diff --git a/assets/chrome.png b/assets/chrome.png
new file mode 100644
index 0000000000000000000000000000000000000000..3979d9f9b451bb35ddb5cecb5564773090f240b4
Binary files /dev/null and b/assets/chrome.png differ
diff --git a/assets/edge.png b/assets/edge.png
new file mode 100644
index 0000000000000000000000000000000000000000..a99ee342474fbabb6b9b72a9c3be0908720aa494
Binary files /dev/null and b/assets/edge.png differ
diff --git a/assets/firefox.png b/assets/firefox.png
new file mode 100644
index 0000000000000000000000000000000000000000..a24fa33ec0c3348a3fd5baf4f1037e434fdd9ca0
Binary files /dev/null and b/assets/firefox.png differ
diff --git a/assets/safari.png b/assets/safari.png
new file mode 100644
index 0000000000000000000000000000000000000000..36043daa9a8c48b95b0c6ddbe99810f83d5b3116
Binary files /dev/null and b/assets/safari.png differ
diff --git a/example.html b/example.html
index 20c6719a646b5d9a87a9c078487e7751a4ef37b3..af2a33694aa5a391c3a5ec8c0abc31cd05186f4e 100644
--- a/example.html
+++ b/example.html
@@ -66,8 +66,8 @@
 
   .table {
     border-collapse: collapse;
-    overflow: visible!important;
-    margin: 0!important;
+    overflow: visible !important;
+    margin: 0 !important;
   }
 
   .table td {
@@ -77,7 +77,7 @@
     text-align: center;
     color: #aaa;
     font-size: 14px;
-    padding: 0!important;
+    padding: 0 !important;
   }
 </style>
 
@@ -87,7 +87,7 @@
   <textarea id="markdown" style=" display: none; ">
 <h1 style="text-align: center;">x-scrollbar</h1>
 
-版本: v2.2.1  
+版本: v2.3.0  
 作者: 清晨的阳光(QQ:765550360)  
 许可: MIT  
 源码: https://gitee.com/null_720_0252/x-scrollbar
@@ -100,6 +100,12 @@
 * 滚动条可以半透明的悬浮于内容上方(类似于移动端).
 * 可以设置仅水平滚动(拨动鼠标滚轮将作用于X轴).
 
+### 支持环境
+| ![](./assets/edge.png) | ![](./assets/chrome.png) | ![](./assets/firefox.png) | ![](./assets/safari.png) |
+| ---- | ---- | ---- | ---- |
+| IE9~11 / Edge | Chrome | Firefox | Safari |
+> IE浏览器不支持笔记本触控板的双指滚动, 需要外接鼠标
+
 ## 安装
 
 ### 直接在浏览器中使用
@@ -110,6 +116,14 @@
 <script src="./xscrollbar.js"></script>
 ```
 
+CDN
+```html
+<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/x-scrollbar/xscrollbar.css">
+```
+```html
+<script src="https://cdn.jsdelivr.net/npm/x-scrollbar/xscrollbar.js"></script>
+```
+
 ### 通过npm安装
 ```bash
 npm i x-scrollbar --save
@@ -144,7 +158,7 @@ $container.scrollLeft = 100
 $container.scrollTop = 100
 
 // 监听滚动
-$container.addEventListener('scroll', (e) => {
+$container.addEventListener('scroll', function()  {
     //...
 })
 ```
@@ -166,7 +180,7 @@ new XScrollbar(dom: HTMLElement, options?: object)
 | --------------- | ------ | ---------------------------------------------------------------------- |
 | autoHide        | true   | 是否自动隐藏滚动条                                                     |
 | disabledScrollY | false  | 是否仅水平滚动(拨动鼠标滚轮将作用于X轴)                                |
-| autoUpdate      | true   | 响应容器和内容大小改变(自动更新滚动条), 否则需要手动调用 update() 方法 |
+| autoUpdate      | true   | 响应容器和内容大小改变(自动更新滚动条), 否则需要手动调用 ` update() ` 方法 |
 | preventDefault  | true   | 是否阻止向上传递滚动事件                                               |
 | smooth          | true   | 平滑滚动(仅作用于鼠标滚轮, 非触控板)                                   |
 
@@ -322,11 +336,11 @@ new XScrollbar(dom: HTMLElement, options?: object)
     let md = document.querySelector('#markdown').value;
     $page_conatiner.innerHTML = marked(md, {
       highlight: function (code, language) {
+        if (typeof hljs == 'undefined') return;
         language = hljs.getLanguage(language) ? language : 'plaintext';
-        return hljs.highlight(code, { language }).value;
+        return hljs.highlight(code, { language: language }).value;
       }
     });
-
     document.querySelector('#base').appendChild(document.querySelector('#base_content'));
     document.querySelector('#style').appendChild(document.querySelector('#style_content'));
 
@@ -336,20 +350,20 @@ new XScrollbar(dom: HTMLElement, options?: object)
 
     // 初始化示例表格内容
     let tbody_list = document.querySelectorAll('.example_table > tbody');
-    Array.from(tbody_list).forEach(tbody => {
+    Array.prototype.forEach.call(tbody_list, function (tbody) {
       let example_table_html = '';
-      Array.from({ length: 15 }).forEach((row, rowIndex) => {
+      Array.apply(null, { length: 15 }).forEach(function (row, rowIndex) {
         let tds = '';
-        Array.from({ length: 4 }).forEach((col, colIndex) => {
-          tds += `<td>${rowIndex + 1} - ${colIndex + 1}</td>`
+        Array.apply(null, { length: 4 }).forEach(function (col, colIndex) {
+          tds += '<td>' + (rowIndex + 1) + '-' + (colIndex + 1) + '</td>'
