tryjsref_ononline_addeventlistener 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>
</head>
<body>
<p>该实例演示了如何使用 addEventListener() 方法向 body 元素添加 "ononline" 和 "onoffline" 事件。</p>
<p>打开文件菜单点击 "离线工作（Work Offline）" 来切换在线与离线模式。</p>
<p><strong>注意：</strong>  ononline 和 onoffline 事件只有 Firefox 和 Internet Explorer  8  到 10 版本的浏览器支持。</p>
<script>
window.addEventListener("online", onFunction);
window.addEventListener("offline", offFunction);
function onFunction() {
    alert ("你的浏览器在线工作。");
}
function offFunction() {
    alert ("你的浏览器离线工作。 ");
}
</script>
</body>
</html>
 
 
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运行结果
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