const myTimer = setInterval(function(){ // 每 1s 调用一次
  console.log('do once...')
}, 1000)

beforeDestroy(){
  clearInterval(myTimer) // 清除定时器 myTimer
}

//点击下载
   downloadInfo() {
     this.axiosFun() //axios请求
       .then(function (response) {
         var blob = new Blob([response], { type: "application/x-xls" }); //创建一个blob对象
         var a = document.createElement("a"); //创建一个<a></a>标签
         a.href = URL.createObjectURL(blob); // response is a blob
         var patt = new RegExp('filename=([^;]+\\.[^\\.;]+);*')
         var contentDisposition = decodeURL(res.headers['content-disposition'])
         var result = patt.exec(contentDisposition)
         var fileName = result[1]
         fileName = fileName.replace(/\"/g,'')
         a.download = fileName; //文件名称
         a.style.display = "none";
         document.body.appendChild(a);
         a.click();
         a.remove();
         // this.$refs.upload.clearFiles()
       })
       .catch(function (err) {
         console.log(err);
       });
   },