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<!DOCTYPE html> <html> <body> <h3>如何访问数字字段的演示</h3> <input type="number" id="myNumber" value="2"> <p>点击按钮获取数字字段的数字。</p> <button onclick="myFunction()">试一试</button> <p><strong>注意</strong> IE 9 及更早版本不支持带有 type="number" 的输入元素。</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myNumber").value; document.getElementById("demo").innerHTML = x; } </script> </body> </html>