<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>遞歸實現倒計時</title>
</head>
<body>
<a href=# οnclick="GetTime()">倒計時</a>
<script>
let time;
function GetTime() {
time = window.prompt("請輸入一個時間:","5");
digui();
}
function digui() {
let flag = setTimeout(digui,1000)
document.body.innerHTML= time;
time--;
if (time==-1)
return clearTimeout(flag)
return digui;
}
</script>
</body>
</html>
