[] H5 H5 add input attributes

1. placeholder 占位提示

    <input  placeholder="请输入XXXX">

   

2. autofocus 自动获取焦点

    <input autofocus>

    

3. autocomplete 自动提示

    <form action="">
         <!--  前提1.成功提交;2.必须有name属性-->
         <!--  on 打开 off关闭-->
         <input name="name" autocomplete="on">
         <button type="submit">sub</button>
       </form>

   

4. required 必填字段，如果缺失阻止提交

    <form action="">
         <input name="tel" required>
         <button type="submit">sub</button>
       </form>

   

5. pattern 正则验证

   <form action="">
         <!--验证手机号-->
         <input name="tel" pattern="^(\+86)?1\d{10}$">
         <button type="submit">sub</button>
       </form>

   

6. multiple type为file时可选择多个文件，email时可传多邮箱(以“，”分割)

    <!--选择多个文件-->
         <input type="file" multiple>

   <form action="">
             <input name="email" type="email" multiple>
             <button type="submit">sub</button>
           </form>

7. from the outer buttons to specify the form submit form

   <form action="" id="f1">
         <input name="email" type="email" multiple>
       </form>
       <button type="submit" form="f1">sub</button>