h5表单验证

pattern验证

requried 必输字段

<form action="/a/b/c" method="get">

    a:<input type="text" name="a" pattern="[a-z]{3}" title="输入3个小写字母“/>

    b:<input type="text" name="b" pattern="[a-z]{3}" required="required" title="输入3个小写字母“/>

    <input type="submit"/>

</form>