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<!DOCTYPE html> <html> <head> <style> #myDIV { text-decoration: underline; } </style> </head> <body> <h1>使用 JavaScript 更改文本装饰颜色</h1> <div id="myDIV"> Hello world! </div> <p>单击“试一试”按钮更改下划线的颜色。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { document.getElementById("myDIV").style.textDecorationColor = "red"; } </script> <p><strong>注意：</strong> 79 之前的 Edge 不支持 textDecorationColor 属性。</p> </body> </html>