在服务器中创建文件后，使用jQuery下载文件

我建议用隐藏的iframe代替ajax请求，然后当服务器返回上述文件时，它将自动要求用户下载它。

//name of iframevar strName = ("uploader" + (new Date()).getTime());// the iframevar jframe = $( "<iframe name="" + strName + "" src="about:blank" />" ).css( "display", "none" );jframe.load(function( objEvent ){         // at this point the user should have been asked to download a file.    // Remove the iframe from the document.    // Because FireFox has some issues with    // "Infinite thinking", let's put a small    // delay on the frame removal.    setTimeout(function(){        jframe.remove();    },100);});var form = $('<form>').attr( "action", "upload_act.cfm" )    .attr( "method", "post" )    .attr( "enctype", "multipart/form-data" )    .attr( "encoding", "multipart/form-data" )    .attr( "target", strName );form.append('<input type="hidden" name="somename">').val("someval");$( "body:first" ).append( jframe, form );

（以上代码原始改编自http://www.bennadel.com/blog/1244-ColdFusion-jQuery-And-AJAX-File-
Upload-Demo.htm
）

另一种选择是将其分为两个步骤。步骤1生成文件并返回url，步骤2用户单击下载（这将是指向该url的锚标记）。