diff --git a/src/common/course/ActionBtn.js b/src/common/course/ActionBtn.js
index c2e0ea01..c8596656 100644
--- a/src/common/course/ActionBtn.js
+++ b/src/common/course/ActionBtn.js
@@ -6,22 +6,18 @@ const map = {
   'colorBlue': 'colorBlue',   // 蓝字白底
 }
 class ActionBtn extends Component {
-  constructor(props) {
-    super(props);
-  }
-
   render() {
     let { to, children, style, className, ...others } = this.props
     return (
       <React.Fragment>
         {
-          to == undefined ?
+          to === undefined ?
             <a onClick={this.props.onClick}
               {...others}
-              className={"Actionbtn " + `${map[style || 'blue']} ${this.props.className}`}
+              className={`Actionbtn ${map[style || 'blue']} ${this.props.className}`}
             >{children}</a>
             :
-            <Link to={to} className={"btn " + `${map[this.props.style]} ${this.props.className}`} {...others}>{this.props.children}</Link>
+            <Link to={to} className={`btn ${map[this.props.style]} ${this.props.className}`} {...others}>{this.props.children}</Link>
         }
       </React.Fragment>
     )
diff --git a/src/components/render-html.jsx b/src/components/render-html.jsx
index 5f3594ab..0620be18 100644
--- a/src/components/render-html.jsx
+++ b/src/components/render-html.jsx
@@ -5,12 +5,13 @@ import { exportMdtoHtml } from 'educoder'
 let preRegex = /<pre[^>]*>/g
 export default ({ value = '', is_md = true, className, style = {} }) => {
   let html = is_md ? exportMdtoHtml(value) : value
-  html = html.replace(/▁/g, "▁▁▁").replace('<p>[TOC]</p>', '')
+  console.log(html, '----========')
+  html = html.replace(/▁/g, "▁▁▁")
   const el = useRef()
 
   useEffect(() => {
     if (el.current && html) {
-      if (preRegex.test(html)) {
+      if (html.match(preRegex)) {
         window.PR.prettyPrint()
       }
     }
diff --git a/src/modules/moop_cases/CaseDetail.js b/src/modules/moop_cases/CaseDetail.js
index badecad1..7ec4ba49 100644
--- a/src/modules/moop_cases/CaseDetail.js
+++ b/src/modules/moop_cases/CaseDetail.js
@@ -112,7 +112,7 @@ class CaseDetail extends Component {
                       }
 
                       {
-                        operation && operation.can_editable ? <ActionBtn style="colorBlue" to={`/moop_cases/${this.props.match.params.caseID}/edit`} className="fr mr20">编辑</ActionBtn> : ""
+                        operation && operation.can_editable ? <ActionBtn style=" colorBlue" to={`/moop_cases/${this.props.match.params.caseID}/edit`} className="fr mr20">编辑</ActionBtn> : ""
                       }
                     </li>
                     <li className="clearfix lineh-20">