注意点如下。
 
 - `path`属性必须为绝对路径，默认为当前路径。
-- `domain`属性值必须是当前发送 Cookie 的域名的一部分。比如，当前域名是`example.com`，就不能将其设为`foo.com`。该属性默认为当前的一级域名（不含二级域名）。
+- `domain`属性值必须是当前发送 Cookie 的域名的一部分。比如，当前域名是`example.com`，就不能将其设为`foo.com`。该属性默认为当前的一级域名（不含二级域名）。如果显式设置该属性，则该域名的任意子域名也可以读取 Cookie。
 - `max-age`属性的值为秒数。
 - `expires`属性的值为 UTC 格式，可以使用`Date.prototype.toUTCString()`进行日期格式转换。
 
@@ -352,9 +352,11 @@ document.cookie = "foo=bar; expires=Fri, 31 Dec 2020 23:59:59 GMT";
 document.cookie = 'fontSize=14; '
   + 'expires=' + someDate.toGMTString() + '; '
   + 'path=/subdirectory; '
-  + 'domain=*.example.com';
+  + 'domain=example.com';
 ```
 
+注意，上面的`domain`属性，以前的写法是`.example.com`，表示子域名也可以读取该 Cookie，新的写法可以省略前面的点。
+
 Cookie 的属性一旦设置完成，就没有办法读取这些属性的值。
 
 删除一个现存 Cookie 的唯一方法，是设置它的`expires`属性为一个过去的日期。
diff --git a/docs/bom/cors.md b/docs/bom/cors.md
index 368ea0c..566e1f0 100644
--- a/docs/bom/cors.md
+++ b/docs/bom/cors.md
@@ -1,12 +1,12 @@
 # CORS 通信
 
-CORS 是一个 W3C 标准，全称是“跨域资源共享”（Cross-origin resource sharing）。它允许浏览器向跨域的服务器，发出`XMLHttpRequest`请求，从而克服了 AJAX 只能同源使用的限制。
+CORS 是一个 W3C 标准，全称是“跨源资源共享”（Cross-origin resource sharing），或者通俗地称为“跨域资源共享”。它允许浏览器向跨源的服务器，发出`XMLHttpRequest`请求，从而克服了 AJAX 只能同源使用的限制。
 
 ## 简介
 
 CORS 需要浏览器和服务器同时支持。目前，所有浏览器都支持该功能。
 
-整个 CORS 通信过程，都是浏览器自动完成，不需要用户参与。对于开发者来说，CORS 通信与普通的 AJAX 通信没有差别，代码完全一样。浏览器一旦发现 AJAX 请求跨域，就会自动添加一些附加的头信息，有时还会多出一次附加的请求，但用户不会有感知。因此，实现 CORS 通信的关键是服务器。只要服务器实现了 CORS 接口，就可以跨域通信。
+整个 CORS 通信过程，都是浏览器自动完成，不需要用户参与。对于开发者来说，CORS 通信与普通的 AJAX 通信没有差别，代码完全一样。浏览器一旦发现 AJAX 请求跨源，就会自动添加一些附加的头信息，有时还会多出一次附加的请求，但用户不会有感知。因此，实现 CORS 通信的关键是服务器。只要服务器实现了 CORS 接口，就可以跨源通信。
 
 ## 两种请求
 
@@ -30,7 +30,7 @@ CORS 请求分成两类：简单请求（simple request）和非简单请求（n
 
 凡是不同时满足上面两个条件，就属于非简单请求。一句话，简单请求就是简单的 HTTP 方法与简单的 HTTP 头信息的结合。
 
-这样划分的原因是，表单在历史上一直可以跨域发出请求。简单请求就是表单请求，浏览器沿袭了传统的处理方式，不把行为复杂化，否则开发者可能转而使用表单，规避 CORS 的限制。对于非简单请求，浏览器会采用新的处理方式。
+这样划分的原因是，表单在历史上一直可以跨源发出请求。简单请求就是表单请求，浏览器沿袭了传统的处理方式，不把行为复杂化，否则开发者可能转而使用表单，规避 CORS 的限制。对于非简单请求，浏览器会采用新的处理方式。
 
 ## 简单请求
 
@@ -38,7 +38,7 @@ CORS 请求分成两类：简单请求（simple request）和非简单请求（n
 
 对于简单请求，浏览器直接发出 CORS 请求。具体来说，就是在头信息之中，增加一个`Origin`字段。
 
-下面是一个例子，浏览器发现这次跨域 AJAX 请求是简单请求，就自动在头信息之中，添加一个`Origin`字段。
+下面是一个例子，浏览器发现这次跨源 AJAX 请求是简单请求，就自动在头信息之中，添加一个`Origin`字段。
 