         });
-        example_table_html += `<tr>${tds}</tr>`;
+        example_table_html += '<tr>' + tds + '</tr>';
       });
       tbody.innerHTML = example_table_html;
     });
 
     // 样式
-    (() => {
+    (function () {
       new XScrollbar(document.getElementById('red_container'), { autoHide: false });
       new XScrollbar(document.getElementById('blue_container'), { autoHide: false });
       new XScrollbar(document.getElementById('right_container'), { autoHide: false });
@@ -358,57 +372,57 @@ new XScrollbar(dom: HTMLElement, options?: object)
     })();
 
     // 基础示例
-    (() => {
+    (function () {
       let $example_container = document.querySelector('#example_container');
       let $example_table_tbody = document.querySelector('.example_table > tbody');
 
       // 初始化滚动条
-      document.querySelector('#new').addEventListener('click', (e) => {
+      document.querySelector('#new').addEventListener('click', function () {
         new XScrollbar($example_container, { autoHide: false });
       });
 
       //添加一行
-      document.querySelector('#add_row').addEventListener('click', (e) => {
+      document.querySelector('#add_row').addEventListener('click', function () {
         let tr = document.createElement('tr');
         let trIndex = $example_table_tbody.children.length;
         let tdCount = $example_table_tbody.querySelector('tr').children.length;
-        tr.innerHTML = Array.from({ length: tdCount }).map((td, tdIndex) => `<td>${trIndex + 1} - ${tdIndex + 1}</td>`).join('');
+        tr.innerHTML = Array.apply(null, { length: tdCount }).map(function (td, tdIndex) { return '<td>' + (trIndex + 1) + ' - ' + (tdIndex + 1) + '</td>' }).join('');
         $example_table_tbody.appendChild(tr);
       });
 
       //添加一列
-      document.querySelector('#add_col').addEventListener('click', (e) => {
+      document.querySelector('#add_col').addEventListener('click', function () {
         let tdIndex = $example_table_tbody.querySelector('tr').children.length;
-        Array.from($example_table_tbody.children).forEach((tr, trIndex) => {
+        Array.prototype.forEach.call($example_table_tbody.children, function (tr, trIndex) {
           let td = document.createElement('td');
-          td.innerText = `${trIndex + 1} - ${tdIndex + 1}`;
+          td.innerText = (trIndex + 1) + ' - ' + (tdIndex + 1);
           tr.appendChild(td);
         });
       });
 
       //删除一行
-      document.querySelector('#remove_row').addEventListener('click', (e) => {
+      document.querySelector('#remove_row').addEventListener('click', function () {
         if ($example_table_tbody.children.length == 1) return;
         let tr = $example_table_tbody.querySelector('tr:last-child');
         $example_table_tbody.removeChild(tr);
       });
 
       //删除一列
-      document.querySelector('#remove_col').addEventListener('click', (e) => {
+      document.querySelector('#remove_col').addEventListener('click', function () {
         let tdCount = $example_table_tbody.querySelector('tr').children.length;
         if (tdCount == 1) return;
         let tds = $example_table_tbody.querySelectorAll('td:last-child');
-        Array.from(tds).forEach(td => td.parentNode.removeChild(td));
+        Array.prototype.forEach.call(tds, function (td) { td.parentNode.removeChild(td) });
       });
 
       //设置 ScrollLeft
-      document.querySelector('#set_scrollLeft').addEventListener('click', (e) => {
+      document.querySelector('#set_scrollLeft').addEventListener('click', function () {
         let value = window.prompt('请输入要设置的 scrollLeft', $example_container.scrollLeft);
         $example_container.scrollLeft = value;
       });
 
       //设置 ScrollTop
-      document.querySelector('#set_scrollTop').addEventListener('click', (e) => {
+      document.querySelector('#set_scrollTop').addEventListener('click', function () {
         let value = window.prompt('请输入要设置的 scrollTop', $example_container.scrollTop);
         $example_container.scrollTop = value;
       });
diff --git a/markdown/README.md b/markdown/README.md
index 7f6f0bd9e1f8fe7c9bcd7f53acde9d1351732538..9f4827836613dd19efe86447bf2d89b2c46c325f 100644
--- a/markdown/README.md
+++ b/markdown/README.md
@@ -8,8 +8,6 @@
 [![gzip size](https://badgen.net/badgesize/gzip/https://cdn.jsdelivr.net/npm/marked/marked.min.js)](https://cdn.jsdelivr.net/npm/marked/marked.min.js)
 [![install size](https://badgen.net/packagephobia/install/marked)](https://packagephobia.now.sh/result?p=marked)
 [![downloads](https://badgen.net/npm/dt/marked)](https://www.npmjs.com/package/marked)
