js实现倒计时

function reloadPage(){

  var timer=10;

  var interval=setInterval(function(){

  $('#ishows').attr("style","display:block;");

  $('#ishows').text(timer+"s倒计时");

  timer-=1;

  if(timer==-1){

  clearInterval(interval)

  window.location.reload();

  }

  },1000);

  }