diff --git a/public/react/src/App.js b/public/react/src/App.js
index 7fc302e9f..512f60e21 100644
--- a/public/react/src/App.js
+++ b/public/react/src/App.js
@@ -439,7 +439,7 @@ class App extends Component {
 
 		window.addEventListener('error', (event) => {
 			const msg = `${event.type}: ${event.message}`;
-			console.log(msg)
+			// console.log(msg)
 		});
 	}
 	//修改登录方法
diff --git a/public/react/src/common/TextUtil.js b/public/react/src/common/TextUtil.js
index 4c445dcbf..8360881e9 100644
--- a/public/react/src/common/TextUtil.js
+++ b/public/react/src/common/TextUtil.js
@@ -6,39 +6,44 @@ export function isImageExtension(fileName) {
 }
 
 export function markdownToHTML(oldContent, selector) {
-    window.$('#md_div').html('')
-    // markdown to html
-    if (selector && oldContent && oldContent.startsWith('<p')) {  // 普通html处理
-        window.$('#' + selector).addClass('renderAsHtml')
-        window.$('#' + selector).html(oldContent)
-    } else {
-        try {    
-        $("#"+selector).html('')
-            // selector || 
-        var markdwonParser = window.editormd.markdownToHTML(selector || "md_div", {
-            markdown: oldContent, // .replace(/▁/g,"▁▁▁"),
-            emoji: true,
-            htmlDecode: "style,script,iframe",  // you can filter tags decode
-            taskList: true,
-            tex: true,  // 默认不解析
-            flowChart: true,  // 默认不解析
-            sequenceDiagram: true // 默认不解析
-        });
+    console.log(oldContent)
+    console.log(selector)
+    if(oldContent){
+        window.$('#md_div').html('')
+        // markdown to html
+        if (selector && oldContent && oldContent.startsWith('<p')) {  // 普通html处理
+            window.$('#' + selector).addClass('renderAsHtml')
+            window.$('#' + selector).html(oldContent)
+        } else {
+            try {
+                $("#"+selector).html('')
+                // selector ||
+                var markdwonParser = window.editormd.markdownToHTML(selector || "md_div", {
+                    markdown: oldContent, // .replace(/▁/g,"▁▁▁"),
+                    emoji: true,
+                    htmlDecode: "style,script,iframe",  // you can filter tags decode
+                    taskList: true,
+                    tex: true,  // 默认不解析
+                    flowChart: true,  // 默认不解析
+                    sequenceDiagram: true // 默认不解析
+                });
 
-        } catch(e) {
-            console.error(e)
-        }
-        // selector = '.' + selector
-        if (selector) {
-            return;
-        }
-        
-        const content = window.$('#md_div').html()
-        if (selector) {
-            window.$(selector).html(content)
+            } catch(e) {
+                console.error(e)
+            }
+            // selector = '.' + selector
+            if (selector) {
+                return;
+            }
+
+            const content = window.$('#md_div').html()
+            if (selector) {
+                window.$(selector).html(content)
+            }
+            return content
         }
-        return content
     }
+
 }
 function _doDownload(options) {
     $.fileDownload(getUrl() + "/api" + options.url, {
@@ -57,7 +62,7 @@ export function downloadFile(options) {
             _doDownload(options)
         });
     }
-        
+
 }
 
 export function appendFileSizeToUploadFile(item) {
@@ -67,13 +72,13 @@ export function appendFileSizeToUploadFileAll(fileList) {
     return fileList.map(item => {
         if (item.name.indexOf(uploadNameSizeSeperator) == -1) {
           return Object.assign({}, item, {name: `${item.name}${uploadNameSizeSeperator}${bytesToSize(item.size)}`})
-        } 
+        }
         return item
-    }) 
+    })
 }
 export const uploadNameSizeSeperator = '　　'
 
-export const sortDirections = ["ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", 
-      "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", 
-      "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", 
+export const sortDirections = ["ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend",
+      "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend",
+      "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend",
       "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", "ascend", "descend", ]
\ No newline at end of file
diff --git a/public/react/src/modules/courses/exercise/new/ShixunProgramming.js b/public/react/src/modules/courses/exercise/new/ShixunProgramming.js
index 80c966267..dbc9b6a6a 100644
--- a/public/react/src/modules/courses/exercise/new/ShixunProgramming.js
+++ b/public/react/src/modules/courses/exercise/new/ShixunProgramming.js
@@ -43,7 +43,7 @@ class ShixunProgramming extends Component{
                                 >实训详情</a>
                               }
         ></QestionDisplayHeader>
- 
+
         {description&&
         !this.props.exercise||this.props.exercise&&this.props.exercise.is_md?<MarkdownToHtml content={description} selector={'qtitle_' + (index + 1)} style={{ display: 'inline-block', width:'100%' , margin: '10px 0px 15px' }}