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test15.html

<!DOCTYPE html>
<html>
    <head>
        <title>15Javascript HTML DOM 改变CSS</title>
        <meta charset="UTf-8">
    </head>
    <body>
        <h1>15Javascript HTML DOM 改变CSS</h1>
        <p id = "p1">你好，世界</p>
        <p id = "p2">你好，世界</p>
        <script>
        document.getElementById("p2").style.color = "blue";
        document.getElementById("p2").style.fontFamily = "仿宋";
        document.getElementById("p2").style.fontSize = "larger";
        </script>
        <!--点击按钮改变颜色-->
        <h1 id = "h1">效果示例标题</h1>
        <button type = "button" onclick = "document.getElementById('h1').style.color = 'red'">点击按钮改变颜色</button>
        <!--测试显示与隐藏-->
        <p id = "p3">这是一段用于测试显示与隐藏文本的内容</p>
        <input type = "button" value="隐藏文本" onclick="document.getElementById('p3').style.visibility = 'hidden'"/>
        <input type = "button" value="显示文本" onclick="document.getElementById('p3').style.visibility = 'visible'"/>
    </body>
</html>