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<!DOCTYPE html> <html> <body> <h3>演示如何访问 EM 元素</h3> <p>点击按钮将<em id="myEm">强调文本</em>的颜色设置为红色。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myEm"); x.style.color = "red"; } </script> </body> </html>