diff --git a/assets/scripts/editor.js b/assets/scripts/editor.js
index 3aa4e34..ac810d5 100644
--- a/assets/scripts/editor.js
+++ b/assets/scripts/editor.js
@@ -6,9 +6,9 @@ let app = new Vue({
       output: '',
       source: '',
       editorThemes: [
-        { label: '淡雅', value: 'xq-light'},
-        { label: '精美', value: 'eclipse'},
-        { label: '暗绿', value: 'oceanic-next'}
+        { label: '淡雅', value: 'xq-light' },
+        { label: '精美', value: 'eclipse' },
+        { label: '暗绿', value: 'oceanic-next' }
       ],
       editor: null,
       builtinFonts: [
@@ -28,8 +28,8 @@ let app = new Vue({
       ],
       colorOption: [
         { label: '橘红', value: 'rgba(255, 95, 46, 0.9)', hex: '#FF5F2E' },
-        { label: '淡绿', value: 'rgba(66, 185, 131, 0.9)', hex: '#42B983'},
-        { label: '暗青', value: 'rgba(0, 139, 139, 0.9)', hex: '#008B8B'}
+        { label: '淡绿', value: 'rgba(66, 185, 131, 0.9)', hex: '#42B983' },
+        { label: '暗青', value: 'rgba(0, 139, 139, 0.9)', hex: '#008B8B' }
       ],
       aboutDialogVisible: false
     };
@@ -40,7 +40,6 @@ let app = new Vue({
     return d;
   },
   mounted() {
-    let self = this;
     this.editor = CodeMirror.fromTextArea(
       document.getElementById('editor'),
       {
@@ -51,9 +50,9 @@ let app = new Vue({
         mode: 'text/x-markdown',
       }
     );
-    this.editor.on("change", function (cm, change) {
-      self.refresh();
-      self.saveEditorContent();
+    this.editor.on("change", (cm, change) => {
+      this.refresh();
+      this.saveEditorContent();
     });
     this.wxRenderer = new WxRenderer({
       theme: setColor(this.currentColor),
@@ -67,13 +66,13 @@ let app = new Vue({
       axios({
         method: 'get',
         url: './assets/default-content.md',
-      }).then(function (resp) {
-        self.editor.setValue(resp.data)
+      }).then(resp => {
+        this.editor.setValue(resp.data)
       })
     }
   },
   methods: {
-    renderWeChat: function (source) {
+    renderWeChat(source) {
       let output = marked(source, { renderer: this.wxRenderer.getRenderer() });
       if (this.wxRenderer.hasFootnotes()) {
         // 去除第一行的 margin-top
@@ -85,22 +84,22 @@ let app = new Vue({
       }
       return output
     },
-    editorThemeChanged: function (editorTheme) {
+    editorThemeChanged(editorTheme) {
       this.editor.setOption('theme', editorTheme)
     },
-    fontChanged: function (fonts) {
+    fontChanged(fonts) {
       this.wxRenderer.setOptions({
         fonts: fonts
       });
       this.refresh()
     },
-    sizeChanged: function (size) {
+    sizeChanged(size) {
       this.wxRenderer.setOptions({
         size: size
       });
       this.refresh()
     },
-    colorChanged: function (color) {
+    colorChanged(color) {
       let theme = setColor(color)
       this.wxRenderer.setOptions({
         theme: theme
@@ -108,19 +107,19 @@ let app = new Vue({
       this.refresh()
     },
     // 刷新右侧预览
-    refresh: function () {
+    refresh() {
       this.output = this.renderWeChat(this.editor.getValue(0))
     },
     // 将左侧编辑器内容保存到 LocalStorage
-    saveEditorContent: function () {
+    saveEditorContent() {
       let content = this.editor.getValue(0);
-      if (content){
+      if (content) {
         localStorage.setItem("__editor_content", content);
       } else {
         localStorage.removeItem("__editor_content");
       }
     },
-    copy: function () {
+    copy() {
       let clipboardDiv = document.getElementById('output');
       clipboardDiv.focus();
       window.getSelection().removeAllRanges();
@@ -157,13 +156,13 @@ let app = new Vue({
         });
       }
     },
-    openWindow: function (url) {
+    openWindow(url) {
       window.open(url);
     }
   },
-  updated: function () {
-    this.$nextTick(function () {
-      prettyPrint()
+  updated() {
+    this.$nextTick(() => {
+      prettyPrint();
     })
   }
 });
diff --git a/assets/scripts/renderers/wx-renderer.js b/assets/scripts/renderers/wx-renderer.js
index b9f1a44..87b6725 100644
--- a/assets/scripts/renderers/wx-renderer.js
+++ b/assets/scripts/renderers/wx-renderer.js
@@ -9,11 +9,9 @@ let WxRenderer = function (opts) {
 
   let CODE_FONT_FAMILY = "Menlo, Operator Mono, Consolas, Monaco, monospace";
 
-  let merge = function (base, extend) {
-    return Object.assign({}, base, extend)
-  };
+  let merge = (base, extend) => Object.assign({}, base, extend);
 
-  this.buildTheme = function (themeTpl) {
+  this.buildTheme = themeTpl => {
     let mapping = {};
     let base = merge(themeTpl.BASE, {
       'font-family': this.opts.fonts,
@@ -30,6 +28,7 @@ let WxRenderer = function (opts) {
         mapping[ele] = merge(base, style)
       }
     }
+
     for (let ele in themeTpl.block) {
       if (themeTpl.block.hasOwnProperty(ele)) {
         let style = themeTpl.block[ele];
@@ -42,7 +41,7 @@ let WxRenderer = function (opts) {
     return mapping
   };
 
-  let getStyles = function (tokenName, addition) {
+  let getStyles = (tokenName, addition) => {
     let arr = [];
     let dict = styleMapping[tokenName];
     if (!dict) return '';
@@ -52,14 +51,13 @@ let WxRenderer = function (opts) {
     return `style="${arr.join(';') + (addition || '')}"`
   };
 
-  let addFootnote = function (title, link) {
-    footnoteIndex += 1;
-    footnotes.push([footnoteIndex, title, link]);
-    return footnoteIndex
+  let addFootnote = (title, link) => {
+    footnotes.push([++footnoteIndex, title, link]);
+    return footnoteIndex;
   };
 
-  this.buildFootnotes = function () {
-    let footnoteArray = footnotes.map(function (x) {
+  this.buildFootnotes = () => {
+    let footnoteArray = footnotes.map(x => {
       if (x[1] === x[2]) {
         return `<code style="font-size: 90%; opacity: 0.6;">[${x[0]}]</code>: <i>${x[1]}</i><br/>`
       }
@@ -68,31 +66,33 @@ let WxRenderer = function (opts) {
     return `<h4 ${getStyles('h4')}>引用链接</h4><p ${getStyles('footnotes')}>${footnoteArray.join('\n')}</p>`
   };
 
-  this.buildAddition = function () {
-    return '<style>.preview-wrapper pre::before{' +
-      'font-family:"SourceSansPro","HelveticaNeue",Arial,sans-serif;' +
-      'position:absolute;' +
-      'top:0;' +
-      'right:0;' +
-      'color:#ccc;' +
-      'text-align:right;' +
-      'font-size:0.8em;' +
-      'padding:5px10px0;' +
-      'line-height:15px;' +
-      'height:15px;' +
-      'font-weight:600;' +
-      '}</style>'
-  };
+  this.buildAddition = () => {
+    return `
+    <style>
+      .preview-wrapper pre::before {
+        font-family: "SourceSansPro", "HelveticaNeue", Arial, sans-serif;
+        position: absolute;
+        top: 0;
+        right: 0;
+        color: #ccc;
+        text-align: center;
+        font-size: 0.8em;
+        padding: 5px 10px 0;
+        line-height: 15px;
+        height: 15px;
+        font-weight: 600;
+      }
+    </style>
+    `;
+  }
 
-  this.setOptions = function (newOpts) {
+  this.setOptions = newOpts => {
     this.opts = merge(this.opts, newOpts)
   };
 
-  this.hasFootnotes = function () {
-    return footnotes.length !== 0
-  };
+  this.hasFootnotes = () => footnotes.length !== 0;
 
-  this.getRenderer = function () {
+  this.getRenderer = () => {
     footnotes = [];
     footnoteIndex = 0;
 
@@ -100,7 +100,7 @@ let WxRenderer = function (opts) {
     let renderer = new marked.Renderer();
     FuriganaMD.register(renderer);
 
-    renderer.heading = function (text, level) {
+    renderer.heading = (text, level) => {
       switch (level) {
         case 1:
           return `<h1 ${getStyles('h1')}>${text}</h1>`;
@@ -112,39 +112,40 @@ let WxRenderer = function (opts) {
           return `<h4 ${getStyles('h4')}>${text}</h4>`;
       }
     };
-    renderer.paragraph = function (text) {
-      return `<p ${getStyles('p')}>${text}</p>`
-    };
-    renderer.blockquote = function (text) {
+    renderer.paragraph = text => `<p ${getStyles('p')}>${text}</p>`;
+
+    renderer.blockquote = text => {
       text = text.replace(/<p.*?>/, `<p ${getStyles('blockquote_p')}>`);
       return `<blockquote ${getStyles('blockquote')}>${text}</blockquote>`
     };
-    renderer.code = function (text, infoString) {
+    renderer.code = (text, infoString) => {
       text = text.replace(/</g, "&lt;");
       text = text.replace(/>/g, "&gt;");
 
