大文件下载插件webupload插件

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/

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