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<!DOCTYPE html> <html> <body> <h2>通过查询选择器查找 HTML 元素</h2> <p class="intro">Hello World!</p> <p class="intro">Hello Sweden!</p> <p class="intro">Hello Japan!</p> <p id="demo"></p> <script> var myElements = document.querySelectorAll("p.intro"); document.getElementById("demo").innerHTML = "第一段 class='intro' 是：" + myElements[0].innerHTML; </script> </body> </html>