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<!DOCTYPE html> <html> <body> <p><a id="myAnchor" href="https://www.begtut.com/">BEGTUT</a></p> <p>点击按钮，将上面链接的id属性值改为“newid”。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myAnchor").id = "newid"; document.getElementById("demo").innerHTML = "链接的 ID 从'myAnchor'更改为'newid'。"; } </script> </body> </html>