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web-first
/
day01.html

<!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>Day-01</title>
    <style>
        p {
            margin: 0 auto;
            width: 200px;
        }
    </style>
</head>

<body>
    <button onclick="toRed()">红色</button>
    <button onclick="toNormal()">复原</button>
    <p>Hello World！</p>
    <script>
        function toRed() {
            document.querySelector('p').style.color = 'red';
        }

        function toNormal() {
            document.querySelector('p').style.color = '';
        }
    </script>
</body>

</html>