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:[list=1]
[*] <div hljs-ln-n"="" data-line-number="1">
function(url){
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<div hljs-ln-n"="" data-line-number="2">
try {
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<div hljs-ln-n"="" data-line-number="3">
var elemIF = document.createElement("iframe");
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<div hljs-ln-n"="" data-line-number="4">
elemIF.src = url;
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<div hljs-ln-n"="" data-line-number="5">
elemIF.style.display = "none";
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<div hljs-ln-n"="" data-line-number="6">
document.body.appendChild(elemIF);
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<div hljs-ln-n"="" data-line-number="7">
} catch (e) {
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<div hljs-ln-n"="" data-line-number="8">
alert("下载异常!");
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<div hljs-ln-n"="" data-line-number="9">
}
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<div hljs-ln-n"="" data-line-number="10">
}
[/list] 四、form表单的形式
[list=1]
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downloadFile(url){
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var form=$("<form>");
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form.attr("style","display:none");
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form.attr("target","");
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form.attr("method","get");
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form.attr("action",url);
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$("body").append(form);
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form.submit();//表单提交}
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}
[/list] 五、a标签的方式[list=1]
[*] function(url,name){
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var a = document.createElement("a");
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a.download = name + ".xls";
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a.href = url;
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$("body").append(a); // 修复firefox中无法触发click
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a.click();
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$(a).remove();
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}
[/list] 六、假如后台给的文件流
[list=1]
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function (formData, url, name) {
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return new Promise((resolve, reject) => {
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var xhr = new XMLHttpRequest();
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xhr.open("POST", url, true); // 也可以使用POST方式,根据接口
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xhr.responseType = "blob"; // 返回类型blob
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// 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
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xhr.onload = function () {
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// 请求完成
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if (this.status === 200) {
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// 返回200
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var blob = this.response;
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var reader = new FileReader();
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reader.readAsDataURL(blob); // 转换为base64,可以直接放入a表情href
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reader.onload = function (e) {
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// 转换完成,创建一个a标签用于下载
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var a = document.createElement("a");
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a.download = name + ".xls";
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a.href = e.target.result;
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$("body").append(a); // 修复firefox中无法触发click
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a.click();
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resolve(200)
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$(a).remove();
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};
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}
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};
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// 发送ajax请求
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xhr.send(formData);
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})
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};
[/list] 七、download.js
我粘贴一下download的源码[list=1]
[*] //download.js v4.2, by dandavis; 2008-2016. [CCBY2] see http://danml.com/download.html for tests/usage
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// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime
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// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs
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// 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.
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// v4 adds AMD/UMD, commonJS, and plain browser support
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// v4.1 adds url download capability via solo URL argument (same domain/CORS only)
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// v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors
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// https://github.com/rndme/download
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[*]
(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module.
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define([], factory);
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} else if (typeof exports === 'object') {
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// Node. Does not work with strict CommonJS, but
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// only CommonJS-like environments that support module.exports,
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// like Node.
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module.exports = factory();
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} else {
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// Browser globals (root is window)
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root.download = factory();
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}
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}(this, function () {
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return function download(data, strFileName, strMimeType) {
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var self = window, // this script is only for browsers anyway...
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defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
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mimeType = strMimeType || defaultMime,
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payload = data,
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url = !strFileName && !strMimeType && payload,
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anchor = document.createElement("a"),
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toString = function(a){return String(a);},
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myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
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fileName = strFileName || "download",
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blob,
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reader;
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myBlob= myBlob.call ? myBlob.bind(self) : Blob ;
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if(String(this)==="true"){ //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
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payload=[payload, mimeType];
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mimeType=payload[0];
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payload=payload[1];
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}
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if(url && url.length< 2048){ // if no filename and no mime, assume a url was passed as the only argument
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fileName = url.split("/").pop().split("?")[0];
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anchor.href = url; // assign href prop to temp anchor
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if(anchor.href.indexOf(url) !== -1){ // if the browser determines that it's a potentially valid url path:
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var ajax=new XMLHttpRequest();
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ajax.open( "GET", url, true);
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ajax.responseType = 'blob';
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ajax.onload= function(e){
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download(e.target.response, fileName, defaultMime);
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};
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setTimeout(function(){ ajax.send();}, 0); // allows setting custom ajax headers using the return:
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return ajax;
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} // end if valid url?
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} // end if url?
