1<body>
2 <p>Il est <span id="time"></span>.</p>
3 <button id="stop">Stop time</button>
4<script>
5 let hour = document.getElementById("time");
6 let stop = document.getElementById("stop");
7 let realTime = setInterval(clock, 1000);
8
9 function clock(){
10 let d = new Date();
11 hour.innerHTML = d.toLocaleTimeString();
12 }
13 stop.addEventListener ("click", arret);
14 function arret() {
15 clearInterval(realTime);
16 }
17</script>
18</body>