计算圆的面积

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2022-03-15

<!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>圆面积</title>

</head>

<body>

    <script>

        function ab() {

            var r = document.getElementById("a").value;

            var area = parseInt(3.14 * r * r);

            alert("半径为" + r + "的圆面积为:" + area);

        }

    </script>

    半径<input type="text" id="a">

    <button οnclick="ab()">提交</button>

</body>

</html>

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