<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Did u made it ?</title>
</head>
<body>
<script type="text/javascript">
var score = +prompt("请输入你的成绩：");
if(score >= 0 && score <= 100)
{
switch(score >= 60)
{
case true:
alert("恭喜你，及格了！" + score + " 分");
document.write("恭喜你，及格了！" + score + " 分");
break;
case false:
alert("很遗憾，不及格。" + score + " 分");
document.write("很遗憾，不及格。" + score + " 分");
break;
}
}
else
{
alert("请输入合法分数！");
document.write("请输入合法分数！");
}
</script>
</body>
</html>- 老师的写法：
switch(parseInt(score/10))
{
case 10:
case 9:
case 8:
case 7:
case 6:
alert("恭喜你，及格了！" + score + " 分");
document.write("恭喜你，及格了！" + score + " 分");
break;
default:
alert("很遗憾，不及格。" + score + " 分");
document.write("很遗憾，不及格。" + score + " 分");
break;
} switch(true)
{
case score >= 60:
alert("恭喜你，及格了！" + score + " 分");
document.write("恭喜你，及格了！" + score + " 分");
break;
default:
alert("很遗憾，不及格。" + score + " 分");
document.write("很遗憾，不及格。" + score + " 分");
break;
}