<html><body><h3>如何访问电子邮件字段的演示</h3>E-mail: <input type="email" id="myEmail" value="john@example.com"><p>单击该按钮可获取电子邮件字段的电子邮件地址。</p><button onclick="myFunction()">试一试</button><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myEmail").value; document.getElementById("demo").innerHTML = x;}</script></body></html>