运行 ❯
获取您
自己的
网站
×
更改方向
保存代码
更改主题，深色/浅色
前往 Spaces
<!DOCTYPE html> <html> <style> div { border: 1px solid black; padding: 16px; } </style> <body> <h1>The Element Object</h1> <h2>The getElementsByClassName() Method</h2> <div id="myDIV"> <p class="child">I am a paragraph.</p> <p class="child">I am a paragraph.</p> <p class="child">I am a paragraph.</p> </div> <p>Click "Change" to change the size of the second paragraph with class="child":</p> <button onclick="myFunction()">Change</button> <script> function myFunction() { const element = document.getElementById("myDIV"); element.getElementsByClassName("child")[1].style.fontSize = "24px"; } </script> </body> </html>
