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<!DOCTYPE html> <html> <body> <h3>如何访问 TEXTAREA 元素的演示</h3> Address:<br> <textarea id="myTextarea"> 342 Alvin Road Ducksburg</textarea> <p>点击按钮获取文本区域的内容。</p> <button type="button" onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myTextarea").value; document.getElementById("demo").innerHTML = x; } </script> </body> </html>