 ```http
 GET /cors HTTP/1.1
@@ -99,7 +99,7 @@ xhr.withCredentials = true;
 xhr.withCredentials = false;
 ```
 
-需要注意的是，如果服务器要求浏览器发送 Cookie，`Access-Control-Allow-Origin`就不能设为星号，必须指定明确的、与请求网页一致的域名。同时，Cookie 依然遵循同源政策，只有用服务器域名设置的 Cookie 才会上传，其他域名的 Cookie 并不会上传，且（跨域）原网页代码中的`document.cookie`也无法读取服务器域名下的 Cookie。
+需要注意的是，如果服务器要求浏览器发送 Cookie，`Access-Control-Allow-Origin`就不能设为星号，必须指定明确的、与请求网页一致的域名。同时，Cookie 依然遵循同源政策，只有用服务器域名设置的 Cookie 才会上传，其他域名的 Cookie 并不会上传，且（跨源）原网页代码中的`document.cookie`也无法读取服务器域名下的 Cookie。
 
 ## 非简单请求
 
@@ -107,7 +107,7 @@ xhr.withCredentials = false;
 
 非简单请求是那种对服务器提出特殊要求的请求，比如请求方法是`PUT`或`DELETE`，或者`Content-Type`字段的类型是`application/json`。
 
-非简单请求的 CORS 请求，会在正式通信之前，增加一次 HTTP 查询请求，称为“预检”请求（preflight）。浏览器先询问服务器，当前网页所在的域名是否在服务器的许可名单之中，以及可以使用哪些 HTTP 方法和头信息字段。只有得到肯定答复，浏览器才会发出正式的`XMLHttpRequest`请求，否则就报错。这是为了防止这些新增的请求，对传统的没有 CORS 支持的服务器形成压力，给服务器一个提前拒绝的机会，这样可以防止服务器收到大量`DELETE`和`PUT`请求，这些传统的表单不可能跨域发出的请求。
+非简单请求的 CORS 请求，会在正式通信之前，增加一次 HTTP 查询请求，称为“预检”请求（preflight）。浏览器先询问服务器，当前网页所在的域名是否在服务器的许可名单之中，以及可以使用哪些 HTTP 方法和头信息字段。只有得到肯定答复，浏览器才会发出正式的`XMLHttpRequest`请求，否则就报错。这是为了防止这些新增的请求，对传统的没有 CORS 支持的服务器形成压力，给服务器一个提前拒绝的机会，这样可以防止服务器收到大量`DELETE`和`PUT`请求，这些传统的表单不可能跨源发出的请求。
 
 下面是一段浏览器的 JavaScript 脚本。
 
@@ -162,7 +162,6 @@ Content-Encoding: gzip
 Content-Length: 0
 Keep-Alive: timeout=2, max=100
 Connection: Keep-Alive
-Content-Type: text/plain
 ```
 
 上面的 HTTP 回应中，关键的是`Access-Control-Allow-Origin`字段，表示`http://api.bob.com`可以请求数据。该字段也可以设为星号，表示同意任意跨源请求。
@@ -200,7 +199,7 @@ Access-Control-Max-Age: 1728000
 
 **（1）`Access-Control-Allow-Methods`**
 
-该字段必需，它的值是逗号分隔的一个字符串，表明服务器支持的所有跨域请求的方法。注意，返回的是所有支持的方法，而不单是浏览器请求的那个方法。这是为了避免多次“预检”请求。
+该字段必需，它的值是逗号分隔的一个字符串，表明服务器支持的所有跨源请求的方法。注意，返回的是所有支持的方法，而不单是浏览器请求的那个方法。这是为了避免多次“预检”请求。
 
 **（2）`Access-Control-Allow-Headers`**
 
diff --git a/docs/bom/engine.md b/docs/bom/engine.md
index 86e7f53..8c0761e 100644
--- a/docs/bom/engine.md
+++ b/docs/bom/engine.md
@@ -436,4 +436,4 @@ JavaScript 是一种解释型语言，也就是说，它不需要编译，由解
 - Axel Rauschmayer, [ECMAScript 6 promises (1/2): foundations](http://www.2ality.com/2014/09/es6-promises-foundations.html)
 - Daniel Imms, [async vs defer attributes](http://www.growingwiththeweb.com/2014/02/async-vs-defer-attributes.html)
 - Craig Buckler, [Load Non-blocking JavaScript with HTML5 Async and Defer](http://www.sitepoint.com/non-blocking-async-defer/)
-- Domenico De Felice, [How browsers work](http://domenicodefelice.blogspot.sg/2015/08/how-browsers-work.html?t=2)
+- Domenico De Felice, [How browsers work](https://domenicodefelice.blogspot.com/2015/08/how-browsers-work.html)
diff --git a/docs/bom/same-origin.md b/docs/bom/same-origin.md
index 50577ce..4a11a0b 100644
--- a/docs/bom/same-origin.md
+++ b/docs/bom/same-origin.md
@@ -194,7 +194,7 @@ window.addEventListener('message', function (e) {
 `message`事件的参数是事件对象`event`，提供以下三个属性。
 
 > - `event.source`：发送消息的窗口
-> - `event.origin`: 消息发向的网址
+> - `event.origin`: 消息发送者的源（origin），即协议、域名、端口。
 > - `event.data`: 消息内容
 
 下面的例子是，子窗口通过`event.source`属性引用父窗口，然后发送消息。
@@ -208,7 +208,7 @@ function receiveMessage(event) {
 
 上面代码有几个地方需要注意。首先，`receiveMessage`函数里面没有过滤信息的来源，任意网址发来的信息都会被处理。其次，`postMessage`方法中指定的目标窗口的网址是一个星号，表示该信息可以向任意网址发送。通常来说，这两种做法是不推荐的，因为不够安全，可能会被恶意利用。
 