-[![dep](https://badgen.net/david/dep/markedjs/marked?label=deps)](https://david-dm.org/markedjs/marked)
-[![dev dep](https://badgen.net/david/dev/markedjs/marked?label=devDeps)](https://david-dm.org/markedjs/marked?type=dev)
 [![github actions](https://github.com/markedjs/marked/workflows/Tests/badge.svg)](https://github.com/markedjs/marked/actions)
 [![snyk](https://snyk.io/test/npm/marked/badge.svg)](https://snyk.io/test/npm/marked)
 
diff --git a/markdown/marked.min.js b/markdown/marked.min.js
index 4cf8ded3e9f9e741d88e1a413e38bd3ccea4120e..70b18ea7d9d26837d526809a92bb9206d563b0b0 100644
--- a/markdown/marked.min.js
+++ b/markdown/marked.min.js
@@ -1,6 +1,6 @@
 /**
  * marked - a markdown parser
- * Copyright (c) 2011-2020, Christopher Jeffrey. (MIT Licensed)
+ * Copyright (c) 2011-2021, Christopher Jeffrey. (MIT Licensed)
  * https://github.com/markedjs/marked
  */
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t,n,r,i,s,l,a,D,o,c,h,p,g,f,F,A="",C=e.length,d=0;d<C;d++)switch((D=e[d]).type){case"space":continue;case"hr":A+=this.renderer.hr();continue;case"heading":A+=this.renderer.heading(this.parseInline(D.tokens),D.depth,Y(this.parseInline(D.tokens,this.textRenderer)),this.slugger);continue;case"code":A+=this.renderer.code(D.text,D.lang,D.escaped);continue;case"table":for(l=o="",r=D.header.length,t=0;t<r;t++)l+=this.renderer.tablecell(this.parseInline(D.tokens.header[t]),{header:!0,align:D.align[t]});for(o+=this.renderer.tablerow(l),a="",r=D.cells.length,t=0;t<r;t++){for(l="",i=(s=D.tokens.cells[t]).length,n=0;n<i;n++)l+=this.renderer.tablecell(this.parseInline(s[n]),{header:!1,align:D.align[n]});a+=this.renderer.tablerow(l)}A+=this.renderer.table(o,a);continue;case"blockquote":a=this.parse(D.tokens),A+=this.renderer.blockquote(a);continue;case"list":for(o=D.ordered,E=D.start,c=D.loose,r=D.items.length,a="",t=0;t<r;t++)g=(p=D.items[t]).checked,f=p.task,h="",p.task&&(F=this.renderer.checkbox(g),c?0<p.tokens.length&&"text"===p.tokens[0].type?(p.tokens[0].text=F+" 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\ No newline at end of file
diff --git a/package.json b/package.json
index 4469fb390bd95c5939b48e6e49bceaa7edbcc01e..070a70ff36cec08c1ca58c28adc2bdb8f5c1629e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "x-scrollbar",
-  "version": "2.2.1",
+  "version": "2.3.0",
   "description": "这是一个自定义滚动条插件",
   "homepage": "https://gitee.com/null_720_0252/x-scrollbar",
   "main": "xscrollbar.js",
diff --git a/xscrollbar.js b/xscrollbar.js
index c9d7478af2805b0b131d88da7e11f3c5da2a4646..9d4b05d301fb91b494a6ab87992564ea33fe9668 100644
--- a/xscrollbar.js
+++ b/xscrollbar.js
@@ -1,404 +1,444 @@
 /*!
  * x-scrollbar 自定义滚动条插件
- * 版本: v2.2.1
+ * 版本: v2.3.0
  * 作者: 清晨的阳光(QQ:765550360)
  * 许可: MIT
  * https://gitee.com/null_720_0252/x-scrollbar
  */
-class XScrollbar {
-  /**
-   * @param {*} dom DOM元素
-   * @param {*} options 选项
-   */
-  constructor(dom, options) {
-    this.$container = dom;
-    if (this.$container.classList.contains('x-scrollbar-container')) return;
-
-    // 移动端检测
-    this.isMobile = window.navigator.userAgent.toLowerCase().includes('mobile');
-    if (this.isMobile) return;
-
-    // 合并配置
-    let defaultOptions = {
-      // 禁用Y轴滚动(拨动鼠标滚轮时将作用于X轴)
-      disabledScrollY: false,
-      // 响应容器和内容大小改变(自动更新滚动条)
-      autoUpdate: true,
-      // 自动隐藏
-      autoHide: true,
-      // 阻止向上传递滚动事件
-      preventDefault: true,
-      // 平滑滚动
-      smooth: true,
-    };
-    Object.assign(this, defaultOptions, options);
-
-    // 构造dom
-    this.$content = this.html2dom('<div class="x-scrollbar__content"></div>');
-    this.$railX = this.html2dom('<div class="x-scrollbar__rail-x"></div>');
-    this.$railY = this.html2dom('<div class="x-scrollbar__rail-y"></div>');
-    this.$thumbX = this.html2dom('<div class="x-scrollbar__thumb-x"></div>');
-    this.$thumbY = this.html2dom('<div class="x-scrollbar__thumb-y"></div>');
-    this.$railX.appendChild(this.$thumbX);
-    this.$railY.appendChild(this.$thumbY);
-    Array.from(this.$container.childNodes).forEach(node => this.$content.appendChild(node));
-    this.$container.appendChild(this.$content);
-    this.$container.appendChild(this.$railX);
-    this.$container.appendChild(this.$railY);
 
-    // 自动隐藏
-    this.$container.classList.add('x-scrollbar-container');
-    if (!this.autoHide) this.$container.classList.add('x-scrollbar-keep');
-
-    // 绑定事件
-    this.bindDrag();
-    this.bindWheel();
-    this.bindScroll();
-
-    // 自动更新
-    if (this.autoUpdate) {
-      this.resizeObserver();
-    } else {
