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<!DOCTYPE html> <html> <body> <h2>通过查询选择器查找 HTML 元素</h2> <p>Hello World!</p> <p class="intro">DOM 非常有用。</p> <p class="intro">此示例演示了 <b>querySelectorAll</b> 方法。</p> <p id="demo"></p> <script> var x = document.querySelectorAll("p.intro"); document.getElementById("demo").innerHTML = '第一段（索引为 0）带有 class="intro"：' + x[0].innerHTML; </script> </body> </html>