setInterval倒计时10s

if (condition == 1) {
var ii = 10;
alert_s("尊敬的用户:", "您好，我们已对该项目进行了服务升级，<span id='count_down'>10</span>s后自动跳转。");
var cd = setInterval(function(){
   ii--;
   $("#count_down").html(ii);
   if (ii == 0) {
       clearInterval(cd);
       window.location="https://www.baidu.com";
   }
}, 1000);
}

alert_s为自定义弹框

condition为满足的条件