<!DOCTYPE?html><html>?<head>??<title>瀏覽器對象</title>????<meta?http-equiv="Content-Type"?content="text/html;?charset=gkb"/>????</head>?<body>??<!--先編寫好網(wǎng)頁布局-->??<h1>操作成功</h1>??<span?id="one">5</span>??<span>秒后</span>??<a?href="javascript:sea()">返回</a>??<script?type="text/javascript">???function?daojishi()?{ var?sn=document.getElementById("one").innerHTML if(sn==0){ window.open("http://www.baidu.com") } ? setTimeout("daojishi()",1000); ? sn--; document.getElementById("one").innerText=sn;?}?function?sea()?{?window.history.back();?}???//獲取顯示秒數(shù)的元素，通過定時器來更改秒數(shù)。?????//通過window的location和history對象來控制網(wǎng)頁的跳轉。????</script>??<button?id="id1"?onclick="daojishi()">開始倒計時</button>?</body>
2020-01-19
聲明函數(shù)之后直接調用函數(shù)：
function?daojishi(){...} daojishi();