vue中后端返回文件流（ type “applicationoctet-stream“ ）前端下载对应的格式文件

开发中遇到了所以记录一下。。。。
不废话，我直接直接上代码吧
这里还解决了后端传的json格式，前端下载不了json的文件问题
1、定义一个方法downLoadFUnOne

downLoadFUnOne(data, fileName) {
var reader = new FileReader();
var bData = data;
reader.readAsText(bData, "utf-8");
reader.onload = function(e) {
try {
var msg = JSON.parse(reader.result);
if (msg && msg.resultCode == "401") {
clearLoginInfo();
console.log("401-->token");
window.location.href = window.SITE_CONFIG.nspmGxb;
}
if(bData.type == 'application/json'){
// 将对象转为json字符串
const jsonStr = JSON.stringify(msg)
// 创建一个文本文件Blob对象
const blob = new Blob([jsonStr], { type: 'application/json' })
// 构造下载链接
const url = URL.createObjectURL(blob)
// 创建下载链接的a标签
const a = document.createElement('a')
a.href = url
a.download = fileName
// 模拟点击下载链接
document.body.appendChild(a)
a.click()
document.body.removeChild(a)
// 释放Blob占用的资源
URL.revokeObjectURL(url)
}
} catch (err) {
let content = data;
if (window.navigator.msSaveBlob) {
window.navigator.msSaveBlob(content, fileName);
} else {
let elink = document.createElement("a");
elink.download = fileName;
elink.style.display = "none";
let blob = new Blob([content], {
type: "application/octet-stream"
});
elink.href = URL.createObjectURL(blob);
document.body.appendChild(elink);
elink.click();
document.body.removeChild(elink);
}
}
};
},

2、点击下载在调用上面的downLoadFUnOne方法

downLoadFun(row,index) {
this.activeIndex = index
this.$http({
url: this.$http.adornUrl(
`server-mgr/assetExport/downloadAssetFile/${row.id}`
),
method: "get",
responseType: "blob"
// data: this.$http.adornData(this.dataForm),
}).then(({ data }) => {
if(this.activeIndex == index){
this.downloadIcon = true
setTimeout(()=>{
this.downloadIcon = false
},3000)
}
this.downLoadFUnOne(data, row.fileName);
//   const contentDisposition = data.headers['content-disposition'];
//     const fileName = decodeURIComponent(contentDisposition.substring(contentDisposition.indexOf('=') + 1));
//     this.downLoadFUnOne(data.data,fileName)
});
},