       let lines = text.split('\n');
       let codeLines = [];
       let numbers = [];
+
       for (let i = 0; i < lines.length; i++) {
         const line = lines[i];
         codeLines.push(`<code class="prettyprint"><span class="code-snippet_outer">${(line || '<br>')}</span></code>`);
         numbers.push('<li></li>')
       }
       let lang = infoString || '';
-      return `<section class="code-snippet__fix code-snippet__js">`
-        + `<ul class="code-snippet__line-index code-snippet__js">${numbers.join('')}</ul>`
-        + `<pre class="code-snippet__js" data-lang="${lang}">`
-        + codeLines.join('')
-        + `</pre></section>`
+
+      return `
+        <section class="code-snippet__fix code-snippet__js">
+            <ul class="code-snippet__line-index code-snippet__js">${numbers.join('')}</ul>
+            <pre class="code-snippet__js" data-lang="${lang}">
+                ${codeLines.join('')}
+            </pre>
+        </section>
+        `;
     };
-    renderer.codespan = function (text, infoString) {
-      return `<code ${getStyles('codespan')}>${text}</code>`
-    };
-    renderer.listitem = function (text) {
-      return `<span ${getStyles('listitem')}><span style="margin-right: 10px;"><%s/></span>${text}</span>`;
-    };
-    renderer.list = function (text, ordered, start) {
+    renderer.codespan = (text, infoString) => `<code ${getStyles('codespan')}>${text}</code>`;
+    renderer.listitem = text => `<span ${getStyles('listitem')}><span style="margin-right: 10px;"><%s/></span>${text}</span>`;
+
+    renderer.list = (text, ordered, start) => {
       text = text.replace(/<\/*p.*?>/g, '');
       let segments = text.split(`<%s/>`);
       if (!ordered) {
@@ -157,7 +158,7 @@ let WxRenderer = function (opts) {
       }
       return `<p ${getStyles('ol')}>${text}</p>`;
     };
-    renderer.image = function (href, title, text) {
+    renderer.image = (href, title, text) => {
       let subText = '';
       if (text) {
         subText = `<figcaption ${getStyles('figcaption')}>${text}</figcaption>`
@@ -166,7 +167,7 @@ let WxRenderer = function (opts) {
       let imgStyles = getStyles(ENV_STRETCH_IMAGE ? 'image' : 'image_org');
       return `<figure ${figureStyles}><img ${imgStyles} src="${href}" title="${title}" alt="${text}"/>${subText}</figure>`
     };
-    renderer.link = function (href, title, text) {
+    renderer.link = (href, title, text) => {
       if (href.indexOf('https://mp.weixin.qq.com') === 0) {
         return `<a href="${href}" title="${(title || text)}" ${getStyles('wx_link')}>${text}</a>`;
       } else if (href === text) {
@@ -180,21 +181,12 @@ let WxRenderer = function (opts) {
         }
       }
     };
-    renderer.strong = function (text) {
-      return `<strong ${getStyles('strong')}>${text}</strong>`;
-    };
-    renderer.em = function (text) {
-      return `<p ${getStyles('p', ';font-style: italic;')}>${text}</p>`
-    };
-    renderer.table = function (header, body) {
-      return `<table class="preview-table"><thead ${getStyles('thead')}>${header}</thead><tbody>${body}</tbody></table>`;
-    };
-    renderer.tablecell = function (text, flags) {
-      return `<td ${getStyles('td')}>${text}</td>`;
-    };
-    renderer.hr = function () {
-      return `<hr style="border-style: solid;border-width: 1px 0 0;border-color: rgba(0,0,0,0.1);-webkit-transform-origin: 0 0;-webkit-transform: scale(1, 0.5);transform-origin: 0 0;transform: scale(1, 0.5);">`;
-    };
+    renderer.strong = text => `<strong ${getStyles('strong')}>${text}</strong>`;
+    renderer.em = text => `<p ${getStyles('p', ';font-style: italic;')}>${text}</p>`;
+    renderer.table = (header, body) => `<table class="preview-table"><thead ${getStyles('thead')}>${header}</thead><tbody>${body}</tbody></table>`;
+    renderer.tablecell = (text, flags) => `<td ${getStyles('td')}>${text}</td>`;
+    renderer.hr = () => `<hr style="border-style: solid;border-width: 1px 0 0;border-color: rgba(0,0,0,0.1);-webkit-transform-origin: 0 0;-webkit-transform: scale(1, 0.5);transform-origin: 0 0;transform: scale(1, 0.5);">`;
+
     return renderer
   }
 };
diff --git a/assets/scripts/sync-scroll.js b/assets/scripts/sync-scroll.js
index cbcb5f3..bf454fc 100644
--- a/assets/scripts/sync-scroll.js
+++ b/assets/scripts/sync-scroll.js
@@ -1,13 +1,11 @@
 // 左右栏同步滚动
-$(document).ready(function () {
-  
+$(document).ready(() => {
   let timeout;
-
   $('div.CodeMirror-scroll, #preview').on("scroll", function callback() {
     clearTimeout(timeout);
 
-    let source = $(this),
-      target = $(source.is("#preview") ? 'div.CodeMirror-scroll' : '#preview');
+    let source = $(this), 
+        target = $(source.is("#preview") ? 'div.CodeMirror-scroll' : '#preview');
 
     target.off("scroll");
 
@@ -18,9 +16,8 @@ $(document).ready(function () {
     let height = percentage * (target0.scrollHeight - target0.offsetHeight);
     target0.scrollTo(0, height);
 
-    timeout = setTimeout(function () {
+    timeout = setTimeout(() => {
       target.on("scroll", callback);
     }, 100);
   });
-
 });