需求：
页面每隔1s输出当前时间
输出当前时间可以使用：new Date().toLocaleString()
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div></div>
<script>
function getTime(){
document.querySelector('div').innerHTML=new Date().toLocaleString()
setTimeout(getTime,1000)
}
getTime()
</script>
</body>
</html>代码很简单，主要强调递归的思想