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<!DOCTYPE html> <html> <head> <style> .anchors { display: block; padding: 5px; background-color: black; color: white; } #myAnchor { background-color: dodgerblue; } </style> </head> <body> <a class="anchors" id="myAnchor" href="https://www.begtut.com/html/">HTML</a> <a class="anchors" href="https://www.begtut.com/css/">CSS</a> <a class="anchors" href="https://www.begtut.com/js/">JavaScript</a> <p>点击按钮显示上面第一个链接的id属性值。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByClassName("anchors")[0].id; document.getElementById("demo").innerHTML = x; } </script> </body> </html>