diff --git a/assets/scripts/editor.js b/assets/scripts/editor.js
index 468967c..7306c77 100644
--- a/assets/scripts/editor.js
+++ b/assets/scripts/editor.js
@@ -111,10 +111,11 @@ let app = new Vue({
     // 图片上传结束
     uploaded(response, file, fileList) {
       if (response.success) {
-        // 上传成功
+        // 上传成功，获取光标
         const cursor = this.editor.getCursor();
         const imageUrl = response.data.url
         const markdownImage = `![](${imageUrl})`
+        // 将 Markdown 形式的 URL 插入编辑框光标所在位置
         this.editor.replaceSelection(`\n${markdownImage}\n`, cursor);
         this.refresh();
 
diff --git a/index.html b/index.html
index e6e0042..a9ca8b4 100644
--- a/index.html
+++ b/index.html
@@ -34,9 +34,10 @@
   <div id="app" class="container">
     <el-container>
       <el-header class="top">
+        <!-- 图片上传 -->
         <el-upload action="https://cors-anywhere.herokuapp.com/https://sm.ms/api/v2/upload"
-          headers="{'Content-Type': 'multipart/form-data'}" :show-file-list="false" name="smfile" :on-success="uploaded"
-          :on-error="failed">
+          headers="{'Content-Type': 'multipart/form-data'}" :show-file-list="false" :multiple="false"
+          accept=".jpg,.jpeg,.png,.gif" :limit="1" name="smfile" :on-success="uploaded" :on-error="failed">
           <i class="el-icon-upload" size="medium">&nbsp;</i>
         </el-upload>
         <el-form size="mini" class="ctrl" :inline=true>