怎样才能左键点击html后缀的链接也显示另存为的对话框?

大家都知道打开一个.html的文件和.zip的文件结果不同后者会显示另存为的对话框现在有
嗲方法让点html后缀的链接也显示另存为的对话框(不可用右键另存).
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 1<html>
 2<head>
 3<title>点击链接直接保存目标网页</title>
 4<meta content="EditPlus" name="Generator"/>
 5<meta content="JnKc" name="Author"/>
 6<meta content="" name="Keywords"/>
 7</head>
 8<body>
 9<a href="JavaScript:jnkcDownload('jnkc.htm')">下载网页</a>
10<iframe height="0" name="jnkcIframe" src="about:blank" style="display:none" width="0"></iframe>
11<script>   
12var jnkcUrl;   
13var jnkcWin;   
14var jnkcTimer;   
15function jnkcDownload(theUrl){   
16jnkcUrl = theUrl;   
17jnkcWin = window.open(jnkcUrl,'jnkcIframe');   
18jnkcTimer = setInterval('(jnkcWin.document.readyState!="complete")?"":jnkcSaveAs();',100);   
19}   
20function jnkcSaveAs(){   
21clearInterval(jnkcTimer);   
22jnkcWin.document.execCommand('SaveAs',false,jnkcUrl);   
23}   
24</script>
25</body>
26</html>
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