js+下载文件夹
一、此方法火狐有些版本是不支持的
window.location.href = 'https://*****.oss-cn-**.aliyuncs.com/*********';
二、为了解决火狐有些版本不支持,可以改成这种方式
window.location='https://*****.oss-cn-**.aliyuncs.com/*********';
三、该方法IE和火狐都可以,url表示要下载的文件路径:
- function(url){
- try {
- var elemIF = document.createElement("iframe");
- elemIF.src = url;
- elemIF.style.display = "none";
- document.body.appendChild(elemIF);
- } catch (e) {
- alert("下载异常!");
- }
- }
四、form表单的形式
- downloadFile(url){
- var form=$("<form>");
- form.attr("style","display:none");
- form.attr("target","");
- form.attr("method","get");
- form.attr("action",url);
- $("body").append(form);
- form.submit();//表单提交}
- }
五、a标签的方式
- function(url,name){
- var a = document.createElement("a");
- a.download = name + ".xls";
- a.href = url;
- $("body").append(a); // 修复firefox中无法触发click
- a.click();
- $(a).remove();
- }
六、假如后台给的文件流
- function (formData, url, name) {
- return new Promise((resolve, reject) => {
- var xhr = new XMLHttpRequest();
- xhr.open("POST", url, true); // 也可以使用POST方式,根据接口
- xhr.responseType = "blob"; // 返回类型blob
- // 定义请求完成的处理函数,请求前也可以增加加载框/禁用下载按钮逻辑
- xhr.onload = function () {
- // 请求完成
- if (this.status === 200) {
- // 返回200
- var blob = this.response;
- var reader = new FileReader();
- reader.readAsDataURL(blob); // 转换为base64,可以直接放入a表情href
- reader.onload = function (e) {
- // 转换完成,创建一个a标签用于下载
- var a = document.createElement("a");
- a.download = name + ".xls";
- a.href = e.target.result;
- $("body").append(a); // 修复firefox中无法触发click
- a.click();
- resolve(200)
- $(a).remove();
- };
- }
- };
- // 发送ajax请求
- xhr.send(formData);
- })
- };
七、download.js
我粘贴一下download的源码
- //download.js v4.2, by dandavis; 2008-2016. [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. 3.1 improved safari handling.
- // v4 adds AMD/UMD, commonJS, and plain browser support
- // v4.1 adds url download capability via solo URL argument (same domain/CORS only)
- // v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors
- // https://github.com/rndme/download
-
- (function (root, factory) {
- if (typeof define === 'function' && define.amd) {
- // AMD. Register as an anonymous module.
- define([], factory);
- } else if (typeof exports === 'object') {
- // Node. Does not work with strict CommonJS, but
- // only CommonJS-like environments that support module.exports,
- // like Node.
- module.exports = factory();
- } else {
- // Browser globals (root is window)
- root.download = factory();
- }
- }(this, function () {
-
- return function download(data, strFileName, strMimeType) {
-
- var self = window, // this script is only for browsers anyway...
- defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
- mimeType = strMimeType || defaultMime,
- payload = data,
- url = !strFileName && !strMimeType && payload,
- anchor = document.createElement("a"),
- toString = function(a){return String(a);},
- myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
- fileName = strFileName || "download",
- blob,
- reader;
- myBlob= myBlob.call ? myBlob.bind(self) : Blob ;
-
- if(String(this)==="true"){ //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
- payload=[payload, mimeType];
- mimeType=payload[0];
- payload=payload[1];
- }
-
-
- if(url && url.length< 2048){ // if no filename and no mime, assume a url was passed as the only argument
- fileName = url.split("/").pop().split("?")[0];
- anchor.href = url; // assign href prop to temp anchor
- if(anchor.href.indexOf(url) !== -1){ // if the browser determines that it's a potentially valid url path:
- var ajax=new XMLHttpRequest();
- ajax.open( "GET", url, true);
- ajax.responseType = 'blob';
- ajax.onload= function(e){
- download(e.target.response, fileName, defaultMime);
- };
- setTimeout(function(){ ajax.send();}, 0); // allows setting custom ajax headers using the return:
- return ajax;
- } // end if valid url?
- } // end if url?
-
-
- //go ahead and download dataURLs right away
- if(/^data\:[\w+\-]+\/[\w+\-]+[,;]/.test(payload)){
-
- if(payload.length > (1024*1024*1.999) && myBlob !== toString ){
- payload=dataUrlToBlob(payload);
- mimeType=payload.type || defaultMime;
- }else{
- return navigator.msSaveBlob ? // IE10 can't do a[download], only Blobs:
- navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
- saver(payload) ; // everyone else can save dataURLs un-processed
- }
-
- }//end if dataURL passed?
-
- blob = payload instanceof myBlob ?
- payload :
- new myBlob([payload], {type: mimeType}) ;
-
-
- function dataUrlToBlob(strUrl) {
- var parts= strUrl.split(/[:;,]/),
- type= parts[1],
- decoder= parts[2] == "base64" ? atob : decodeURIComponent,
- binData= decoder( parts.pop() ),
- mx= binData.length,
- i= 0,
- uiArr= new Uint8Array(mx);
-
- for(i;i<mx;++i) uiArr[i]= binData.charCodeAt(i);
-
- return new myBlob([uiArr], {type: type});
- }
-
- function saver(url, winMode){
-
- if ('download' in anchor) { //html5 A[download]
- anchor.href = url;
- anchor.setAttribute("download", fileName);
- anchor.className = "download-js-link";
- anchor.innerHTML = "downloading...";
- anchor.style.display = "none";
- document.body.appendChild(anchor);
- setTimeout(function() {
- anchor.click();
- document.body.removeChild(anchor);
- if(winMode===true){setTimeout(function(){ self.URL.revokeObjectURL(anchor.href);}, 250 );}
- }, 66);
- return true;
- }
-
- // handle non-a[download] safari as best we can:
- if(/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
- url=url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
- if(!window.open(url)){ // popup blocked, offer direct download:
- if(confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")){ location.href=url; }
- }
- return true;
- }
-
- //do iframe dataURL download (old ch+FF):
- var f = document.createElement("iframe");
- document.body.appendChild(f);
-
- if(!winMode){ // force a mime that will download:
- url="data:"+url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
- }
- f.src=url;
- setTimeout(function(){ document.body.removeChild(f); }, 333);
-
- }//end saver
-
-
-
-
- if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
- return navigator.msSaveBlob(blob, fileName);
- }
-
- 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===toString ){
- try{
- return saver( "data:" + mimeType + ";base64," + self.btoa(blob) );
- }catch(y){
- return saver( "data:" + mimeType + "," + encodeURIComponent(blob) );
- }
- }
-
- // Blob but not URL support:
- reader=new FileReader();
- reader.onload=function(e){
- saver(this.result);
- };
- reader.readAsDataURL(blob);
- }
- return true;
- }; /* end download() */
- }));
用法:
download(fileUrl,name,"video/mp4");
具体更多的用法请参考官网,
注意 download.js第一个参数 是数据流,不是像oss那样的文件地址
详细的配置信息可以参考我写的这篇文章:http://blog.ncmem.com/wordpress/2019/08/28/java%e6%89%b9%e9%87%8f%e4%b8%8b%e8%bd%bd/
posted on 2019-08-06 09:24 Xproer-松鼠 阅读(2108) 评论(0) 编辑 收藏 举报