显示当前时间( setInterval() 方法会每秒执行一次函数，类似手表功能)
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>雅爱笔记_www.5devip.com</title>
</head>
<body>
<p>显示当前时间:</p>
<p id="shijian"></p>
<script>
var myVar = setInterval(function(){ myTimer() }, 1000);
function myTimer() {
var d = new Date();
var t = d.toLocaleTimeString();
document.getElementById("shijian").innerHTML = t;
}
</script>
</body>
</html>