<!DOCTYPE HTML>
<html>
<body>
<form action="/example/demo_form.aspx" method="get">
E-mail: <input type="email" name="lname" /><br />
<button type="submit" >提交</button><br />
<button type="submit" formnovalidate="formnovalidate">进行没有验证的提交</button>
</form>
</body>
</html>