-      this.update();
-    }
-  }
+if (typeof exports === 'object' && typeof module !== 'undefined') {
+  module.exports = XScrollbar;
+} else {
+  window.XScrollbar = XScrollbar;
+}
 
-  /**
-   * 设置滑块大小
-   */
-  setThumbSize() {
-    // (clientWidth / scrollWidth) = (滑块大小 / clientWidth)
-    // 最大滑动距离 = clientWidth - 滑块大小
-    // 最大滚动距离 = scrollWidth - clientWidth
-    // (滑动距离 / 最大滑动距离) = (滚动距离 / 最大滚动距离)
-
-    // 容器大小
-    this.clientWidth = this.$container.clientWidth;
-    this.clientHeight = this.$container.clientHeight;
-    // 内容大小
-    this.scrollWidth = this.$container.scrollWidth;
-    this.scrollHeight = this.$container.scrollHeight;
-    //是否存在滚动条
-    this.hasXScrollbar = this.scrollWidth > this.clientWidth;
-    this.hasYScrollbar = this.scrollHeight > this.clientHeight;
-    //滑块大小
-    this.thumbXWidth = Math.max((this.clientWidth / this.scrollWidth) * this.clientWidth, 30);
-    this.thumbYHeight = Math.max((this.clientHeight / this.scrollHeight) * this.clientHeight, 30);
-    //最大滑动距离
-    this.thumbXMaxLeft = this.clientWidth - this.thumbXWidth;
-    this.thumbYMaxTop = this.clientHeight - this.thumbYHeight;
-    //最大滚动距离
-    this.maxScrollLeft = this.scrollWidth - this.clientWidth;
-    this.maxScrollTop = this.scrollHeight - this.clientHeight;
-
-    this.$railX.style.display = this.hasXScrollbar ? null : 'none';
-    this.$railY.style.display = this.hasYScrollbar ? null : 'none';
-    this.$thumbX.style.width = this.thumbXWidth + 'px';
-    this.$thumbY.style.height = this.thumbYHeight + 'px';
+/**
+ * @param {*} dom DOM元素
+ * @param {*} options 选项
+ */
+function XScrollbar(dom, options) {
+  this.$container = dom;
+  if (this.$container.classList.contains('x-scrollbar-container')) return;
+
+  // 移动端检测
+  this.isMobile = window.navigator.userAgent.toLowerCase().indexOf('mobile') != -1;
+  if (this.isMobile) return;
+
+  // 合并配置
+  var defaultOptions = {
+    // 禁用Y轴滚动(拨动鼠标滚轮时将作用于X轴)
+    disabledScrollY: false,
+    // 响应容器和内容大小改变(自动更新滚动条)
+    autoUpdate: true,
+    // 自动隐藏
+    autoHide: true,
+    // 阻止向上传递滚动事件
+    preventDefault: true,
+    // 平滑滚动
+    smooth: true
+  };
+  this.assign(defaultOptions, options);
+  this.assign(this, defaultOptions);
+
+  // 构造dom
+  this.$content = this.html2dom('<div class="x-scrollbar__content"></div>');
+  this.$railX = this.html2dom('<div class="x-scrollbar__rail-x"></div>');
+  this.$railY = this.html2dom('<div class="x-scrollbar__rail-y"></div>');
+  this.$thumbX = this.html2dom('<div class="x-scrollbar__thumb-x"></div>');
+  this.$thumbY = this.html2dom('<div class="x-scrollbar__thumb-y"></div>');
+  this.$railX.appendChild(this.$thumbX);
+  this.$railY.appendChild(this.$thumbY);
+  var childNodes = [];
+  Array.prototype.forEach.call(this.$container.childNodes, function(node) { childNodes.push(node) });
+  childNodes.forEach((function (node) { this.$content.appendChild(node); }).bind(this));
+  this.$container.appendChild(this.$content);
+  this.$container.appendChild(this.$railX);
+  this.$container.appendChild(this.$railY);
+
+  // 自动隐藏
+  this.$container.classList.add('x-scrollbar-container');
+  if (!this.autoHide) this.$container.classList.add('x-scrollbar-keep');
+
+  // 绑定事件
+  this.bindDrag();
+  this.bindWheel();
+  this.bindScroll();
+
+  // 自动更新
+  if (this.autoUpdate) {
+    // 首次自动触发
+    this.resizeObserver();
+  } else {
+    this.update();
   }
+}
 
-  /**
-   * 拖动
-   */
-  bindDrag() {
-    // 是否被拖动选定
-    let thumbXActive = false;
-    let thumbYActive = false;
-    // 上一次的拖动位置
-    let screenX = null;
-    let screenY = null;
-
-    this.$thumbX.addEventListener('mousedown', (e) => {
-      this.$railX.classList.add('x-scrollbar__rail-draging');
-      thumbXActive = true;
+/**
+ * 设置滑块大小
+ */
+XScrollbar.prototype.setThumbSize = function () {
+  // (clientWidth / scrollWidth) = (滑块大小 / clientWidth)
+  // 最大滑动距离 = clientWidth - 滑块大小
+  // 最大滚动距离 = scrollWidth - clientWidth
+  // (滑动距离 / 最大滑动距离) = (滚动距离 / 最大滚动距离)
+
+  // 容器大小
+  this.clientWidth = this.$container.clientWidth;
+  this.clientHeight = this.$container.clientHeight;
+  // 内容大小
+  this.scrollWidth = this.$container.scrollWidth;
+  this.scrollHeight = this.$container.scrollHeight;
+  //是否存在滚动条
+  this.hasXScrollbar = this.scrollWidth > this.clientWidth;
+  this.hasYScrollbar = this.scrollHeight > this.clientHeight;
+  //滑块大小
+  this.thumbXWidth = Math.max((this.clientWidth / this.scrollWidth) * this.clientWidth, 30);
+  this.thumbYHeight = Math.max((this.clientHeight / this.scrollHeight) * this.clientHeight, 30);
+  //最大滑动距离
