![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>document</title>
<script type="text/javascript">
var fen = prompt("请输入分数");
fen = parseFloat(fen);
if(fen >= 90 && fen <= 100)
{
alert("A级")
}else if(fen >=70 && fen < 90)
{
alert("B级")
}else if(fen >=60 && fen <70)
{
alert("C级")
}else if(fen < 60)
{
alert("不及格")
}else
{
alert("输入有误")
}
</script>
</head>
<body>
</body>
</html>点击 "运行实例" 按钮查看在线实例