前端实现base64格式文件的下载

利用Blob对象进行文件的下载
例子（此例子是在vue中执行的，其他环境需注意方法的调用）：
base64格式文件

let docbase64 = 'data:application/octet-stream;base64,0M8R4KGxGuEgCAIAAAAAAMAAAAAAAABGPgADAP7/CQAGAAAAAAAAAAAAAAABAAAAJQAAAAAAAAAAEAAAJAAAAAEAAAD+AAAAACcAAAD///8JCBAAAAYFALsNzQfBgAEABgYAAOEAAgCwBMEAAgAAAOIAAABcAHAABgABaAB1AGoAaQBuAGcAICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIEIAAgCwBGEBAgAAAMABAAA9AQYAAQACAAMAGQACAAAAEgACAAAAEwACAAAArwECAAAAvAECAAAAPQASAAAAAACcbbQtOAAAAAAAAQBYAkAAAgAAAI0AAgAAACIAAgAAAA4AAgABALcBAgAAANoAAgAAADEAFADwAAAA/3+QAQAAAACGAAIBi1tTTzEAFAAAAAAA/3+QAQAAAACGAAIBi1tTTzEAFAAAAAAA/3+QAQAAAACGAAIBi1tTTzEAFAAAAAAA/3+QAQAAAACGAAIBi1tTTzEAFADcAAAACACQAQAAAACGAAIBSXu/fjEAHgBoAQAACACQAQAAAACGAAcBuWVjaw9cB2iLW4B7U08xABQA8AAAAAgAkAEAAAADhgACAdGeU08xABQA8AAAAP9/kAEAAAADhgACAdGeU08xABQA8AAAAAgAkAEAAAADhgACAdGeU08xABQA3AAAAAkAkAEAAAAAhgACAYtbU08xABQA3AAAADUAkAEAAAAAhgACAYtbU08xABQA3AAAAAgAkAEAAAAAhgACAYtbU08xABQA3AAAAAoAkAEAAAAAhgACAYtbU08xABQAaAEAADYAvAIAAAAAhgACAYtbU08xABQA3AAAAAwAkAEAAAEAhgACAYtbU08xABQA3AAAADYAvAIAAAAAhgACAYtbU08xABQA3AACABcAkAEAAAAAhgACAYtbU08xABQALAEAADYAvAIAAAAAhgACAYtbU08xABQA3AAAAD8AvAIAAAAAhgACAYtbU08xABQA3AAAAAkAvAIAAAAAhgACAYtbU08xABQA3AAAAAgAvAIAAAAAhgACAYtbU08xABQA3AAAABEAkAEAAAAAhgACAYtbU08xABQABAEAADYAvAIAAAAAhgACAYtbU08xABQA3AAAABMAkAEAAAAAhgACAYtbU08xABQA3AAAADUAvAIAAAAAhgACAYtbU08xABQA3AAAAD4AkAEAAAAAhgACAYtbU08xABQA3AAAABAAkAEAAAAAhgACAYtbU08xABQA3AAAABQAkAEAAAEAhgACAYtbU08xABQA3AAAAAgAkAEAAAAAhgACAYtbU08eBCsABQATAAEiAOX/IgAjACwAIwAjADAAOwAiAOX/IgBcAC0AIwAsACMAIwAwAB4ENQAGABgAASIA5f8iACMALAAjACMAMAA7AFsAUgBlAGQAXQAiAOX/IgBcAC0AIwAsACMAIwAwAB4ENwAHABkAASIA5f8iACMALAAjACMAMAAuADAAMAA7ACIA5f8iAFwALQAjACwAIwAjADAALgAwADAAHgRBAAgAHgABIgDl/yIAIwAsACMAIwAwAC4AMAAwADsAWwBSAGUAZABdACIA5f8iAFwALQAjACwAIwAjADAALgAwADAAHgRpACoAMgABXwAgACIA5f8iACoAIAAjACwAIwAjADAAXwAgADsAXwAgACIA5f8iACoAIABcAC0AIwAsACMAIwAwAF8AIAA7AF8AIAAiAOX/IgAqACAAIgAtACIAXwAgADsAXwAgAEAAXwAgAB4EVwApACkAAV8AIAAqACAAIwAsACMAIwAwAF8AIAA7AF8AIAAqACAAXAAtACMALAAjACMAMABfACAAOwBfACAAKgAgACIALQAiAF8AIAA7AF8AIABAAF8AIAAeBHkALAA6AAFfACAAIgDl/yIAKgAgACMALAAjACMAMAAuADAAMABfACAAOwBfACAAIgDl/yIAKgAgAFwALQAjACwAIwAjADAALgAwADAAXwAgADsAXwAgACIA5f8iACoAIAAiAC0AIgA/AD8AXwAgADsAXwAgAEAAXwAgAB4EZwArADEAAV8AIAAqACAAIwAsACMAIwAwAC4AMAAwAF8AIAA7AF8AIAAqACAAXAAtACMALAAjACMAMAAuADAAMABfACAAOwBfACAAKgAgACIALQAiAD8APwBfACAAOwBfACAAQABfACAAHgQvABcAFQABXAAkACMALAAjACMAMABfACkAOwBcACgAXAAkACMALAAjACMAMABcACkAHgQ5ABgAGgABXAAkACMALAAjACMAMABfACkAOwBbAFIAZQBkAF0AXAAoAFwAJAAjACwAIwAjADAAXAApAB4EOwAZABsAAVwAJAAjACwAIwAjADAALgAwADAAXwApADsAXAAoAFwAJAAjACwAIwAjADAALgAwADAAXAApAB4ERQAaACAAAVwAJAAjACwAIwAjADAALgAwADAAXwApADsAWwBSAGUAZABdAFwAKABcACQAIwAsACMAIwAwAC4AMAAwAFwAKQDgABQAAAAAAPX/EAAAAAAAAAAAAAAAwCDgABQAAQAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAQAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAgAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAgAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAPX/EAAA9AAAAAAAAAAAwCDgABQAAAAAAAEAEAAAAAAAAAAAAAAAwCDgABQACgAAAPX/EAAAtAAAQCBAIAAEFiDgABQADAAAAPX/EAAAtAAAQCBAIAAEGiDgABQACgAAAPX/EAAAtAAAQCBAIAAEMyDgABQAGgAAAPX/EAAAlBERlwuXCwAELyDgABQADAAAAPX/EAAAtAAAQCBAIAAEFiDgABQADAAAAPX/EAAAtAAAQCBAIAAECSDgABQAAAAsAPX/EAAA+AAAAAAAAAAAwCDgABQACgAAAPX/EAAAtAAAQCBAIAAENyDgABQAAAAJAPX/EAAA+AAAAAAAAAAAwCDgABQACgAAAPX/EAAAtAAAQCBAIAAELyDgABQACgAAAPX/EAAAtAAAQCBAIAAEGCDgABQACgAAAPX/EAAAtAAAQCBAIAAENSDgABQACgAAAPX/EAAAtAAAQCBAIAAELCDgABQACgAAAPX/EAAAtAAAQCBAIAAELyDgABQAGQAAAPX/EAAAlBERlwuXCwAECSDgABQACgAAAPX/EAAAtAAAQCBAIAAEMCDgABQAGAAAAPX/EAAAtAAAQCBAIAAEKyDgABQADAAAAPX/EAAAtAAAQCBAIAAEHyDgABQAFgAAAPX/EAAAtAAAQCBAIAAEKiDgABQADAAAAPX/EAAAtAAAQCBAIAAEGyDgABQAFQAAAPX/EAAA1ABhQCAwGAAAwCDgABQAGwAAAPX/EAAAtAAAQCBAIAAELSDgABQAFAAAAPX/EAAAlGZmvx+/HwAENyDgABQAEwAAAPX/EAAAlBERvx+/HwAECSDgABQAEgAAAPX/EAAA1AAgQCBAGAAAwCDgABQAEQAAAPX/EAAA9AAAQCBAIAAAwCDgABQADAAAAPX/EAAAtAAAQCBAIAAEGiDgABQAEAAAAPX/EAAA9AAAQCBAIAAAwCDgABQAAAAqAPX/EAAA+AAAAAAAAAAAwCDgABQADAAAAPX/EAAAtAAAQCBAIAAEKyDgABQAAAArAPX/EAAA+AAAAAAAAAAAwCDgABQAHAAAAPX/EAAA9AAAQCBAIAAAwCDgABQADgAAAPX/EAAA9AAAQCBAIAAAwCDgABQADAAAAPX/EAAAtAAAQCBAIAAELyDgABQADQAAAPX/EAAA9AAAQCBAIAAAwCDgABQACgAAAPX/EAAAtAAAQCBAIAAEFiDgABQAHQAAAPX/EAAAnBERFgsWCwAEGiDgABQADAAAAPX/EAAAtAAAQCBAIAAEKiDgABQACgAAAPX/EAAAtAAAQCBAIAAENiDgABQADAAAAPX/EAAAtAAAQCBAIAAEFiDgABQADwAAAPX/EAAA9AAAQCBAIAAAwCDgABQAAAApAPX/EAAA+AAAAAAAAAAAwCDgABQAFwAAAPX/EAAA1AAgQCBAGAAAwCDgABQADAAAAPX/EAAAtAAAQCBAIAAEHyDgABQAEAAAAPX/EAAA1AAgQCBAFgAAwCDgABQACgAAAPX/EAAAtAAAQCBAIAAEOSDgABQADAAAAPX/EAAAtAAAQCBAIAAEHyDgABQACwAAAPX/EAAA1ABgQCBAGgAAwCDgABQABQAAAAEAEgAAWAAAAAAAAAAGCSDgABQABgAxAAEAEgAAPAEACSBAIAAAwCDgABQABgAxAAEAEgAAPAAAQCBAIAAAwCDgABQABwAxAAEAGgAAfBERCAQIBAAGCSDgABQACAAxAAEAGgAAfBERCAQIBAAGCSDgABQACQAxAAEAGgAAfBERCAQIBAAGCSDgABQABgAxAAEAEgAAPBAAwARAIAAAwCDgABQABwAxAAEAGgAAfAERCCAIBAAGCSDgABQABwAxAAEAGgAAfBERQCBAIAAGCSDgABQABw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html：

