vue项目 下载表格 java后台返回的是信息流表格如何下载解决乱码？

主要是在请求参数后面加上{responseType: 'blob'}或者arrayBuffer

this.$http.get(this.api.export, {
    params: this.info,
    // responseType: 'blob'
    responseType: 'arraybuffer'
}).then(res => {
    loading.close();
    // 第一种
    // let blob = new Blob([res.data], {type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"});
    // let objectUrl = URL.createObjectURL(blob);
    // window.location.href = objectUrl;
    // 第二种
    let fileName = res.headers['content-disposition'].split("=")[1].split(";")[0];
    let objectUrl = URL.createObjectURL(new Blob([res.data]));
    const link = document.createElement('a');
    link.download = decodeURIComponent(fileName);
    link.href = objectUrl;
    link.click();
})

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1.有时候,前端页面上需要展示后台接口返回给我们的一个二进制文件,比如图片,那么我们应该如何下载呢

js中有个Blob对象,一个 Blob对象表示一个不可变的, 原始数据的类似文件对象。Blob表示的数据不一定是一个JavaScript原生格式 blob对象本质上是js中的一个对象，里面可以储存大量的二进制编码格式的数据。

2.创建Blob 对象

var debug = {hello: "world"};

var blob = new Blob(['后台返回的二进制文件'],{type : '该文件是什么类型的文件(MIME)'});

3.常用的文件类型有(MIME),根据需要返回怎样的文件,就填写怎样的MIME类型,也可以不写,写的话指定了下载的文件格式,不写,文件是什么格式,下载就是什么格式,根据项目需求.

后缀名 MIME名称

*.3gpp audio/3gpp, video/3gpp

*.ac3 audio/ac3

*.asf allpication/vnd.ms-asf

*.au audio/basic

*.css text/css

*.csv text/csv

*.doc application/msword

*.dot application/msword

*.dtd application/xml-dtd

*.dwg image/vnd.dwg

*.dxf image/vnd.dxf

*.gif image/gif

*.htm text/html

*.html text/html

*.jp2 image/jp2

*.jpe image/jpeg

*.jpeg image/jpeg

*.jpg image/jpeg

*.js text/javascript, application/javascript

*.json application/json

*.mp2 audio/mpeg, video/mpeg

*.mp3 audio/mpeg

*.mp4 audio/mp4, video/mp4

*.mpeg video/mpeg

*.mpg video/mpeg

*.mpp application/vnd.ms-project

*.ogg application/ogg, audio/ogg

*.pdf application/pdf

*.png image/png

*.pot application/vnd.ms-powerpoint

*.pps application/vnd.ms-powerpoint

*.ppt application/vnd.ms-powerpoint

*.rtf application/rtf, text/rtf

*.svf image/vnd.svf

*.tif image/tiff

*.tiff image/tiff

*.txt text/plain

*.wdb application/vnd.ms-works

*.wps application/vnd.ms-works

*.xhtml application/xhtml+xml

*.xlc application/vnd.ms-excel

*.xlm application/vnd.ms-excel

*.xls application/vnd.ms-excel

*.xlt application/vnd.ms-excel

*.xlw application/vnd.ms-excel

*.xml text/xml, application/xml

*.zip aplication/zip

*.xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet