一般来说浏览器要同时下载几个文件,比如pdf文件,会在服务器端把几个文件压缩成一个文件。但是导致的问题就是会消耗服务器的cpu和io资源。
那有没有办法,用户点了几个文件,在客户端同时下载呢? 支持html5的浏览器是可以的,html的a标签有一个属性download
<a download="下载的1.pdf" href="1.pdf" rel="external nofollow" rel="external nofollow" >单个文件下载</a>, 经过测试在edge浏览器,firefox和chrome都支持。但是遗憾的是ie浏览器不支持。参考下面的例子。
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1"> <title></title> <script src="//libs.baidu.com/jquery/1.11.1/jquery.min.js"></script> </head> <body> <input type="button" class="downloadAll" value="批量下载" /> <script> var filesForDownload = []; filesForDownload[filesForDownload.length] = { path: "1.zip", //要下载的文件路径 name: "file1.txt" //下载后要显示的名称 }; filesForDownload[filesForDownload.length] = { path: "2.zip", name: "file2.txt" }; filesForDownload[filesForDownload.length] = { path: "3.zip", name: "file3.txt" }; function download(obj) { var temporaryDownloadLink = document.createElement("a"); temporaryDownloadLink.style.display = 'none'; document.body.appendChild( temporaryDownloadLink); temporaryDownloadLink.setAttribute( 'href', obj.path); temporaryDownloadLink.setAttribute( 'download', obj.name); temporaryDownloadLink.click(); document.body.removeChild( temporaryDownloadLink); } $('input.downloadAll').click(function( e) { e.preventDefault(); for (var x in filesForDownload) { download(filesForDownload[x]); } }); </script> </body> </html> ie浏览器怎么办呢? 也可以用window.open函数。 <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <script src="//libs.baidu.com/jquery/1.11.1/jquery.min.js"></script> </head> <body> <a download="下载的1.pdf" href="1.pdf" rel="external nofollow" rel="external nofollow" >单个文件下载</a> <br> <a href="#" rel="external nofollow" class="yourlink">下载全部文件</a> <script> $('a.yourlink').click(function(e) { e.preventDefault(); window.open('1.zip', 'download'); window.open('2.zip', 'download'); window.open('3.zip', 'download'); }); </script> </body> </html>
完整的方案就是根据浏览器类型,调用不同的函数,实现。
另外要下载pdf,而不是在浏览器中打开的话,需要配置apache的配置文件,在httpd.conf中增加下面的配置。
<FilesMatch "\.pdf$">
Header set Content-Disposition attachment
</FilesMatch>
或者使用down2组件,下载更简单。
JavaScript:
引入头
<head> <metahttp-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>donw2-多文件演示页面</title> <linktype="text/css" href="js/down.css" rel="external nofollow" rel="Stylesheet" /> <scripttype="text/javascript" src="js/jquery-1.4.min.js"> </script> <scripttype="text/javascript" src="js/down.app.js" charset="utf-8"> </script> <scripttype="text/javascript" src="js/down.edge.js" charset="utf-8"> </script> <scripttype="text/javascript" src="js/down.file.js" charset="utf-8"> </script> <scripttype="text/javascript" src="js/down.folder.js" charset="utf-8"> </script> <scripttype="text/javascript" src="js/down.js" charset="utf-8"> </script> </head>
创建down2对象
var downer = new DownloaderMgr(); downer.Config["Folder"] = ""; //设置默认下载路径。 //挂载事件 downer.event.taskCreate = function(obj) { $(document.body).append("文件ID:" + obj .fileSvr.id) + "<br/>"; }; downer.event.downProcess = function(obj) {}; downer.event.downStoped = function(obj) {}; downer.event.downComplete = function( obj) { $(document.body).append('<div>本地路径:' + obj.fileSvr.pathLoc + '</div>'); }; downer.event.downError = function(obj, err) {}; downer.event.queueComplete = function() { $(document.body).append( "<div>队列完成</div>"); };
批量下载url
$("#btn-down-files").click(function() { if (downer.Config["Folder"] == "") { downer.open_folder(); return; } var urls = [ { fileUrl: "http://res2.ncmem.com/res/images/ie11.png" } , { fileUrl: "http://res2.ncmem.com/res/images/up6.1/down.png" } , { fileUrl: "http://res2.ncmem.com/res/images/firefox.png" } , { fileUrl: "http://res2.ncmem.com/res/images/edge.png" } , { fileUrl: "http://res2.ncmem.com/res/images/up6.1/cloud.png" } , { fileUrl: "http://res2.ncmem.com/res/images/home/w.png" } , { fileUrl: "http://res2.ncmem.com/res/images/img.png" } ]; downer.app.addUrls(urls); });
当成一个文件夹下载
$("#btn-down-json").click(function() { if (downer.Config["Folder"] == "") { downer.open_folder(); return; } var fd = { nameLoc: "图片列表" , files: [ { fileUrl: "http://res2.ncmem.com/res/images/ie11.png" } , { fileUrl: "http://res2.ncmem.com/res/images/up6.1/down.png" } , { fileUrl: "http://res2.ncmem.com/res/images/firefox.png" } , { fileUrl: "http://res2.ncmem.com/res/images/edge.png" } , { fileUrl: "http://res2.ncmem.com/res/images/up6.1/cloud.png" } , { fileUrl: "http://res2.ncmem.com/res/images/home/w.png" } , { fileUrl: "http://res2.ncmem.com/res/images/img.png" } ] }; downer.app.addJson(fd); });
下载多级目录
$("#btn-down-fd").click(function() { if (downer.Config["Folder"] == "") { downer.open_folder(); return; } var fd = { nameLoc: "测试文件夹" , files: [ { fileUrl: "http://www.ncmem.com/images/ico-ftp.jpg" } , { fileUrl: "http://www.ncmem.com/images/ico-up.jpg" } ] , folders: [ { nameLoc: "图片1" , files: [ { fileUrl: "http://www.ncmem.com/images/ico-ftp.jpg" } , { fileUrl: "http://www.ncmem.com/images/ico-up.jpg" } , { fileUrl: "http://www.ncmem.com/images/ico-capture.jpg" } , { fileUrl: "http://www.ncmem.com/images/ico-imageuploader.gif" } , { fileUrl: "http://www.ncmem.com/images/ico-wordpaster.gif" } ] , folders: [ { nameLoc: "软件" , files: [ { fileUrl: "http://res2.ncmem.com/res/images/edit-file.png" } ] } ] } ] }; downer.app.addJson(fd); });
自定义下载文件名称
$("#btn-down-svr").click(function () { if (downer.Config["Folder"] == "") { downer.open_folder(); return; } var urls = [ { fileUrl: "http://localhost:90/db/down.aspx", nameLoc: "test.exe" } , { fileUrl: "http://localhost:90/db/down.aspx", nameLoc: "test-1.exe" } ]; downer.app.addUrls(urls); });
实现效果:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持站长技术。
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