JS下载文件,解决文件直接在浏览器打开的情况:
function downloadfile(url, file_name) { var xmlHttp = null; if (window.ActiveXObject) { // IE6, IE5 浏览器执行代码 xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } else if (window.XMLHttpRequest) { // IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码 xmlHttp = new XMLHttpRequest(); } //2.如果实例化成功,就调用open()方法: if (xmlHttp != null) { xmlHttp.open("get", url, true); xmlHttp.send(); xmlHttp.onreadystatechange = doResult; //设置回调函数 } function doResult() { if (xmlHttp.readyState == 4) { //4表示执行完成 if (xmlHttp.status == 200) { //200表示执行成功 //引用js库:download.js download(xmlHttp.responseText, file_name, "text/plain"); } } } }
download.js:
//download.js v3.0, by dandavis; 2008-2014. [CCBY2] see http://danml.com/download.html for tests/usage // v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime // v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs // v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support // data can be a string, Blob, File, or dataURL function download(data, strFileName, strMimeType) { var self = window, // this script is only for browsers anyway... u = "application/octet-stream", // this default mime also triggers iframe downloads m = strMimeType || u, x = data, D = document, a = D.createElement("a"), z = function(a){return String(a);}, B = self.Blob || self.MozBlob || self.WebKitBlob || z, BB = self.MSBlobBuilder || self.WebKitBlobBuilder || self.BlobBuilder, fn = strFileName || "download", blob, b, ua, fr; //if(typeof B.bind === \'function\' ){ B=B.bind(self); } if(String(this)==="true"){ //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback x=[x, m]; m=x[0]; x=x[1]; } //go ahead and download dataURLs right away if(String(x).match(/^data\:[\w+\-]+\/[\w+\-]+[,;]/)){ return navigator.msSaveBlob ? // IE10 can\'t do a[download], only Blobs: navigator.msSaveBlob(d2b(x), fn) : saver(x) ; // everyone else can save dataURLs un-processed }//end if dataURL passed? try{ blob = x instanceof B ? x : new B([x], {type: m}) ; }catch(y){ if(BB){ b = new BB(); b.append([x]); blob = b.getBlob(m); // the blob } } function d2b(u) { var p= u.split(/[:;,]/), t= p[1], dec= p[2] == "base64" ? atob : decodeURIComponent, bin= dec(p.pop()), mx= bin.length, i= 0, uia= new Uint8Array(mx); for(i;i<mx;++i) uia[i]= bin.charCodeAt(i); return new B([uia], {type: t}); } function saver(url, winMode){ if (\'download\' in a) { //html5 A[download] a.href = url; a.setAttribute("download", fn); a.innerHTML = "downloading..."; D.body.appendChild(a); setTimeout(function() { a.click(); D.body.removeChild(a); if(winMode===true){setTimeout(function(){ self.URL.revokeObjectURL(a.href);}, 250 );} }, 66); return true; } //do iframe dataURL download (old ch+FF): var f = D.createElement("iframe"); D.body.appendChild(f); if(!winMode){ // force a mime that will download: url="data:"+url.replace(/^data:([\w\/\-\+]+)/, u); } f.src = url; setTimeout(function(){ D.body.removeChild(f); }, 333); }//end saver if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL) return navigator.msSaveBlob(blob, fn); } if(self.URL){ // simple fast and modern way using Blob and URL: saver(self.URL.createObjectURL(blob), true); }else{ // handle non-Blob()+non-URL browsers: if(typeof blob === "string" || blob.constructor===z ){ try{ return saver( "data:" + m + ";base64," + self.btoa(blob) ); }catch(y){ return saver( "data:" + m + "," + encodeURIComponent(blob) ); } } // Blob but not URL: fr=new FileReader(); fr.onload=function(e){ saver(this.result); }; fr.readAsDataURL(blob); } return true; } /* end download() */