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<head>
<meta charset=utf-8>
<title></title>
</head>
<body>
<h1>非平稳退化,如果浏览器禁用javascript,则会变得很糟糕</h1>
<a href="#" onclick="popUp('http://www.baidu.com');return false">Example1</a>
<h1>平稳退化Graceful degradation</h1>
<a href="http://www.baidu.com" onclick="popUp(this.href);return false">Example2</a>
<script>
function popUp(url){
window.open(url,"popUp","width=320,height=480");
}
</script>
</body>
</html>