fmpq.com
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> E-mail: <input type="email" id="myEmail" maxlength="30"> <p>点击按钮显示 email 字段的 maxlength 属性值。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myEmail").maxLength; document.getElementById("demo").innerHTML = x; } </script> </body> </html>
运行结果