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<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; } </style> </head> <body> <div id="myDIV"> <h2 class="example">div 中带有 class="example" 的标题</h2> <p class="example">div 中带有 class="example" 的段落。</p> <p class="example">在div中还有一个class="example"的段落。</p> </div> <p>点击按钮更改div中第一个class为“example”的p元素的文本。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myDIV"); x.querySelector("p.example").innerHTML = "Hello World!"; } </script> </body> </html>