<button type="button" onclick="file_new()">新建</button>
<button type="button" onclick="file_open()">打开</button>
<button type="button" onclick="file_save()">保存</button>
<button type="button" onclick="edit_cut()">剪切</button>
<button type="button" onclick="edit_copy()">复制</button>
<button type="button" onclick="edit_paste()">粘贴</button>
<p><b>注释：</b>所有主流浏览器均不支持 menu 元素。</p>