直接上代码！

  
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import { isEmpty, validate } from '../../utils/util';
const icon = 'none', duration = 3000

const component = {

  properties: {
    vehicleNo: { type: String, value: undefined } // 车牌号
  },
  data: {
    provinces: [ // 省份键盘
      ['京', '沪', '粤', '津', '冀', '晋', '蒙', '辽', '吉', '黑'],
      ['苏', '浙', '皖', '闽', '赣', '鲁', '豫', '鄂', '湘'],
      ['桂', '琼', '渝', '川', '贵', '云', '藏'],
      ['陕', '甘', '青', '宁', '新']
    ],
    numbers: [ // 数字键盘
      ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
    ],
    letters: [ // 字母键盘
      ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K'],
      ['L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V'],
      ['W', 'X', 'Y', 'Z', '挂', '港', '澳', '学']
    ],
    specialChar: ['挂', '港', '澳', '学'], // 特殊字符
    carNum: Array(8).fill({ value: undefined, focus: false }),
    focusIndex: 0, // 输入库焦点索引
    showNewPower: false, // 是否新能源车牌
    KeyboardState: false // 是否弹出虚拟键盘
  },
  attached() {
    const v = this
    const vehcles = v.data.vehicleNo.split('')
    const carNum = v.data.carNum
    vehcles.forEach((m, i) => { carNum[i].value = m })
    v.setData({ carNum })
  },
  /**
 * 组件的方法列表
 */
  methods: {
    // 车牌输入框点击展开车牌键盘
    openKeyboard(e) {
      const v = this
      const focusIndex = e.target.dataset.index
      let carNum = v.data.carNum
      let showNewPower = v.data.showNewPower

      // 添加新能源尾数
      if (focusIndex === 7) {
        if (isEmpty(v.data.carNum[6].value)) return wx.showToast({ title: '为新能源车牌时，前几位车牌号不能为空', icon, duration })
        if (v.data.specialChar.includes(v.data.carNum[6].value)) return wx.showToast({ title: `为新能源车牌时，第6位车牌号不能为'${v.data.carNum[6].value}'`, icon, duration })

        showNewPower = true
        v.setData({ showNewPower, KeyboardState: true })
      }

      // 当前点击获得焦点，其余失去焦点
      carNum[focusIndex].focus = true
      carNum = carNum.map((item, index) => {
        return { ...item, focus: index === focusIndex ? item.focus : false }
      })
      // 点击索引不为新能源时
      if (focusIndex !== 7) showNewPower = false

      v.setData({ KeyboardState: true, focusIndex, carNum, showNewPower })
    },
    // 键盘选中点击设置
    bindChoose(e) {
      const v = this
      const val = e.target.dataset.val
      const carNum = v.data.carNum
      let focusIndex = v.data.focusIndex
      if (focusIndex !== 6 && v.data.specialChar.includes(val)) return

      // 当前选中车牌无值时更新为输入值
      if (isEmpty(carNum[focusIndex].value)) {
        carNum[focusIndex].value = val
        carNum[focusIndex].focus = false

        const validate = v.data.showNewPower ? 7 : 6
        // 上一位车牌取消聚焦
        if (focusIndex  m.value).join('');
      if (!validate.vehicle(vheicleNo)) return wx.showToast({ title: '请输入正确的车牌', icon, duration })
      v.setData({ KeyboardState: false })
      v.triggerEvent('confirm', { vheicleNo })
    }
  }
}

Component(component);

/* 车牌号码 */
.com-carNumber-item {
  width: 55rpx;
  height: 60rpx;
  font-size: 18px;
  border: 2rpx solid #CCCCCC;
  border-radius: 8rpx;
  display: inline-block;
  line-height: 30px;
  margin: 0 2rpx;
  vertical-align: middle;
  caret-color: transparent;
}

.com-focus {
  border: 4rpx solid #A8BFF3;
}

/* 新能源 */
.com-carNumber-item-newpower {
  border: 2rpx dashed #19e622;
  background-color: #e1fde2;
  color: #19e622;
  font-size: 25px;
  line-height: 45rpx;
}

/* 虚拟键盘 */
.com-keyboard {
  height: auto;
  background: #d1d5d9;
  position: fixed;
  bottom: 0;
  width: 100%;
  left: 0;
  padding-bottom: 30rpx;
}

.com-keyboard-item {
  padding: 10rpx 0 5rpx 0;
  position: relative;
  display: block;
}

.com-vehicleTip {
  flex: 1;
  color: rgba(150, 179, 253, 1);
}

.com-separator {
  width: 1px;
  height: 50%;
  background-color: #ccc;
  margin: 0 10px;
}

.com-keyboardConfirm {
  height: 70rpx;
  background-color: #f7f7f7;
}

.com-keyboardConfirm_btn {
  float: right;
  line-height: 70rpx;
  font-size: 15px;
  margin-right: 30rpx;
  color: #FFA500;
}

.com-keyboard-line {
  margin: 0 auto;
  text-align: center;
}

.com-carNumber .com-keyboard-line {
  text-align: left;
  margin-left: 5rpx;
}

.com-keyboard-btn {
  font-size: 18px;
  color: #333333;
  background: #fff;
  display: inline-block;
  padding: 18rpx 0;
  width: 63rpx;
  text-align: center;
  box-shadow: 0 2rpx 0 0 #999999;
  border-radius: 10rpx;
  margin: 5rpx 6rpx;
}

.com-keyboard-disabled-btn {
  font-size: 18px;
  color: #333333;
  background: #cacaca;
  display: inline-block;
  padding: 18rpx 0;
  width: 63rpx;
  text-align: center;
  box-shadow: 0 2rpx 0 0 #999999;
  border-radius: 10rpx;
  margin: 5rpx 6rpx;
}

.com-keyboard-del {
  color: black;
  background: #A7B0BC;
  display: inline-block;
  padding: 10rpx 25rpx;
  box-shadow: 0 2rpx 0 0 #999999;
  border-radius: 10rpx;
  margin: 5rpx;
  position: absolute;
  bottom: 10rpx;
  right: 12rpx;
}

.text-center {
  text-align: center;
}

.inline-block {
  display: inline-block;
}

.ml-5 {
  margin-left: 5rpx;
}

.mr-5 {
  margin-right: 5;
}

.fs-40 {
  font-size: 40rpx;
}

.bold {
  font-weight: bold;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

/**
 * 是否都是空数据（类型：字符串，数值，对象，数组，布尔）
 */
const isEmpty = (...values) => {
  const isEmptyFunc = (val) => {
    switch (typeof val) {
      case 'string':
      case 'number': return !val // 数值0为空
      case 'object':
        // 数组
        if (Array.isArray(val)) return val.length === 0
        // null/对象
        return val === null || Object.keys(val).length === 0
      case 'boolean': return false // 布尔类型即非空
      // undefined / function
      default: return true
    }
  }
  let result = true
  values.forEach(m => { result = result && isEmptyFunc(m) })

  return result
}

/**
 * 验证
 */
const validate = {
  /** 是车牌号 */
  vehicle(value) {
    let result = false
    if (value && [7, 8].includes(value.length)) {
      const express = /^[京津沪渝冀豫云辽黑湘皖鲁新苏浙赣鄂桂甘晋蒙陕吉闽贵粤青藏川宁琼使领A-Z]{1}[A-Z]{1}[A-Z0-9]{4,5}[A-Z0-9挂学警港澳]{1}$/
      result = express.test(value)
    }
    return result
  }
}