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JS 参考手册
HTML DOM Underline 对象
tryjsref_u_create
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<!DOCTYPE html> <html> <body> <p>Click the button to create a U element with some text.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.createElement("U"); var t = document.createTextNode("This text is underlined"); x.appendChild(t); document.body.appendChild(x); } </script> </body> </html>