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[JavaScript] js+下载文件夹

开发技术 开发技术 发布于:2021-07-08 16:45 | 阅读数:178 | 评论:0

  
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){
  
[*]
  <div hljs-ln-n"="" data-line-number="2">
  try {
  
[*]
  <div hljs-ln-n"="" data-line-number="3">
  var elemIF = document.createElement("iframe");
  
[*]
  <div hljs-ln-n"="" data-line-number="4">
  elemIF.src = url;
  
[*]
  <div hljs-ln-n"="" data-line-number="5">
  elemIF.style.display = "none";
  
[*]
  <div hljs-ln-n"="" data-line-number="6">
  document.body.appendChild(elemIF);
  
[*]
  <div hljs-ln-n"="" data-line-number="7">
  } catch (e) {
  
[*]
  <div hljs-ln-n"="" data-line-number="8">
  alert("下载异常!");
  
[*]
  <div hljs-ln-n"="" data-line-number="9">
  }
  
[*]
  <div hljs-ln-n"="" data-line-number="10">
  }
  
[/list]
  四、form表单的形式
[list=1]
[*]
  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}
  
[*]
  }
  
[/list]
  五、a标签的方式
[list=1]
[*]  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();
  
[*]
  }
  
[/list]
  六、假如后台给的文件流
[list=1]
[*]
  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);
  
[*]
  })
  
[*]
  };
  
[/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
  
[*]
  // 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() */
  
[*]
  }));
  
[/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
  
[*]
  xhr.onload = function () {
  
[*]
  // 返回200
  
[*]
  reader.readAsDataURL(blob); // 转换为base64,可以直接放入a表情href
  
[*]
  var a = document.createElement("a");
  
[*]
  $("body").append(a); // 修复firefox中无法触发click
  
[*]
  $(a).remove();
  
[*]
  };
  
[*]
  })
  
[*]
  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
  
[*]
  (function (root, factory) {
  
[*]
  define([], factory);
  
[*]
  // only CommonJS-like environments that support module.exports,
  
[*]
  } else {
  
[*]
  }
  
[*]
  return function download(data, strFileName, strMimeType) {
  
[*]
  defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads
  
[*]
  url = !strFileName && !strMimeType && payload,
  
[*]
  myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
  
[*]
  reader;
  
[*]
  if(String(this)==="true"){ //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
  
[*]
  payload=payload[1];
  
[*]
  
[*]
  anchor.href = url; // assign href prop to temp anchor
  
[*]
  
[*]
  ajax.responseType = 'blob';
  
[*]
  };
  
[*]
  } // end if valid url?
  
[*]
  
[*]
  
[*]
  mimeType=payload.type || defaultMime;
  
[*]
  navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
  
[*]
  
[*]
  blob = payload instanceof myBlob ?
  
[*]
  
[*]
  var parts= strUrl.split(/[:;,]/),
  
[*]
  binData= decoder( parts.pop() ),
  
[*]
  uiArr= new Uint8Array(mx);
  
[*]
  
[*]
  
[*]
  if ('download'in anchor) { //html5 A[download]
  
[*]
  anchor.className = "download-js-link";
  
[*]
  document.body.appendChild(anchor);
  
[*]
  document.body.removeChild(anchor);
  
[*]
  return true;
  
[*]
  // handle non-a[download] safari as best we can:
  
[*]
  if(!window.open(url)){ // popup blocked, offer direct download:
  
[*]
  return true;
  
[*]
  //do iframe dataURL download (old ch+FF):
  
[*]
  
[*]
  }
  
[*]
  
[*]
  
[*]
  if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
  
[*]
  
[*]
  }else{
  
[*]
  try{
  
[*]
  return saver( "data:" +  mimeType   + "," + encodeURIComponent(blob)  );
  
[*]
  
[*]
  reader.onload=function(e){
  
[*]
  reader.readAsDataURL(blob);
  
[*]
  }; /* end download() */
  
[*]
  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
[/list]
  
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