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JS 参考手册
HTML DOM Underline 对象
tryjsref_u_get
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<!DOCTYPE html> <html> <body> <h3>A demonstration of how to access a U element</h3> <p>Click the button to set the color of <u id="myU">this underlined text</u> to red.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementById("myU"); x.style.color = "red"; } </script> </body> </html>