+  this.thumbXMaxLeft = this.clientWidth - this.thumbXWidth;
+  this.thumbYMaxTop = this.clientHeight - this.thumbYHeight;
+  //最大滚动距离
+  this.maxScrollLeft = this.scrollWidth - this.clientWidth;
+  this.maxScrollTop = this.scrollHeight - this.clientHeight;
+  
+  this.$railX.style.display = this.hasXScrollbar ? 'block' : 'none';
+  this.$railY.style.display = this.hasYScrollbar ? 'block' : 'none';
+  this.$thumbX.style.width = this.thumbXWidth + 'px';
+  this.$thumbY.style.height = this.thumbYHeight + 'px';
+};
+
+/**
+ * 拖动
+ */
+XScrollbar.prototype.bindDrag = function () {
+  // 是否被拖动选定
+  var thumbXActive = false;
+  var thumbYActive = false;
+  // 上一次的拖动位置
+  var screenX = null;
+  var screenY = null;
+
+  this.$thumbX.addEventListener('mousedown', (function (e) {
+    this.$railX.classList.add('x-scrollbar__rail-draging');
+    thumbXActive = true;
+    screenX = e.screenX;
+  }).bind(this));
+
+  this.$thumbY.addEventListener('mousedown', (function (e) {
+    this.$railY.classList.add('x-scrollbar__rail-draging');
+    thumbYActive = true;
+    screenY = e.screenY;
+  }).bind(this));
+
+  this.scrollDocumentMouseup = (function (e) {
+    this.$railX.classList.remove('x-scrollbar__rail-draging');
+    this.$railY.classList.remove('x-scrollbar__rail-draging');
+    thumbXActive = false;
+    thumbYActive = false;
+  }).bind(this);
+  document.addEventListener('mouseup', this.scrollDocumentMouseup);
+
+  this.scrollDocumentMousemove = (function (e) {
+    if (!(thumbXActive || thumbYActive)) return;
+    e.preventDefault();
+
+    var axis = null;
+    var positionValue = null;
+    var scrollValue = null;
+
+    if (thumbXActive) {
+      var offset = e.screenX - screenX;
       screenX = e.screenX;
-    });
-
-    this.$thumbY.addEventListener('mousedown', (e) => {
-      this.$railY.classList.add('x-scrollbar__rail-draging');
-      thumbYActive = true;
+      axis = 'x';
+      positionValue = Math.max(Math.min((this.left || 0) + offset, this.thumbXMaxLeft), 0);
+      scrollValue = Number(positionValue / this.thumbXMaxLeft * this.maxScrollLeft);
+    } else {
+      var offset = e.screenY - screenY;
       screenY = e.screenY;
-    });
-
-    this.scrollDocumentMouseup = (e) => {
-      this.$railX.classList.remove('x-scrollbar__rail-draging');
-      this.$railY.classList.remove('x-scrollbar__rail-draging');
-      thumbXActive = false;
-      thumbYActive = false;
-    };
-    document.addEventListener('mouseup', this.scrollDocumentMouseup);
-
-    this.scrollDocumentMousemove = (e) => {
-      if (!(thumbXActive || thumbYActive)) return;
-      e.preventDefault();
+      axis = 'y';
+      positionValue = Math.max(Math.min((this.top || 0) + offset, this.thumbYMaxTop), 0);
+      scrollValue = Number(positionValue / this.thumbYMaxTop * this.maxScrollTop);
+    }
 
-      let axis = null;
-      let positionValue = null;
-      let scrollValue = null;
+    this.scroll(axis, positionValue, scrollValue);
+  }).bind(this);
+  document.addEventListener('mousemove', this.scrollDocumentMousemove);
+};
 
-      if (thumbXActive) {
-        let offset = e.screenX - screenX;
-        screenX = e.screenX;
-        axis = 'x';
-        positionValue = Math.max(Math.min((this.left || 0) + offset, this.thumbXMaxLeft), 0);
-        scrollValue = Number(positionValue / this.thumbXMaxLeft * this.maxScrollLeft);
-      } else {
-        let offset = e.screenY - screenY;
-        screenY = e.screenY;
-        axis = 'y';
-        positionValue = Math.max(Math.min((this.top || 0) + offset, this.thumbYMaxTop), 0);
-        scrollValue = Number(positionValue / this.thumbYMaxTop * this.maxScrollTop);
-      }
+/**
+ * 滚动
+ */
+XScrollbar.prototype.bindWheel = function () {
+  var onWheel = (function (e, axis, delta) {
+    // 将滚动量转为像数值(https://developer.mozilla.org/zh-CN/docs/Web/API/Element/wheel_event)
+    if (e.deltaMode != 0) {
+      // 一行默认为40px
+      delta = delta * 40;
+    }
 
-      this.scroll(axis, positionValue, scrollValue);
-    };
-    document.addEventListener('mousemove', this.scrollDocumentMousemove);
-  }
+    delta = parseInt(delta);
 
-  /**
-   * 滚动
-   */
-  bindWheel() {
-    let onWheel = (e, axis, delta) => {
-      // 将滚动量转为像数值(https://developer.mozilla.org/zh-CN/docs/Web/API/Element/wheel_event)
-      if (e.deltaMode != 0) {
-        // 一行默认为40px
-        delta = delta * 40;
-      }
+    var positionValue = null;
+    var scrollValue = null;
 
-      let positionValue = null;
-      let scrollValue = null;
+    if (axis == 'x') {
+      scrollValue = Math.max(Math.min((this.scrollLeft || 0) + delta, this.maxScrollLeft), 0);
