第四次作业
这个作业属于哪个课程 | https://edu.cnblogs.com/campus/sdscfz/SF4 |
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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>