4-9作业

来源：4-9 编程练习

知还

2022-03-24 09:03:12

<!DOCTYPE html>
<html>

<head lang="en">
    <meta charset="UTF-8">
    <title>onload</title>
    <script type="text/javascript">
	    //补充代码
        window.onload = function() {
            var btn = document.getElementById('btn');
            btn.onclick = function() {
                btn.style.color = 'red';
            }
            btn.onmouseleave = function() {
                btn.style.color = 'gray';
            }
        }

    </script>
</head>

<body>
    <input type="button" value="点击改变按钮字体颜色" id="btn">
</body>

</html>