+      positionValue = Number(scrollValue / this.maxScrollLeft * this.thumbXMaxLeft);
+    } else {
+      scrollValue = Math.max(Math.min((this.scrollTop || 0) + delta, this.maxScrollTop), 0);
+      positionValue = Number(scrollValue / this.maxScrollTop * this.thumbYMaxTop);
+    }
 
-      if (axis == 'x') {
-        scrollValue = Math.max(Math.min((this.scrollLeft || 0) + delta, this.maxScrollLeft), 0);
-        positionValue = Number(scrollValue / this.maxScrollLeft * this.thumbXMaxLeft);
-      } else {
-        scrollValue = Math.max(Math.min((this.scrollTop || 0) + delta, this.maxScrollTop), 0);
-        positionValue = Number(scrollValue / this.maxScrollTop * this.thumbYMaxTop);
-      }
+    // 阻止向上传递 || !(终点)
+    var toStart = scrollValue <= 0;
+    var toEnd = scrollValue >= (axis == 'x' ? this.maxScrollLeft : this.maxScrollTop);
+    if (this.preventDefault || !(toStart || toEnd)) {
+      e.preventDefault();
+      e.stopPropagation();
+    }
 
-      // 阻止向上传递 || !(终点)
-      let toStart = scrollValue <= 0;
-      let toEnd = scrollValue >= (axis == 'x' ? this.maxScrollLeft : this.maxScrollTop);
-      if (this.preventDefault || !(toStart || toEnd)) {
-        e.preventDefault();
-        e.stopPropagation();
+    if (this.mouseType == null) {
+      if (Math.abs(delta) < 50) {
+        // 初始滚动量小于90定义为触控板
+        this.mouseType = 'touchpad';
+      } else {
+        this.mouseType = 'wheel';
       }
+    }
 
-      if (this.mouseType == null) {
-        if (Math.abs(delta) < 90) {
-          // 初始滚动量小于90定义为触控板
-          this.mouseType = 'touchpad';
-        } else {
-          this.mouseType = 'wheel';
-        }
-      }
+    this.scroll(axis, positionValue, scrollValue, (this.smooth && this.mouseType == 'wheel'));
+  }).bind(this);
 
-      this.scroll(axis, positionValue, scrollValue, (this.smooth && this.mouseType == 'wheel'));
-    };
 
-    this.onWheel = (e) => {
-      // e.deltaX 正值向下, 负值向上
-      if (e.deltaX != 0 && this.hasXScrollbar) {
-        onWheel(e, 'x', e.deltaX);
-      }
-      if (e.deltaY != 0) {
-        // (shift键被按下 或 禁用Y轴滚动), 作用于x轴
-        if ((e.deltaX == 0) && (e.shiftKey || this.disabledScrollY) && this.hasXScrollbar) {
-          onWheel(e, 'x', e.deltaY);
-        } else if (this.hasYScrollbar) {
-          onWheel(e, 'y', e.deltaY);
-        }
+  this.onWheel = (function (e) {
+    // e.deltaX 正值向下, 负值向上
+    if (e.deltaX != 0 && this.hasXScrollbar) {
+      onWheel(e, 'x', e.deltaX);
+    }
+    if (e.deltaY != 0) {
+      // (shift键被按下 或 禁用Y轴滚动), 作用于x轴
+      if ((e.deltaX == 0) && (e.shiftKey || this.disabledScrollY) && this.hasXScrollbar) {
+        onWheel(e, 'x', e.deltaY);
+      } else if (this.hasYScrollbar) {
+        onWheel(e, 'y', e.deltaY);
       }
-    };
-    this.$container.addEventListener('wheel', this.onWheel, { passive: false });
+    }
+  }).bind(this);
+  this.$container.addEventListener('wheel', this.onWheel);
+};
+
+/**
+ * 监听滚动事件
+ * 用于响应从外部设置 scrollLeft/scrollTop 修正滚动条
+ */
+XScrollbar.prototype.bindScroll = function () {
+  this.onScroll = (function (e) {
+    if (this.innerScroll) return;
+    this.update();
+  }).bind(this);
+  this.$container.addEventListener('scroll', this.onScroll);
+};
+
+/**
+ * 滚动、修正滑块
+ * @param {*} axis 
+ * @param {*} positionValue 
+ * @param {*} scrollValue 
+ * @param {*} smooth = false
+ */
+XScrollbar.prototype.scroll = function (axis, positionValue, scrollValue, smooth) {
+  // 起始值
+  var left = this.left;
+  var scrollLeft = this.scrollLeft;
+  var top = this.top;
+  var scrollTop = this.scrollTop;
+
+  // 结束值
+  if (axis == 'x') {
+    this.left = positionValue;
+    this.scrollLeft = scrollValue;
+  } else {
+    this.top = positionValue;
+    this.scrollTop = scrollValue;
   }
 
-  /**
-   * 监听滚动事件
-   * 用于响应从外部设置 scrollLeft/scrollTop 修正滚动条
-   */
-  bindScroll() {
-    this.onScroll = (e) => {
-      if (this.innerScroll) return;
-      this.update();
-    };
-    this.$container.addEventListener('scroll', this.onScroll);
+  if (axis == 'x') {
+    if (this.xRefId) return;
+  } else {
+    if (this.yRefId) return;
   }
 
-  /**
-   * 滚动、修正滑块
-   * @param {*} axis 
-   * @param {*} positionValue 
-   * @param {*} scrollValue 
-   * @param {*} smooth 
-   */
-  scroll(axis, positionValue, scrollValue, smooth = false) {
-    // 起始值
-    let left = this.left;
-    let scrollLeft = this.scrollLeft;
-    let top = this.top;
-    let scrollTop = this.scrollTop;
-
-    // 结束值
-    if (axis == 'x') {
-      this.left = positionValue;
-      this.scrollLeft = scrollValue;
