javascript与xmlhttp联合实现文件下载

<script language="javascript">var xh;function getXML(geturl){xh = new ActiveXObject("Microsoft.XMLHTTP"); xh.onreadystatechange = getReady; xh.open("GET",geturl,true);                     xh.send();                             }

function getReady(){alert(xh.readyState);if(xh.readyState==4){if(xh.status==200) {saveFile("d:/rss.xml");return true;} else{return false;}}elsereturn false;}

function saveFile(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://yoyokee.com/demo/rss.xml');</script>