关键点：
1.blob的type设置成表格
var blob = new Blob([res.data],{type : 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'});
2.请求header里面设置：responseType:'blob'
//此处用到了插件useAwait，和自己的接口请求函数download，慎重复制
async fillDownload(item) {
//console.log(item, "item");
let params = {
deptCode: sessionStorage.getItem('deptId'),
listStatus: 5,
requireNo:item.requireNo,
tableSeq: item.tableSeq,
};
let [err, res] = await useAwait(download(params));
if (err) return;
// console.log(res,'res')
let blob = new Blob([res.data],{type : 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'});
console.log(blob, "blob");
// FileReader主要用于将文件内容读入内存
let reader = new FileReader();
reader.readAsDataURL(blob);
// onload当读取操作成功完成时调用
reader.onload =function(e){
let a = document.createElement("a");
// 获取文件名fileName
let fileName = res.headers["content-disposition"].split("=");
console.log(fileName,'fileName')
fileName = fileName[1];
fileName = fileName.replace(/"/g, "");
a.download = fileName;
a.href = e.target.result;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
};
},
内容不乱码，在axios中加 responseType:'blob'(此处为自己封装的axios，请勿复制)
export function download(params) {//下载填报数据
return api({
method: 'post',
url: appServer.integratingInformation + 'excel/download',
data:params,
responseType:'blob'
})
}