-`event.origin`属性可以过滤不是发给本窗口的消息。
+`event.origin`属性可以过滤非许可地址发来的消息。
 
 ```javascript
 window.addEventListener('message', receiveMessage);
diff --git a/docs/bom/window.md b/docs/bom/window.md
index a012d61..a873fae 100644
--- a/docs/bom/window.md
+++ b/docs/bom/window.md
@@ -579,7 +579,7 @@ var start = null;
 function step(timestamp) {
   if (!start) start = timestamp;
   var progress = timestamp - start;
-  // 元素不断向左移，最大不超过200像素
+  // 元素不断向右移，最大不超过200像素
   element.style.left = Math.min(progress / 10, 200) + 'px';
   // 如果距离第一次执行不超过 2000 毫秒，
   // 就继续执行动画
diff --git a/docs/bom/xmlhttprequest.md b/docs/bom/xmlhttprequest.md
index 8855064..66f662c 100644
--- a/docs/bom/xmlhttprequest.md
+++ b/docs/bom/xmlhttprequest.md
@@ -743,7 +743,7 @@ window.addEventListener('unload', function(event) {
 
 上面代码中，强制执行了一次双重循环，拖长了`unload`事件的执行时间，导致异步 AJAX 能够发送成功。
 
-类似的还可以使用`setTimeout`。下面是追踪用户点击的例子。
+类似的还可以使用`setTimeout()`。下面是追踪用户点击的例子。
 
 ```javascript
 // HTML 代码如下
@@ -768,7 +768,7 @@ theLink.addEventListener('click', function (event) {
 });
 ```
 
-上面代码使用`setTimeout`，拖延了350毫秒，才让页面跳转，因此使得异步 AJAX 有时间发出。
+上面代码使用`setTimeout()`，拖延了350毫秒，才让页面跳转，因此使得异步 AJAX 有时间发出。
 
 这些做法的共同问题是，卸载的时间被硬生生拖长了，后面页面的加载被推迟了，用户体验不好。
 
@@ -778,11 +778,13 @@ theLink.addEventListener('click', function (event) {
 window.addEventListener('unload', logData, false);
 
 function logData() {
-  navigator.sendBeacon('/log', analyticsData);
+  navigator.sendBeacon('/log', JSON.stringify({
+    some: "data"
+  }));
 }
 ```
 
-`Navigator.sendBeacon`方法接受两个参数，第一个参数是目标服务器的 URL，第二个参数是所要发送的数据（可选），可以是任意类型（字符串、表单对象、二进制对象等等）。
+`Navigator.sendBeacon()`方法接受两个参数，第一个参数是目标服务器的 URL，第二个参数是所要发送的数据（可选），可以是任意类型（字符串、表单对象、二进制对象等等）。
 
 ```javascript
 navigator.sendBeacon(url, data)
@@ -806,3 +808,16 @@ function analytics(state) {
   navigator.sendBeacon(URL, data);
 }
 ```
+
+该方法不允许自定义 HTTP 标头，为了以“application/json”的形式发送数据，可以使用 Blob 对象。
+
+```javascript
+const blob = new Blob(
+  [ JSON.stringify({ some: "data" }) ],
+  { type: 'application/json; charset=UTF-8' }
+);
+navigator.sendBeacon('/log', blob));
+```
+
+这个方法的优先级较低，不会占用页面资源。一般是在浏览器空闲的时候，才会发送。
+
diff --git a/docs/dom/css.md b/docs/dom/css.md
index 5a1d39a..b4f1a2d 100644
--- a/docs/dom/css.md
+++ b/docs/dom/css.md
@@ -292,7 +292,7 @@ CSS.supports('display: table-cell;') // false
 
 行内样式（inline style）具有最高的优先级，改变行内样式，通常会立即反映出来。但是，网页元素最终的样式是综合各种规则计算出来的。因此，如果想得到元素实际的样式，只读取行内样式是不够的，需要得到浏览器最终计算出来的样式规则。
 
-`window.getComputedStyle`方法，就用来返回浏览器计算后得到的最终规则。它接受一个节点对象作为参数，返回一个 CSSStyleDeclaration  实例，包含了指定节点的最终样式信息。所谓“最终样式信息”，指的是各种 CSS 规则叠加后的结果。
+`window.getComputedStyle()`方法，就用来返回浏览器计算后得到的最终规则。它接受一个节点对象作为参数，返回一个 CSSStyleDeclaration 实例，包含了指定节点的最终样式信息。所谓“最终样式信息”，指的是各种 CSS 规则叠加后的结果。
 
 ```javascript
 var div = document.querySelector('div');
@@ -328,7 +328,7 @@ var height = styleObj.getPropertyValue('height');
 - CSSStyleDeclaration 实例返回的 CSS 值都是绝对单位。比如，长度都是像素单位（返回值包括`px`后缀），颜色是`rgb(#, #, #)`或`rgba(#, #, #, #)`格式。
 - CSS 规则的简写形式无效。比如，想读取`margin`属性的值，不能直接读，只能读`marginLeft`、`marginTop`等属性；再比如，`font`属性也是不能直接读的，只能读`font-size`等单个属性。
 - 如果读取 CSS 原始的属性名，要用方括号运算符，比如`styleObj['z-index']`；如果读取骆驼拼写法的 CSS 属性名，可以直接读取`styleObj.zIndex`。
-- 该方法返回的 CSSStyleDeclaration 实例的`cssText`属性无效，返回`undefined`。
+- 该方法返回的 CSSStyleDeclaration 实例的`cssText`属性总是返回空字符串。
 
 ## CSS 伪元素
 
@@ -401,9 +401,9 @@ myStyleSheet instanceof StyleSheet // true
 
 注意，`disabled`属性只能在 JavaScript 脚本中设置，不能在 HTML 语句中设置。
 
-**（2）Stylesheet.href**
+**（2）StyleSheet.href**
 
-`Stylesheet.href`返回样式表的网址。对于内嵌样式表，该属性返回`null`。该属性只读。
+`StyleSheet.href`返回样式表的网址。对于内嵌样式表，该属性返回`null`。该属性只读。
 