-    } else {
-      this.top = positionValue;
-      this.scrollTop = scrollValue;
+  var end = (function () {
+    if (!(this.xRefId || this.yRefId)) {
+      requestAnimationFrame((function () { this.innerScroll = false }).bind(this));
     }
+  }).bind(this);
+
+  var animate = (function () {
+    // 从组件内部触发的滚动事件
+    this.innerScroll = true;
 
     if (axis == 'x') {
-      if (this.xRefId) return;
+      left = this.easeout(left, this.left, smooth);
+      scrollLeft = this.easeout(scrollLeft, this.scrollLeft, smooth);
+
+      // 滑块
+      this.$thumbX.style.left = left + 'px';
+      // 滚动
+      this.$container.scrollLeft = scrollLeft;
+      // 轨道
+      this.$railX.style.left = scrollLeft + 'px';
+      this.$railY.style.right = (-scrollLeft) + 'px';
+
+      if (Math.abs(scrollLeft - this.scrollLeft) >= 1) {
+        this.xRefId = requestAnimationFrame(animate);
+      } else {
+        this.xRefId = null;
+        end();
+      }
     } else {
-      if (this.yRefId) return;
-    }
+      top = this.easeout(top, this.top, smooth);
+      scrollTop = this.easeout(scrollTop, this.scrollTop, smooth);
 
-    let end = () => {
-      if (!(this.xRefId || this.yRefId)) {
-        requestAnimationFrame(() => this.innerScroll = false);
-      }
-    };
-
-    let animate = () => {
-      // 从组件内部触发的滚动事件
-      this.innerScroll = true;
-
-      if (axis == 'x') {
-        left = this.easeout(left, this.left, smooth);
-        scrollLeft = this.easeout(scrollLeft, this.scrollLeft, smooth);
-
-        // 滑块
-        this.$thumbX.style.left = `${left}px`;
-        // 滚动
-        this.$container.scrollLeft = scrollLeft;
-        // 轨道
-        this.$railX.style.left = `${scrollLeft}px`;
-        this.$railY.style.right = `${-(scrollLeft)}px`;
-
-        if (Math.abs(scrollLeft - this.scrollLeft) >= 1) {
-          this.xRefId = requestAnimationFrame(animate);
-        } else {
-          this.xRefId = null;
-          end();
-        }
+      this.$thumbY.style.top = top + 'px';
+      this.$container.scrollTop = scrollTop;
+      this.$railX.style.bottom = (-scrollTop) + 'px';
+      this.$railY.style.top = scrollTop + 'px';
+
+      if (Math.abs(scrollTop - this.scrollTop) >= 1) {
+        this.yRefId = requestAnimationFrame(animate);
       } else {
-        top = this.easeout(top, this.top, smooth);
-        scrollTop = this.easeout(scrollTop, this.scrollTop, smooth);
-
-        this.$thumbY.style.top = `${top}px`;
-        this.$container.scrollTop = scrollTop;
-        this.$railX.style.bottom = `${-(scrollTop)}px`;
-        this.$railY.style.top = `${scrollTop}px`;
-
-        if (Math.abs(scrollTop - this.scrollTop) >= 1) {
-          this.yRefId = requestAnimationFrame(animate);
-        } else {
-          this.yRefId = null;
-          end();
-        }
+        this.yRefId = null;
+        end();
       }
-    };
-    requestAnimationFrame(animate);
-  }
-
-  /**
-   * 缓动效果
-   * @param {*} start 
-   * @param {*} end 
-   * @param {*} smooth 
-   * @returns 
-   */
-  easeout(start, end, smooth) {
-    let v = null;
-
-    if (!smooth || (Math.abs(end - start) <= 1)) {
-      v = end;
-    } else {
-      v = start + (end - start) / 4;
     }
+  }).bind(this);
+  requestAnimationFrame(animate);
+};
+
+/**
+ * 缓动效果
+ * @param {*} start 
+ * @param {*} end 
+ * @param {*} smooth 
+ * @returns 
+ */
+XScrollbar.prototype.easeout = function (start, end, smooth) {
+  var v = null;
 
-    if ((end - start) > 0) {
-      return Math.ceil(v);
-    } else {
-      return Math.floor(v);
-    }
+  if (!smooth || (Math.abs(end - start) <= 1)) {
+    v = end;
+  } else {
+    v = start + (end - start) / 4;
   }
 
-  /**
-   * 使用滚动值修正滑块
-   * 在 容器大小 或 内容大小 发生改变时调用
-   */
-  update() {
-    if (this.isMobile) return;
+  if ((end - start) > 0) {
+    return Math.ceil(v);
+  } else {
+    return Math.floor(v);
+  }
+};
 
-    // 先重置以更新滚动条的位置
-    this.$railX.style.display = 'none';
-    this.$railY.style.display = 'none';
-    let scrollLeft = this.$container.scrollLeft;
-    let scrollTop = this.$container.scrollTop;
+/**
+ * 使用滚动值修正滑块
+ * 在 容器大小 或 内容大小 发生改变时调用
+ */
+XScrollbar.prototype.update = function () {
+  if (this.isMobile) return;
 
-    this.setThumbSize();
+  // 先重置以更新滚动条的位置
+  this.$railX.style.display = 'none';
+  this.$railY.style.display = 'none';
+  var scrollLeft = this.$container.scrollLeft;
+  var scrollTop = this.$container.scrollTop;
 
-    let positionLeft = Number(scrollLeft / this.maxScrollLeft * this.thumbXMaxLeft) || 0;
-    this.scroll('x', positionLeft, scrollLeft);
