我需要制作一个页面，随着时间的推移，每 5 秒更改一次时间，30 秒后我需要显示 30 秒已经过去的通知function showClock(){ var d=new Date(); var hours=d.getHours(); var minutes=d.getMinutes(); var seconds=d.getSeconds(); var clock=document.getElementById("clock"); clock.innerHTML=`<h1>${hours}:${minutes}:${seconds}</h1>`; } setInterval(showClock,1000);<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>Document</title></head><body> <section id="main"></section> <section id="clock"></section> </body></html>
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let start = (new Date()).getTime();
function showClock(){
var d = new Date();
var hours = d.getHours();
var minutes = d.getMinutes();
var seconds=d.getSeconds();
console.log(`${hours}:${minutes}:${seconds}`);
if(d.getTime() - start >= 1000 * 30) {
console.log('30 sec');
start = d.getTime();
}
}
setInterval(showClock, 5000);
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