 ```javascript
 document.styleSheets[0].href
diff --git a/docs/dom/document.md b/docs/dom/document.md
index 3eb1d02..7af7f3a 100644
--- a/docs/dom/document.md
+++ b/docs/dom/document.md
@@ -69,7 +69,10 @@ document.scrollingElement.scrollTop = 0;
 `document.fullscreenElement`属性返回当前以全屏状态展示的 DOM 元素。如果不是全屏状态，该属性返回`null`。
 
 ```javascript
-if (document.fullscreenElement.nodeName == 'VIDEO') {
+if (
+  document.fullscreenElement && 
+  document.fullscreenElement.nodeName == 'VIDEO'
+) {
   console.log('全屏播放视频');
 }
 ```
@@ -363,7 +366,7 @@ document.replaceChild(
 );
 ```
 
-上面代码中，第一步生成一个新的 HTML 文档`doc`，然后用它的根元素`document.documentElement`替换掉`document.documentElement`。这会使得当前文档的内容全部消失，变成`hello world`。
+上面代码中，第一步生成一个新的 HTML 文档`doc`，然后用它的根元素`doc.documentElement`替换掉`document.documentElement`。这会使得当前文档的内容全部消失，变成`hello world`。
 
 ## 方法
 
@@ -716,7 +719,7 @@ var element  = document.getElementById('ul');
 element.appendChild(docfrag);
 ```
 
-上面代码中，文档片断`docfrag`包含四个`<li>`节点，这些子节点被一次性插入了当前文档。
+上面代码中，文档片段`docfrag`包含四个`<li>`节点，这些子节点被一次性插入了当前文档。
 
 ### document.createEvent()
 
diff --git a/docs/dom/element.md b/docs/dom/element.md
index 2b5ea6d..6a73887 100644
--- a/docs/dom/element.md
+++ b/docs/dom/element.md
@@ -371,8 +371,8 @@ document.body.scrollHeight
 
 ```javascript
 // HTML 代码如下
-// <div id="myDiv" style="height: 200px; overflow: hidden;">...<div>
-document.getElementById('myDiv').scrollHeight // 356
+// <div id="myDiv" style="height: 200px; overflow: hidden;">...</div>
+document.getElementById('myDiv').scrollHeight // 200
 ```
 
