老师帮忙检测下嘛谢谢

来源：4-9 编程练习

咸鱼王派大星

2021-03-31 15:33:46

<!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>
    <script>
        onload = function () {
            var inPut = document.getElementsByTagName('input')[0];
            inPut.onmousedown = function () {
                inPut.style.color = 'red';
            }
            inPut.onmouseup = function () {
                inPut.style.color = 'chartreuse';
            }
        }
    </script>
</head>
<body>
    <input type="button" value="点击改变按钮字体颜色" >

</body>
</html>