tryjsref_onshow_dom 在线代码实例

实例代码( Tip: 登录后体验更佳 )
运行代码

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
<style>
div {
    background: yellow;
    border: 1px solid #cccccc;
    padding: 10px;
}
</style>
</head>
<body>
<p>该实例演示了如何使用 HTML DOM 向 menu 元素中添加 "onshow" 事件。</p>
<div contextmenu="mymenu">
<p>用鼠标右键单击黄色框区域查看上下文菜单！</p>
<menu type="context" id="mymenu">
  <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><strong>注意：</strong>目前只有 Firefox 浏览器支持  onshow 属性。</p>
<script>
document.getElementById("mymenu").onshow = function() {myFunction()};
function myFunction() {
     alert("上下文菜单即将显示");
}
</script>
</body>
</html>
 
 
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运行结果
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