+  this.setThumbSize();
 
-    let positionTop = Number(scrollTop / this.maxScrollTop * this.thumbYMaxTop) || 0;
-    this.scroll('y', positionTop, scrollTop);
-  }
+  var positionLeft = Number(scrollLeft / this.maxScrollLeft * this.thumbXMaxLeft) || 0;
+  this.scroll('x', positionLeft, scrollLeft);
+
+  var positionTop = Number(scrollTop / this.maxScrollTop * this.thumbYMaxTop) || 0;
+  this.scroll('y', positionTop, scrollTop);
+};
 
-  /**
-   * 响应容器和内容大小改变, 自动更新滚动条
-   */
-  resizeObserver() {
-    this.resizeObserver = new ResizeObserver(entries => {
-      let contentRect = entries[0].contentRect;
+/**
+ * 响应容器和内容大小改变, 自动更新滚动条
+ */
+XScrollbar.prototype.resizeObserver = function () {
+  if (typeof ResizeObserver != 'undefined') {
+    this.resizeObserver = new ResizeObserver((function (entries) {
+      var contentRect = entries[0].contentRect;
       if (!(contentRect.width || contentRect.height)) return;
       this.update();
-    });
+    }).bind(this));
     this.resizeObserver.observe(this.$container);
     this.resizeObserver.observe(this.$content);
+    return;
   }
 
-  /**
-   * 销毁
-   * @returns 
-   */
-  destroy() {
-    if (this.isMobile) return;
-    this.resizeObserver.disconnect();
-    this.$container.classList.remove('x-scrollbar-container');
-    this.$container.classList.remove('x-scrollbar-keep');
-    Array.from(this.$content.childNodes).forEach(node => this.$container.appendChild(node));
-    this.$container.removeChild(this.$content);
-    this.$container.removeChild(this.$railX);
-    this.$container.removeChild(this.$railY);
-    document.removeEventListener('mouseup', this.scrollDocumentMouseup);
-    document.removeEventListener('mousemove', this.scrollDocumentMousemove);
-    this.$container.removeEventListener('wheel', this.wheel);
-    this.$container.removeEventListener('scroll', this.onScroll);
-  }
-
-  /**
-   * html 转 dom
-   * @param {*} html 
-   * @returns 
-   */
-  html2dom(html) {
-    let element = document.createElement('div');
-    element.innerHTML = html;
-    let children = Array.from(element.children);
-    if (children.length <= 1) {
-      return children[0];
-    } else {
-      return children;
+  var containerRect = this.$container.getBoundingClientRect();
+  var contentRect = this.$content.getBoundingClientRect();
+  var resizeObserver = (function () {
+    var _containerRect = this.$container.getBoundingClientRect();
+    var _contentRect = this.$content.getBoundingClientRect();
+    if ((containerRect.width != _containerRect.width) || (containerRect.height != _containerRect.height) || (contentRect.width != _contentRect.width) || (contentRect.height != _contentRect.height)) {
+      this.update();
     }
+    containerRect = _containerRect;
+    contentRect = _contentRect;
+    requestAnimationFrame(resizeObserver);
+  }).bind(this);
+  requestAnimationFrame(resizeObserver);
+  this.update();
+};
+
+/**
+ * 销毁
+ */
+XScrollbar.prototype.destroy = function () {
+  if (this.isMobile) return;
+  this.resizeObserver.disconnect();
+  this.$container.classList.remove('x-scrollbar-container');
+  this.$container.classList.remove('x-scrollbar-keep');
+  var childNodes = [];
+  Array.prototype.forEach.call(this.$container.content, function(node) { childNodes.push(node) });
+  childNodes.forEach((function (node) { this.$container.appendChild(node) }).bind(this));
+  this.$container.removeChild(this.$content);
+  this.$container.removeChild(this.$railX);
+  this.$container.removeChild(this.$railY);
+  document.removeEventListener('mouseup', this.scrollDocumentMouseup);
+  document.removeEventListener('mousemove', this.scrollDocumentMousemove);
+  this.$container.removeEventListener('wheel', this.wheel);
+  this.$container.removeEventListener('scroll', this.onScroll);
+};
+
+/**
+ * html 转 dom
+ * @param {*} html 
+ * @returns 
+ */
+XScrollbar.prototype.html2dom = function (html) {
+  var element = document.createElement('div');
+  element.innerHTML = html;
+  var children = element.children;
+  if (children.length <= 1) {
+    return children[0];
+  } else {
+    return children;
   }
-}
+};
 
-if (typeof exports === 'object' && typeof module !== 'undefined') {
-  module.exports = XScrollbar;
-} else {
-  window.XScrollbar = XScrollbar;
-}
\ No newline at end of file
+/**
+ * 合并配置
+ * @param {*} target 
+ * @param {*} source 
+ * @returns 
+ */
+XScrollbar.prototype.assign = function (target, source) {
+  target = target || {};
+  source = source || {};
+  for (key in source) {
+    target[key] = source[key];
+  }
+  return target;
+};
\ No newline at end of file