像微信支付密码那种输入框代码怎么写？一个input跳转下一个input

一个input跳转下一个input
  <li>
        <input type="tel" maxlength="1" tabindex="1"  onkeyup="checkLen(this,this.value)">
      </li>
      <li>
        <input type="tel" maxlength="1" tabindex="2"  onkeyup="checkLen(this,this.value)">
      </li>
      <li>
        <input type="tel" maxlength="1" tabindex="3"  onkeyup="checkLen(this,this.value)">
      </li>
      <li>
        <input type="tel" maxlength="1" tabindex="4"  onkeyup="checkLen(this,this.value)">
      </li>
      <li>
        <input type="tel"  maxlength="1" tabindex="5"  onkeyup="checkLen(this,this.value)">
      </li>
      <li>
        <input type="tel" maxlength="1" tabindex="6"  onkeyup="checkLen(this,this.value)">
      </li>