npm install js-file-download --save
npm install axios --save

import axios from "axios";

import fileDownload from "js-file-download";

export const exportExcel = (url:string, params:any) => {
    return axios({
        method: 'POST',
        url: url,
        data: params,
        responseType: 'arraybuffer',
        headers: {
            'Content-Type': 'application/json;charset=utf-8',
        }
    });
};

exportExcel(`导出的接口`,{
  {...导出的接口参数}
}).then((res:any) => {
  if(res.data.byteLength!==0){
    fileDownload(res.data,'文件.xls');
  }else{
    ElMessage({
      message: "无法找到对应的文件！！！",
      type: "warning",
    });
  }
});