 上面代码中，即使`myDiv`元素的 CSS 高度只有200像素，且溢出部分不可见，但是`scrollHeight`仍然会返回该元素的原始高度。
diff --git a/docs/dom/mutationobserver.md b/docs/dom/mutationobserver.md
index ace5853..0715565 100644
--- a/docs/dom/mutationobserver.md
+++ b/docs/dom/mutationobserver.md
@@ -44,7 +44,7 @@ var observer = new MutationObserver(function (mutations, observer) {
 ```javascript
 var article = document.querySelector('article');
 
-var  options = {
+var options = {
   'childList': true,
   'attributes':true
 } ;
diff --git a/docs/elements/input.md b/docs/elements/input.md
index 9a04e0e..fce544a 100644
--- a/docs/elements/input.md
+++ b/docs/elements/input.md
@@ -75,7 +75,18 @@
 - `labels`：返回一个`NodeList`实例，代表绑定当前`<input>`节点的`<label>`元素。该属性只读。
 - `step`：字符串，表示在`min`属性到`max`属性之间，每次递增或递减时的数值或时间。
 - `valueAsDate`：`Date`实例，一旦设置，该`<input>`元素的值会被解释为指定的日期。如果无法解析该属性的值，`<input>`节点的值将是`null`。
-- `valueAsNumber`：浮点数，当前`<input>`元素的值会被解析为这个数值。
+- `valueAsNumber`：浮点数，当前`<input>`元素的值会被解析为这个数值。如果输入框为空，该属性返回`NaN`。
+
+下面是`valueAsNumber`属性的例子。
+
+```javascript
+/* HTML 代码如下
+   <input type="number" value="1.234" />
+*/
+
+input.value // "1.234"
+input.valueAsNumber // 1.234
+```
 
 ## HTMLInputElement 的实例方法
 
diff --git a/docs/features/style.md b/docs/features/style.md
index 8947aca..0ea77e1 100644
--- a/docs/features/style.md
+++ b/docs/features/style.md
@@ -486,7 +486,7 @@ function doAction(action) {
 
 ## 参考链接
 
-- Eric Elliott, Programming JavaScript Applications, [Chapter 2. JavaScript Style Guide](http://chimera.labs.oreilly.com/books/1234000000262/ch02.html), O'Reilly, 2013
+- Eric Elliott, Programming JavaScript Applications, [Chapter 2. JavaScript Style Guide](https://www.oreilly.com/library/view/programming-javascript-applications/9781491950289/), O'Reilly, 2014
 - Axel Rauschmayer, [A meta style guide for JavaScript](http://www.2ality.com/2013/07/meta-style-guide.html)
 - Axel Rauschmayer, [Automatic semicolon insertion in JavaScript](http://www.2ality.com/2011/05/semicolon-insertion.html)
 - Rod Vagg, [JavaScript and Semicolons](http://dailyjs.com/2012/04/19/semicolons/)
diff --git a/docs/oop/prototype.md b/docs/oop/prototype.md
index 76077e2..d1ae8df 100644
--- a/docs/oop/prototype.md
+++ b/docs/oop/prototype.md
@@ -637,4 +637,4 @@ var module1 = (function ($, YAHOO) {
 
 ## 参考链接
 
-- [JavaScript Modules: A Beginner’s Guide](https://medium.freecodecamp.com/javascript-modules-a-beginner-s-guide-783f7d7a5fcc), by Preethi Kasireddy
+- [JavaScript Modules: A Beginner’s Guide](https://www.freecodecamp.org/news/javascript-modules-a-beginner-s-guide-783f7d7a5fcc), by Preethi Kasireddy
diff --git a/docs/oop/strict.md b/docs/oop/strict.md
index 3dffbe6..cc339c8 100644
--- a/docs/oop/strict.md
+++ b/docs/oop/strict.md
@@ -12,7 +12,7 @@
 
 - 明确禁止一些不合理、不严谨的语法，减少 JavaScript 语言的一些怪异行为。
 - 增加更多报错的场合，消除代码运行的一些不安全之处，保证代码运行的安全。
-- 提高编译器效率，增加运行速度。
+- 提高编译器效率，提升运行速度。
 - 为未来新版本的 JavaScript 语法做好铺垫。
 
 总之，严格模式体现了 JavaScript 更合理、更安全、更严谨的发展方向。
@@ -108,7 +108,7 @@ function notStrict() {
 ```javascript
 // 对只读属性赋值会报错
 'use strict';
-Object.defineProperty({}, 'a', {
+var obj = Object.defineProperty({}, 'a', {
   value: 37,
   writable: false
 });
diff --git a/docs/oop/this.md b/docs/oop/this.md
index 6668047..6792c30 100644
--- a/docs/oop/this.md
+++ b/docs/oop/this.md
@@ -679,19 +679,19 @@ Array.prototype.slice.apply({length: 1}) // [undefined]
 前面的按钮点击事件的例子，可以改写如下。
 
 ```javascript
-var o = new Object();
+var obj = new Object();
 
-o.f = function () {
-  console.log(this === o);
+var func = function () {
+  console.log(this === obj);
 }
 
-var f = function (){
-  o.f.apply(o);
-  // 或者 o.f.call(o);
+var handler = function (){
+  func.apply(obj);
+  // 或者 func.call(obj);
 };
 
 // jQuery 的写法
-$('#button').on('click', f);
+$('#button').on('click', handler);
 ```
 
 上面代码中，点击按钮以后，控制台将会显示`true`。由于`apply()`方法（或者`call()`方法）不仅绑定函数执行时所在的对象，还会立即执行函数，因此不得不把绑定语句写在一个函数体内。更简洁的写法是采用下面介绍的`bind()`方法。
diff --git a/docs/operators/bit.md b/docs/operators/bit.md
index edbb8b4..3c86e3d 100644
--- a/docs/operators/bit.md
+++ b/docs/operators/bit.md
@@ -353,6 +353,6 @@ flags = ~flags;
 
 ## 参考链接
 
-- Michal Budzynski, [JavaScript: The less known parts. Bitwise Operators](http://michalbe.blogspot.co.uk/2013/03/javascript-less-known-parts-bitwise.html)
+- Michal Budzynski, [JavaScript: The less known parts. Bitwise Operators](https://michalbe.blogspot.com/2013/03/javascript-less-known-parts-bitwise.html)
 - Axel Rauschmayer, [Basic JavaScript for the impatient programmer](http://www.2ality.com/2013/06/basic-javascript.html)
 - Mozilla Developer Network, [Bitwise Operators](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators)
diff --git a/docs/operators/comparison.md b/docs/operators/comparison.md
index 3f34eca..002254a 100644
--- a/docs/operators/comparison.md
+++ b/docs/operators/comparison.md
@@ -99,7 +99,7 @@ x > '11' // true
 
 x.valueOf = function () { return '1' };
 x > '11' // false
-// 等同于 [2].valueOf() > '11'
+// 等同于 (function () { return '1' })() > '11'
 // 即 '1' > '11'
 ```
 
@@ -114,8 +114,8 @@ x > '11' // false
 // 等同于 [2].valueOf().toString() > [11].valueOf().toString()
 // 即 '2' > '11'
 
-{ x: 2 } >= { x: 1 } // true
-// 等同于 { x: 2 }.valueOf().toString() >= { x: 1 }.valueOf().toString()
+({ x: 2 }) >= ({ x: 1 }) // true
+// 等同于 ({ x: 2 }).valueOf().toString() >= ({ x: 1 }).valueOf().toString()
 // 即 '[object Object]' >= '[object Object]'
 ```
 
diff --git a/docs/stdlib/date.md b/docs/stdlib/date.md
index 4edbaeb..d0475da 100644
--- a/docs/stdlib/date.md
+++ b/docs/stdlib/date.md
@@ -317,15 +317,15 @@ d.toTimeString() // "00:00:00 GMT+0800 (CST)"
 var d = new Date(2013, 0, 1);
 
 d.toLocaleString()
-// 中文版浏览器为"2013年1月1日 上午12:00:00"
+// 中文版浏览器为"2013/1/1 00:00:00"
 // 英文版浏览器为"1/1/2013 12:00:00 AM"
 
 d.toLocaleDateString()
-// 中文版浏览器为"2013年1月1日"
+// 中文版浏览器为"2013/1/1"
 // 英文版浏览器为"1/1/2013"
 
 d.toLocaleTimeString()
-// 中文版浏览器为"上午12:00:00"
+// 中文版浏览器为"00:00:00"
 // 英文版浏览器为"12:00:00 AM"
 ```
 
@@ -343,13 +343,13 @@ dateObj.toLocaleTimeString([locales[, options]])
 var d = new Date(2013, 0, 1);
 
 d.toLocaleString('en-US') // "1/1/2013, 12:00:00 AM"
-d.toLocaleString('zh-CN') // "2013/1/1 上午12:00:00"
+d.toLocaleString('zh-CN') // "2013/1/1 00:00:00"
 
 d.toLocaleDateString('en-US') // "1/1/2013"
 d.toLocaleDateString('zh-CN') // "2013/1/1"
 
 d.toLocaleTimeString('en-US') // "12:00:00 AM"
-d.toLocaleTimeString('zh-CN') // "上午12:00:00"
+d.toLocaleTimeString('zh-CN') // "00:00:00"
 ```
 
 `options`配置对象有以下属性。
@@ -361,7 +361,7 @@ d.toLocaleTimeString('zh-CN') // "上午12:00:00"
 - `weekday`：可能的值为`long`、`short`、`narrow`。
 - `day`、`hour`、`minute`、`second`：可能的值为`numeric`、`2-digit`。
 - `timeZone`：可能的值为 IANA 的时区数据库。
-- `timeZooneName`：可能的值为`long`、`short`。
+- `timeZoneName`：可能的值为`long`、`short`。
 - `hour12`：24小时周期还是12小时周期，可能的值为`true`、`false`。
 
 下面是用法实例。
@@ -479,7 +479,7 @@ d.getUTCDate() // 5
 - `setDate(date)`：设置实例对象对应的每个月的几号（1-31），返回改变后毫秒时间戳。
 - `setFullYear(year [, month, date])`：设置四位年份。
 - `setHours(hour [, min, sec, ms])`：设置小时（0-23）。
-- `setMilliseconds()`：设置毫秒（0-999）。
+- `setMilliseconds(ms)`：设置毫秒（0-999）。
 - `setMinutes(min [, sec, ms])`：设置分钟（0-59）。
 - `setMonth(month [, date])`：设置月份（0-11）。
 - `setSeconds(sec [, ms])`：设置秒（0-59）。
@@ -545,5 +545,5 @@ d // Sun Jan 06 2013 06:00:00 GMT+0800 (CST)
 
 ## 参考链接
 
-- Rakhitha Nimesh，[Getting Started with the Date Object](http://jspro.com/raw-javascript/beginners-guide-to-javascript-date-and-time/)
-- Ilya Kantor, [Date/Time functions](http://javascript.info/tutorial/datetime-functions)
+- Rakhitha Nimesh，[Getting Started with the Date Object](https://www.sitepoint.com/beginners-guide-to-javascript-date-and-time/)
+- Ilya Kantor, [Date/Time functions](https://javascript.info/date)
diff --git a/docs/stdlib/json.md b/docs/stdlib/json.md
index dfe1b76..c395d46 100644
--- a/docs/stdlib/json.md
+++ b/docs/stdlib/json.md
@@ -395,6 +395,15 @@ JSON.parse('{"a": 1, "b": 2}', f)
 
 上面代码中，`JSON.parse()`的第二个参数是一个函数，如果键名是`a`，该函数会将键值加上10。
 
+`JSON.parse()`和`JSON.stringify()`可以结合使用，像下面这样写，实现对象的深拷贝。
+
+```javascript
+JSON.parse(JSON.stringify(obj))
+```
+
+上面这种写法，可以深度克隆一个对象，但是对象内部不能有 JSON
+不允许的数据类型，比如函数、正则对象、日期对象等。
+
 ## 参考链接
 
 - MDN, [Using native JSON](https://developer.mozilla.org/en-US/docs/Using_native_JSON)
diff --git a/docs/stdlib/object.md b/docs/stdlib/object.md
index 51ba1e6..24b44ca 100644
--- a/docs/stdlib/object.md
+++ b/docs/stdlib/object.md
@@ -308,7 +308,7 @@ var obj = {};
 obj.toString() // "[object Object]"
 ```
 
-上面代码调用空对象的`toString`方法，结果返回一个字符串`object Object`，其中第二个`Object`表示该值的构造函数。这是一个十分有用的判断数据类型的方法。
+上面代码调用空对象的`toString`方法，结果返回一个字符串`[object Object]`，其中第二个`Object`表示该值的构造函数。这是一个十分有用的判断数据类型的方法。
 
 由于实例对象可能会自定义`toString`方法，覆盖掉`Object.prototype.toString`方法，所以为了得到类型字符串，最好直接使用`Object.prototype.toString`方法。通过函数的`call`方法，可以在任意值上调用这个方法，帮助我们判断这个值的类型。
 
diff --git a/docs/stdlib/regexp.md b/docs/stdlib/regexp.md
index 8e306e0..5a1d884 100644
--- a/docs/stdlib/regexp.md
+++ b/docs/stdlib/regexp.md
@@ -104,7 +104,7 @@ r.lastIndex = 4;
 r.test(s) // false
 
 r.lastIndex // 0
-r.test(s)
+r.test(s) // true
 ```
 
