Question

我想编写一个计算圆柱平方根的程序。当我在其他地方计算它时，结果太高了。

＆＃13;

<html>
<head>
<title>Example</title>
<script type="text/javascript">
function calculate(){
    var d = document.getElementById('d')
    var v = document.getElementById('v');
    var height = d.value;
    var diameter = v.value;
    var result = (Math.PI * (height * height) * (diameter / 100));
    console.log (result);
}
</script>
</head>
<body>
<h4>Height<h4>
<input id = 'd'></input>
<h4>Diameter<h4>
<input id = 'v'></input>
<button  onClick "calculate()" type = "submit">Calculate</button>
</body>
</html>

＆＃13;

Answer 1

更容易：

<html>
    <head>
    <title>Example</title>
    <script type="text/javascript">
    function calculate(){
        var d = document.getElementById('d').value,
            /* calc radius */
            r = (d / 2),
            /* calc area */
            A = (Math.PI * Math.pow(r, 2));
        console.log (A);
    }
    </script>
    </head>
    <body>
        <h4>Diameter<h4>
        <!-- input is selfclosing: -->
        <input id="d" />
        <!-- don’t forget the equal sign after onclick -->
        <button onclick="calculate()" type="button">Calculate</button>
    </body>
</html>

Javascript - 计算圆柱体的平方根

1 个答案: