feat:add richtext shortcut key

index.html

@@ -39,19 +39,19 @@
             </ul>
           </div>
         </div>
-        <div class="menu-item__size-add" title="增大字号">
+        <div class="menu-item__size-add" title="增大字号(Ctrl+[)">
           <i></i>
         </div>
-        <div class="menu-item__size-minus" title="减小字号">
+        <div class="menu-item__size-minus" title="减小字号(Ctrl+])">
           <i></i>
         </div>
-        <div class="menu-item__bold" title="加粗">
+        <div class="menu-item__bold" title="加粗(Ctrl+B)">
           <i></i>
         </div>
-        <div class="menu-item__italic" title="斜体">
+        <div class="menu-item__italic" title="斜体(Ctrl+I)">
           <i></i>
         </div>
-        <div class="menu-item__underline" title="下划线">
+        <div class="menu-item__underline" title="下划线(Ctrl+U)">
           <i></i>
         </div>
         <div class="menu-item__strikeout" title="删除线">
@@ -76,16 +76,16 @@
       </div>
       <div class="menu-divider"></div>
       <div class="menu-item">
-        <div class="menu-item__left" title="左对齐">
+        <div class="menu-item__left" title="左对齐(Ctrl+L)">
           <i></i>
         </div>
-        <div class="menu-item__center" title="居中对齐">
+        <div class="menu-item__center" title="居中对齐(Ctrl+E)">
           <i></i>
         </div>
-        <div class="menu-item__right" title="右对齐">
+        <div class="menu-item__right" title="右对齐(Ctrl+R)">
           <i></i>
         </div>
-        <div class="menu-item__alignment" title="两端对齐">
+        <div class="menu-item__alignment" title="两端对齐(Ctrl+J)">
           <i></i>
         </div>
         <div class="menu-item__row-margin">