js自动下载文件到本地的实现代码

<html> 
<head> 
<title>js自动下载文件到本地</title> 
<script language="javascript" type="text/javascript"> 
function InitAjax() 
{ 
var ajax; 
if(window.ActiveXObject){ 
var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP']; 
for(var i=0; i <versions.length; i++) { 
try { 
ajax = new ActiveXObject(versions[i]); 
if(ajax) { 
return ajax; 
} 
} catch(e) {} 

} 
}else if(window.XMLHttpRequest) 
{ 
ajax = new XMLHttpRequest(); 
} 

return ajax; 
} 
//js自动下载文件到本地 
var xh; 
function getXML(geturl) { 
alert(geturl); 
xh = InitAjax(); 
xh.onreadystatechange = getReady; 
xh.open("GET", geturl, true); 
xh.send(); 
} 

function getReady() { 

//alert(xh.readyState); 
if (xh.readyState == 4) { 
alert(xh.status); 
if (xh.status == 200) { 
saveFile("d:\dd.gif"); 
return true; 
} 
else 
{ return false; } 
} 
else 
return false; 
} 

function saveFile(tofile) { 
alert(tofile); 
var objStream; 
var imgs; 
imgs = xh.responseBody; 
objStream = new ActiveXObject("ADODB.Stream"); 
objStream.Type = 1; 
objStream.open(); 
objStream.write(imgs); 
objStream.SaveToFile(tofile) 
} 
//getXML("http://10.76.3.116/2.bmp"); 
//js自动下载文件到本地结束 
</script> 

</head> 
<body> 
<form id="form1" runat="server"> 
<div> 
<input type="button" value="124" onclick="getXML('http://img.jb51.net/images/dl.gif')"> 
</div> 
</form> 
</body> 
</html>
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发布时间 2013-04-28 01:38:33