<!DOCTYPE html>
<html>
<head>
<style>
div {
background: yellow;
border: 1px solid #cccccc;
padding: 10px;
}
</style>
</head>
<body>
<p>本例演示如何将 "onshow" 事件分配给 menu 元素。</p>
<div contextmenu="mymenu">
<p>在此框中右键单击以查看上下文菜单！
<menu type="context" id="mymenu" onshow="myFunction()">
<menuitem label="Refresh" onclick="window.location.reload();" icon="ico_reload.png"></menuitem>
<menu label="Share on...">
<menuitem label="Twitter" icon="ico_twitter.png" onclick="window.open('//twitter.com/intent/tweet?text=' + window.location.href);"></menuitem>
<menuitem label="Facebook" icon="ico_facebook.png" onclick="window.open('//facebook.com/sharer/sharer.php?u=' + window.location.href);"></menuitem>
</menu>
<menuitem label="Email This Page" onclick="window.location='mailto:?body='+window.location.href;"></menuitem>
</menu>
</div>
<p><b>注释：</b>onshow 事件目前仅在 Firefox 中受支持。</p>
<script>
function myFunction() {
alert("The context menu is about to be shown");
}
</script>
</body>
</html>
