设计支付密码的输入框，如何输入一个密码之后自动跳到下一个input

<view class=“pass_view”>

      <input password type=“number” class=“password_input_start”  maxlength=“1” bindinput=“getpassword” tabindex=“1”/>

      <input password type=“number” class=“password_input_middle” maxlength=“1” bindinput=“getpassword” tabindex=“2”/>

      <input password type=“number” class=“password_input_middle” maxlength=“1” bindinput=“getpassword” tabindex=“3”/>

      <input password type=“number” class=“password_input_middle” maxlength=“1” bindinput=“getpassword” tabindex=“4”/>

      <input password type=“” class=“password_input_middle” maxlength=“1” bindinput=“getpassword” tabindex=“5”/>

      <input password type=“” class=“password_input_end” maxlength=“1” bindinput=“getpassword” tabindex=“6”/>

</view>