<meta content="text/html;charset=utf-8" http-equiv="Content-Type" />
<script type="text/javascript" src="//apps.bdimg.com/libs/jquery/1.11.3/jquery.min.js">
<p>valid属性true为可以提交,设置了必填属性,填了就为true
<input type= "text" id= "txt" required onblur = "show()"/></p>
<input type= "text" id = "txt2" required onblur = "show2()"/></p>
<p>typeMismatch属性,判断输入的和当前文本框类型是否一致;
email:<input type="email" id="ty" required onblur = "show3()"/></p>
<input type = "text" id= "tt" pattern = "[0-9]{8}" required onblur ="show4()"/>