W3School TIY
编辑您的代码：
<!DOCTYPE html> <html> <body> <h3>演示如何访问 Number 字段</h3> <input type="number" id="myNumber" value="2"> <p>点击按钮来获得 number 字段的数字。</p> <button onclick="myFunction()">试一下</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myNumber").value; document.getElementById("demo").innerHTML = x; } </script> </body> </html>
查看结果: