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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> </head> <body> <p>点击按钮创建带有文本的 LEGEND 元素。</p> <fieldset id="myFieldset"> 用户名: <input type="text"> </fieldset><br> <button onclick="myFunction()">尝试一下</button> <script> function myFunction(){ var x = document.createElement("LEGEND"); var t = document.createTextNode("Personalia:"); x.appendChild(t); document.getElementById("myFieldset").appendChild(x); }; </script> </body> </html>