 上面代码指定从字符串的第五个位置开始搜索，这个位置为空，所以返回`false`。同时，`lastIndex`属性重置为`0`，所以第二次执行`r.test(s)`会返回`true`。
@@ -150,7 +150,7 @@ r2.exec(s) // null
 
 上面代码中，正则对象`r1`匹配成功，返回一个数组，成员是匹配结果；正则对象`r2`匹配失败，返回`null`。
 
-如果正则表示式包含圆括号（即含有“组匹配”），则返回的数组会包括多个成员。第一个成员是整个匹配成功的结果，后面的成员就是圆括号对应的匹配成功的组。也就是说，第二个成员对应第一个括号，第三个成员对应第二个括号，以此类推。整个数组的`length`属性等于组匹配的数量再加1。
+如果正则表达式包含圆括号（即含有“组匹配”），则返回的数组会包括多个成员。第一个成员是整个匹配成功的结果，后面的成员就是圆括号对应的匹配成功的组。也就是说，第二个成员对应第一个括号，第三个成员对应第二个括号，以此类推。整个数组的`length`属性等于组匹配的数量再加1。
 
 ```javascript
 var s = '_x_x';
diff --git a/docs/types/function.md b/docs/types/function.md
index d8e649e..751bca5 100644
--- a/docs/types/function.md
+++ b/docs/types/function.md
@@ -1,6 +1,6 @@
 # 函数
 
-函数是一段可以反复调用的代码块。函数还能接受输入的参数，不同的参数会返回不同的值。
+函数是一段可以反复调用的代码块。函数还能接受输入的参数，不同的参数有唯一对应的返回值。
 
 ## 概述
 
@@ -992,8 +992,8 @@ window.eval('...')
 ## 参考链接
 
 - Ben Alman, [Immediately-Invoked Function Expression (IIFE)](http://benalman.com/news/2010/11/immediately-invoked-function-expression/)
-- Mark Daggett, [Functions Explained](http://markdaggett.com/blog/2013/02/15/functions-explained/)
-- Juriy Zaytsev, [Named function expressions demystified](http://kangax.github.com/nfe/)
+- Mark Daggett, [Functions Explained](https://web.archive.org/web/20160911170816/http://markdaggett.com/blog/2013/02/15/functions-explained/)
+- Juriy Zaytsev, [Named function expressions demystified](http://kangax.github.io/nfe/)
 - Marco Rogers polotek, [What is the arguments object?](http://docs.nodejitsu.com/articles/javascript-conventions/what-is-the-arguments-object)
 - Juriy Zaytsev, [Global eval. What are the options?](http://perfectionkills.com/global-eval-what-are-the-options/)
 - Axel Rauschmayer, [Evaluating JavaScript code via eval() and new Function()](http://www.2ality.com/2014/01/eval.html)
diff --git a/docs/types/general.md b/docs/types/general.md
index 8454b44..6d512ef 100644
--- a/docs/types/general.md
+++ b/docs/types/general.md
@@ -2,7 +2,7 @@
 
 ## 简介
 
-JavaScript 语言的每一个值，都属于某一种数据类型。JavaScript 的数据类型，共有六种。（ES6 又新增了第七种 Symbol 类型的值，本教程不涉及。）
+JavaScript 语言的每一个值，都属于某一种数据类型。JavaScript 的数据类型，共有六种。（ES6 又新增了 Symbol 和 BigInt 数据类型，本教程不涉及。）
 
 - 数值（number）：整数和小数（比如`1`和`3.14`）。
 - 字符串（string）：文本（比如`Hello World`）。
diff --git a/docs/types/null-undefined-boolean.md b/docs/types/null-undefined-boolean.md
index 9a76679..129dda3 100644
--- a/docs/types/null-undefined-boolean.md
+++ b/docs/types/null-undefined-boolean.md
@@ -35,7 +35,7 @@ undefined == null
 
 既然含义与用法都差不多，为什么要同时设置两个这样的值，这不是无端增加复杂度，令初学者困扰吗？这与历史原因有关。
 
-1995年 JavaScript 诞生时，最初像 Java 一样，只设置了`null`表示"无"。根据 C 语言的传统，`null`可以自动转为`0`。
+1995年 JavaScript 诞生时，最初像 Java 一样，只设置了`null`表示“无”。根据 C 语言的传统，`null`可以自动转为`0`。
 
 ```javascript
 Number(null) // 0
@@ -46,7 +46,7 @@ Number(null) // 0
 
 但是，JavaScript 的设计者 Brendan Eich，觉得这样做还不够。首先，第一版的 JavaScript 里面，`null`就像在 Java 里一样，被当成一个对象，Brendan Eich 觉得表示“无”的值最好不是对象。其次，那时的 JavaScript 不包括错误处理机制，Brendan Eich 觉得，如果`null`自动转为0，很不容易发现错误。
 
