第四次作业

这个作业属于哪个课程 https://edu.cnblogs.com/campus/sdscfz/SF4
这个作业要求在哪里 https://edu.cnblogs.com/campus/sdscfz/SF4/homework/12947
这个作业的目标 第四次作业

<!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>
        <p>圆的半径:<samp id="num1"></samp></p>
        <p>圆的周长:<samp id="sum"></samp></p>
        <p>圆的面积:<samp id="sum1"></samp></p>   
    </div>
    <script>
    var num1 = prompt("请输入圆的半径")
    if(!isNaN(num1)){
    var num2 = Math.PI
    var sum = parseFloat(num1)*num2*2
    var sum1 = parseFloat(num1)*parseFloat(num1)*num2
    console.log(sum.toFixed(2));
    console.log(sum1.toFixed(2));
    document.getElementById('num1').innerHTML =num1;
    document.getElementById('sum').innerHTML =sum.toFixed(2);
    document.getElementById('sum1').innerHTML =sum1.toFixed(2);
    }else{alert('请输入正确的值');}
    </script>
</body>
</html>

posted @ 2023-03-21 13:18  孙友训  阅读(17)  评论(0编辑  收藏  举报