本文實例講述了JavaScript實現控制打開文件另存為對話框的方法。分享給大家供大家參考。具體如下：
這里通過JS打開圖片另存為對話框，提示用戶保存文件
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><title> New Document </title><meta name="Generator" content="EditPlus"><meta name="Author" content=""><meta name="Keywords" content=""><meta name="Description" content=""><script src="js/jquery.min.js" type="text/javascript"></script><script language="JavaScript"><!--function downLoadImage(imagePathURL){//如果中間IFRAME不存在，則添加if(!document.getElementById("_SAVEASIMAGE_TEMP_FRAME"))jQuery('<iframe style="display:none;" id="_SAVEASIMAGE_TEMP_FRAME"name="_SAVEASIMAGE_TEMP_FRAME" onload="_doSaveAsImage();"width="0" height="0" src="about:blank"></iframe>').appendTo("body");if(document.all._SAVEASIMAGE_TEMP_FRAME.src!=imagePathURL){//圖片地址發生變化，加載圖片document.all._SAVEASIMAGE_TEMP_FRAME.src = imagePathURL;}else{//圖片地址沒有變化，直接另存為_doSaveAsImage();}}function _doSaveAsImage(){if(document.all._SAVEASIMAGE_TEMP_FRAME.src!="about:blank")document.frames("_SAVEASIMAGE_TEMP_FRAME").document.execCommand("SaveAs");}//--></script></head><body><input type="button" value="download image" onclick="downLoadImage('//www.survivalescaperooms.com/images/logo.gif');"></body></html>希望本文所述對大家的javascript程序設計有所幫助。
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