页面显示查询耗时

• 执行耗时接口，页面显示计时器

let tt = document.querySelector('.spanTimer') as HTMLElement;
let num = 0;
tt.innerText = num + '秒';
let min = '';
let sec = '';
let timeOut = setInterval(function () {//开启定时器
  num++;
  if (num <= 60) {
	tt.innerText = num + '秒';
  } else {
	min = (num / 60).toString().split('.')[0] + '分';
	sec = num % 60 + '秒';
	tt.innerText = min + sec;
  }
}, 1000);

//执行成功后清除
clearInterval(timeOut);