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//go ahead and download dataURLs right away
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if(/^data\:[\w+\-]+\/[\w+\-]+[,;]/.test(payload)){
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if(payload.length > (1024*1024*1.999) && myBlob !== toString ){
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payload=dataUrlToBlob(payload);
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mimeType=payload.type || defaultMime;
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}else{
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return navigator.msSaveBlob ? // IE10 can't do a[download], only Blobs:
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navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
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saver(payload) ; // everyone else can save dataURLs un-processed
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}
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}//end if dataURL passed?
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blob = payload instanceof myBlob ?
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payload :
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new myBlob([payload], {type: mimeType}) ;
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function dataUrlToBlob(strUrl) {
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var parts= strUrl.split(/[:;,]/),
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type= parts[1],
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decoder= parts[2] == "base64" ? atob : decodeURIComponent,
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binData= decoder( parts.pop() ),
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mx= binData.length,
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i= 0,
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uiArr= new Uint8Array(mx);
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for(i;i<mx;++i) uiArr[i]= binData.charCodeAt(i);
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return new myBlob([uiArr], {type: type});
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}
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function saver(url, winMode){
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if ('download' in anchor) { //html5 A[download]
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anchor.href = url;
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anchor.setAttribute("download", fileName);
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anchor.className = "download-js-link";
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anchor.innerHTML = "downloading...";
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anchor.style.display = "none";
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document.body.appendChild(anchor);
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setTimeout(function() {
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anchor.click();
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document.body.removeChild(anchor);
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if(winMode===true){setTimeout(function(){ self.URL.revokeObjectURL(anchor.href);}, 250 );}
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}, 66);
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return true;
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}
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// handle non-a[download] safari as best we can:
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if(/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
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url=url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
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if(!window.open(url)){ // popup blocked, offer direct download:
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if(confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")){ location.href=url; }
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}
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return true;
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}
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//do iframe dataURL download (old ch+FF):
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var f = document.createElement("iframe");
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document.body.appendChild(f);
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if(!winMode){ // force a mime that will download:
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url="data:"+url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
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}
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f.src=url;
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setTimeout(function(){ document.body.removeChild(f); }, 333);
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}//end saver
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if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
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return navigator.msSaveBlob(blob, fileName);
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}
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if(self.URL){ // simple fast and modern way using Blob and URL:
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saver(self.URL.createObjectURL(blob), true);
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}else{
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// handle non-Blob()+non-URL browsers:
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if(typeof blob === "string" || blob.constructor===toString ){
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try{
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return saver( "data:" + mimeType + ";base64," + self.btoa(blob) );
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}catch(y){
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return saver( "data:" + mimeType + "," + encodeURIComponent(blob) );
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}
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}
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// Blob but not URL support:
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reader=new FileReader();
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reader.onload=function(e){
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saver(this.result);
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};
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reader.readAsDataURL(blob);
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}
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return true;
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}; /* end download() */
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}));
[/list] 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/ [list]
[*] xhr.open("POST", url, true); // 也可以使用POST方式,根据接口
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xhr.onload = function () {
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// 返回200
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reader.readAsDataURL(blob); // 转换为base64,可以直接放入a表情href
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var a = document.createElement("a");
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$("body").append(a); // 修复firefox中无法触发click
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$(a).remove();
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};
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})
[*]
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
[*]
// 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.
[*]
// v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors
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(function (root, factory) {
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define([], factory);
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// only CommonJS-like environments that support module.exports,
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} else {
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}
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return function download(data, strFileName, strMimeType) {
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defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
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url = !strFileName && !strMimeType && payload,
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myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
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reader;
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if(String(this)==="true"){ //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
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payload=payload[1];
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anchor.href = url; // assign href prop to temp anchor
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ajax.responseType = 'blob';
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};
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} // end if valid url?
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mimeType=payload.type || defaultMime;
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navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
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blob = payload instanceof myBlob ?
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var parts= strUrl.split(/[:;,]/),
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binData= decoder( parts.pop() ),
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uiArr= new Uint8Array(mx);
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if ('download'in anchor) { //html5 A[download]
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anchor.className = "download-js-link";
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document.body.appendChild(anchor);
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document.body.removeChild(anchor);
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return true;
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// handle non-a[download] safari as best we can:
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if(!window.open(url)){ // popup blocked, offer direct download:
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return true;
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//do iframe dataURL download (old ch+FF):
[*]
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}
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if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
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}else{
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try{
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return saver( "data:" + mimeType + "," + encodeURIComponent(blob) );
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reader.onload=function(e){
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reader.readAsDataURL(blob);
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}; /* end download() */
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用法: 注意 download.js第一个参数 是数据流,不是像oss那样的文件地址
[b]详细的配置信息可以参考我写的这篇文章:[/b]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(1481) 评论(0) 编辑 收藏 举报
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