<!DOCTYPE html>
<html>
<head>
<title>链接和超链接</title>
</head>
<body>
<a href="">链接--当前页面打开--相当于</a>
<br>
<a href="" target="_blank">超链接--新窗口打开---相当于</a>
<br>
<button >按钮</button>
<script type="text/javascript">
var btn = ('btn')
= function () {
(111)
// = '' //当前页面打开
('') //新窗口打开
}
</script>
</body>
</html>