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/