<div id="result"></div>

执行：

let erjinzhi = this.createFile(docbase64);
this.Blob_down(erjinzhi);

用到的js方法：

//base64转换二进制
createFile(urlData){
    let data = urlData.split(',')[1]
    var bytes=window.atob(data),
    // var bytes=window.atob(urlData),//如果是不带前缀的base64则直接执行此行代码即可
        n=bytes.length,
        u8arr=new Uint8Array(n);
    while(n--){
        u8arr[n]=bytes.charCodeAt(n);
    }
    return u8arr
},
//转为blob对象并添加下载链接
Blob_down(erjinzhi){
    let text = erjinzhi;
    let blob;
    let result = document.getElementById("result");
    console.log(window.Blob)
    if(!window.Blob)
        result.innerHTML = '不支持';
    else
        blob = new Blob([text]);
    if(window.URL){
    
    	//最好自定义文件名且带上后缀，这样下载的文件比较好找且加上文件后缀不用选择打开的工具即可走默认的打开文件的软件
        result.innerHTML = '<a download=' + 'name.xls' + ' href="' + window.URL.createObjectURL(blob) + '" target="_blank">文件下载</a>';

    }
    //var read=new FileReader();
    //创建读取器对象FileReader
	// read.readAsText(blob);  
	// read.οnlοad=function () {//数据读完会触发onload事件
	//     console.log(read.result);//read有个result属性存放这结果，从result获取到数据
//     result.innerHTML = read.result
// }
},

原文链接：https://blog.csdn.net/zuoyiran520081/article/details/106851502