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> <p>修改 email 字段的 email 地址,并点击按钮。</p> E-mail: <input type="email" id="myEmail" value="johndoe@example.com"> <p>注意默认值不会因为你修改了自动的值而改变。</p> <button type="button" onclick="myFunction()">尝试一下</button> <p><strong>注意:</strong> Internet Explorer 9 及更早 IE 版本,Safari 浏览器不支持 <input type="email"> 元素。</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myEmail"); var defaultVal = x.defaultValue; var currentVal = x.value; if (defaultVal == currentVal) { document.getElementById("demo").innerHTML = "默认值与当前值是相同的: " + x.defaultValue + " 和 " + x.value + "<br>修改email字段的email地址会看起来有所不同!"; } else { document.getElementById("demo").innerHTML = "默认值为: " + defaultVal + "<br>当期值为: " + currentVal; } } </script> </body> </html>
运行结果