js实现oss批量下载文件_js下载文件到本地各种方法总结

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.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 = newXMLHttpRequest();

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 = newFileReader();

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 functiondownload(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){returnString(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=newXMLHttpRequest();

ajax.open("GET", url, true);

ajax.responseType= 'blob';

ajax.οnlοad= function(e){

download(e.target.response, fileName, defaultMime);

};

setTimeout(function(){ ajax.send();}, 0); //allows setting custom ajax headers using the return:

returnajax;

}//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 :newmyBlob([payload], {type: mimeType}) ;functiondataUrlToBlob(strUrl) {var parts= strUrl.split(/[:;,]/),

type= parts[1],

decoder= parts[2] == "base64" ?atob : decodeURIComponent,

binData=decoder( parts.pop() ),

mx=binData.length,

i= 0,

uiArr= newUint8Array(mx);for(i;i

}functionsaver(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)

returnnavigator.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=newFileReader();

reader.οnlοad=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

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原文链接：https://blog.csdn.net/wodebokecsdn/java/article/details/88397665