-因此，他又设计了一个`undefined`。区别是这样的：`null`是一个表示“空”的对象，转为数值时为`0`；`undefined`是一个表示"此处无定义"的原始值，转为数值时为`NaN`。
+因此，他又设计了一个`undefined`。区别是这样的：`null`是一个表示“空”的对象，转为数值时为`0`；`undefined`是一个表示“此处无定义”的原始值，转为数值时为`NaN`。
 
 ```javascript
 Number(undefined) // NaN
diff --git a/docs/types/number.md b/docs/types/number.md
index af8954e..53ebfb5 100644
--- a/docs/types/number.md
+++ b/docs/types/number.md
@@ -43,7 +43,7 @@ JavaScript 内部，所有数字都是以64位浮点数形式储存，即使整
 
 上面公式是正常情况下（指数部分在0到2047之间），一个数在 JavaScript 内部实际的表示形式。
 
-精度最多只能到53个二进制位，这意味着，绝对值小于2的53次方的整数，即-2<sup>53</sup>到2<sup>53</sup>，都可以精确表示。
+精度最多只能到53个二进制位，这意味着，绝对值小于2的53次方的整数，即-2<sup>53</sup> + 1 到 2<sup>53</sup> - 1，都可以精确表示。
 
 ```javascript
 Math.pow(2, 53)
@@ -280,6 +280,12 @@ NaN * 32 // NaN
 NaN / 32 // NaN
 ```
 
+但是，ES6 引入指数运算符（`**`）后，出现了一个例外。
+
+```javascript
+NaN ** 0 // 1
+```
+
 ### Infinity
 
 **（1）含义**
@@ -552,7 +558,15 @@ parseFloat('3.14more non-digit characters') // 3.14
 parseFloat('\t\v\r12.34\n ') // 12.34
 ```
 
-如果参数不是字符串，或者字符串的第一个字符不能转化为浮点数，则返回`NaN`。
+如果参数不是字符串，则会先转为字符串再转换。
+
+```javascript
+parseFloat([1.23]) // 1.23
+// 等同于
+parseFloat(String([1.23])) // 1.23
+```
+
+如果字符串的第一个字符不能转化为浮点数，则返回`NaN`。
 
 ```javascript
 parseFloat([]) // NaN
@@ -651,4 +665,4 @@ isFinite(-1) // true
 ## 参考链接
 
 - Dr. Axel Rauschmayer, [How numbers are encoded in JavaScript](http://www.2ality.com/2012/04/number-encoding.html)
-- Humphry, [JavaScript 中 Number 的一些表示上/下限](http://blog.segmentfault.com/humphry/1190000000407658)
+- Humphry, [JavaScript 中 Number 的一些表示上/下限](https://segmentfault.com/a/1190000000407658)
diff --git a/docs/types/object.md b/docs/types/object.md
index 9e50984..3ff539c 100644
--- a/docs/types/object.md
+++ b/docs/types/object.md
@@ -497,5 +497,5 @@ console.log(temp.p1 + temp.p2);
 
 - Dr. Axel Rauschmayer，[Object properties in JavaScript](http://www.2ality.com/2012/10/javascript-properties.html)
 - Lakshan Perera, [Revisiting JavaScript Objects](http://www.laktek.com/2012/12/29/revisiting-javascript-objects/)
-- Angus Croll, [The Secret Life of JavaScript Primitives](http://javascriptweblog.wordpress.com/2010/09/27/the-secret-life-of-javascript-primitives/)i
+- Angus Croll, [The Secret Life of JavaScript Primitives](http://javascriptweblog.wordpress.com/2010/09/27/the-secret-life-of-javascript-primitives/)
 - Dr. Axel Rauschmayer, [JavaScript’s with statement and why it’s deprecated](http://www.2ality.com/2011/06/with-statement.html)
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index 8a03e78..0000000
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+++ /dev/null
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-        "yargs-parser": "^20.2.2"
-      }
-    },
-    "yargs-parser": {
-      "version": "20.2.9",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.9.tgz",
-      "integrity": "sha512-y11nGElTIV+CT3Zv9t7VKl+Q3hTQoT9a1Qzezhhl6Rp21gJ/IVTW7Z3y9EWXhuUBC2Shnf+DX0antecpAwSP8w=="
-    },
-    "yocto-queue": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
-      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q=="
-    }
-  }
-}
diff --git a/package.json b/package.json
index b67124a..479b7bb 100644
--- a/package.json
+++ b/package.json
@@ -14,11 +14,6 @@
     "server": "loppo server",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
-  "husky": {
-    "hooks": {
-      "pre-push": "npm update"
-    }
-  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/wangdoc/javascript-tutorial.git"
@@ -35,9 +30,8 @@
   },
   "homepage": "https://github.com/wangdoc/javascript-tutorial",
   "dependencies": {
-    "gh-pages": "^3.2.3",
-    "husky": "^4.3.8",
+    "gh-pages": "6.x",
     "loppo": "^0.6.24",
-    "loppo-theme-wangdoc": "^0.6.1"
+    "loppo-theme-wangdoc": "^0.7.3"
   }
 }