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> 登录: <input type="email" id="myEmail" placeholder="Email"> <p>点击按钮显示 email 字段的预期文本值。</p> <button onclick="myFunction()">点我</button> <p><strong>注意:</strong> IE 9 (及更早IE版本 earlier)， Safari不支持input type="email" 元素。</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myEmail").placeholder; document.getElementById("demo").innerHTML = x; } </script> </body> </html>
运行结果