xcx/pages/index/index.wxml

<!--index.wxml-->
<form bindsubmit="getFormVal">
  <input type="text" placeholder="请输入内容" bindtap="getIptVal" name="age" />
  <input type="text" placeholder="请输入内容" bindtap="getIptVal" name="name" />
  <input type="text" placeholder="请输入内容" bindtap="getIptVal" name="likes" />
  <button form-type="submit">
    提交
  </button>
</form>