diff --git a/src/muya/lib/contentState/paragraphCtrl.js b/src/muya/lib/contentState/paragraphCtrl.js
index cfb32c5f..38bdcb7e 100644
--- a/src/muya/lib/contentState/paragraphCtrl.js
+++ b/src/muya/lib/contentState/paragraphCtrl.js
@@ -157,7 +157,11 @@ const paragraphCtrl = ContentState => {
           setTimeout(() => {
             this.updateTaskListItem(listItemParagraph, listType)
             this.partialRender()
+            this.muya.dispatchSelectionChange()
+            this.muya.dispatchSelectionFormats()
+            this.muya.dispatchChange()
           })
+          return false
         } else {
           this.updateList(paragraph, listType, undefined, block)
         }
@@ -189,6 +193,8 @@ const paragraphCtrl = ContentState => {
         })
       }
     }
+
+    return true
   }
 
   ContentState.prototype.handleLooseListItem = function () {
@@ -447,6 +453,7 @@ const paragraphCtrl = ContentState => {
     const { start, end } = this.cursor
     const block = this.getBlock(start.key)
     const { text } = block
+    let needDispatchChange = true
 
     switch (paraType) {
       case 'front-matter': {
@@ -456,7 +463,7 @@ const paragraphCtrl = ContentState => {
       case 'ul-bullet':
       case 'ul-task':
       case 'ol-order': {
-        this.handleListMenu(paraType, insertMode)
+        needDispatchChange = this.handleListMenu(paraType, insertMode)
         break
       }
       case 'loose-list-item': {
@@ -601,9 +608,11 @@ const paragraphCtrl = ContentState => {
       this.partialRender()
     }
 
-    this.muya.dispatchSelectionChange()
-    this.muya.dispatchSelectionFormats()
-    this.muya.dispatchChange()
+    if (needDispatchChange) {
+      this.muya.dispatchSelectionChange()
+      this.muya.dispatchSelectionFormats()
+      this.muya.dispatchChange()
+    }
   }
 
   ContentState.prototype.insertParagraph = function (location, text = '', outMost = false) {
diff --git a/src/muya/lib/index.js b/src/muya/lib/index.js
index 3bc2225b..dac37aa7 100644
--- a/src/muya/lib/index.js
+++ b/src/muya/lib/index.js
@@ -139,9 +139,9 @@ class Muya {
     return this.contentState.history.clearHistory()
   }
 
-  exportStyledHTML (title = '', printOptimization = false) {
+  exportStyledHTML (title = '', printOptimization = false, extraCss = '') {
     const { markdown } = this
-    return new ExportHtml(markdown, this).generate(title, printOptimization)
+    return new ExportHtml(markdown, this).generate(title, printOptimization, extraCss)
   }
 
   exportHtml () {
diff --git a/src/muya/lib/utils/exportMarkdown.js b/src/muya/lib/utils/exportMarkdown.js
index 88cb291a..da279acc 100644
--- a/src/muya/lib/utils/exportMarkdown.js
+++ b/src/muya/lib/utils/exportMarkdown.js
@@ -258,7 +258,7 @@ class ExportMarkdown {
     const tHeader = table.children[0]
     const tBody = table.children[1]
     const escapeText = str => {
-      return str.replace(/(?<!\\)\|/g, '\\|')
+      return str.replace(/([^\\])\|/g, '$1\\|')
     }
 
     tableData.push(tHeader.children[0].children.map(th => escapeText(th.text).trim()))