YouTuan_wxapp/compone/code-input/code-input.wxml

<!--compone/code-input/code-input.wxml-->
<view class="input">
  <view class="input-item" wx:for="{{4}}" wx:key="index" data-index="{{index}}">
    <view class="input-value">{{password[index]}}</view>
    <view class="focus {{index === focusIndex ? 'show': 'hide'}}"></view>
  </view>
  <input class="input-password" maxlength="4" bindinput="setValue" bindblur="inputBlur" type="number" focus="{{focus}}"></input>
</view>