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js文件下载替换文件名,vue下载文件替换文件名

程序员文章站 2022-03-07 21:36:31
下载文件方法1、window.open和window.location.hrefa,window.open()在下载文件的时候会打开一个新的页面,同时会暴露链接地址, 而且会在下载文件的过程中,访问链接2次,虽然前端只下载了一次文件,但是服务端会生成2次文件。b,对于rar.doc.等浏览器不能打开的文件,使用window.location.href是完全可以实现下载的。 示例: window.location.href="http://下载.rar" ,等同于

下载文件方法

1、window.open和window.location.href

a,window.open()在下载文件的时候会打开一个新的页面,同时会暴露链接地址, 而且会在下载文件的过程中,访问链接2次,虽然前端只下载了一次文件,但是服务端会生成2次文件。

b,对于rar.doc.等浏览器不能打开的文件,使用window.location.href是完全可以实现下载的。

  示例: window.location.href="http://下载.rar" ,等同于<a href="http://下载.rar">下载</a>

c,对于浏览器能打开得文件,例如html,xml,txt等,这样去写就不是下载,而是打开。我们想下载得话就得使用如下方法,

2.form表单

用动态生成的form元素,实现表单提交,并完成下载。注意此处不会ajax。原理仅仅是表单的提交。

由于jQery的ajax函数、及ajaxSubmit等函数的返回类型(dataType),只有xml、text、json、html等类型,没有’流’类型,故我们只要实现ajax下载时,不能够使用相应的ajax函数进行文件下载。

不过我们可以通过js生成一个form,用这个form提交参数,并返回“流”,类型数据。在实现过程中,页面也没有刷新

a标签(兼容性比较差,chrome没问题)

   <a href="#"></a>

或者

let ipUrl = 'http://' + this.user.ip + ':' + msgUrl;
let a = document.createElement('a');
    //
    a.setAttribute('download', '');
    a.href = ipUrl;
    a.click();
  document.body.removeChild(a); // 下载完成移除元素

iframe

如果是get方式的url下载链接,客户端可以通过一个动态生成的隐藏的iframe来得到下载的二进制文件。原理:iframe有一个src属性,其本质就是发送http请求,get页面或者数据。

down(){
     try{
              let iframeRequest = document.createElement('iframe');
              iframeRequest.id = "IFrameReauest";
              iframeRequest.src = ipUrl;
              iframeRequest.style.display = "none";
              document.body.appendChild(iframeRequest);
            }catch{
              console.log('下载异常');
            }

}

插件download.js(具体请看官网:http://danml.com/download.html)

安装

npm install downloadjs --save

引入
import download from ‘downloadjs’ 引入

最后通过download()方法使用
下载调用的方法download(data, strFileName, strMimeType)对应为:download(“数据”,“想要起的名称”,“Mime类型”),当不写后面的两个参数时,就可以下载指定文件了(不支持跨域),源码很简单就是没有后面的参数,就会通过ajax发送一个get请求,获取url的二进制流,然后把二进制流转化为对象就完成了下载工作。

这里传入文件名,即可修改下载的文件名
js文件下载替换文件名,vue下载文件替换文件名

插件源码

如果需要对文件进行其他限制,可以在文件限制

//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() */
}));

本文地址:https://blog.csdn.net/waillyer/article/details/109258811