<html>
<body>
<p>单击这个按钮可根据日期显示消息。</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
var text;
switch (new Date().getDay()) {
case 1:
case 2:
case 3:
default:
text = "Looking forward to the Weekend";
break;
case 4:
case 5:
text = "Soon it is Weekend";
break;
case 0:
case 6:
text = "It is Weekend";
}
document.getElementById("demo").innerHTML = text;
}
</script>
</body>
</html>