vue实现键盘输入支付密码功能

   支付密码功能界面如下图：

主要代码如下：

<template>
  <div class="pay-tool">
    <div class="pay-tool-title border-bottom">
      <span class="icon icon-back" @click="backHandle">span><strong>请输入交易密码strong>
    div>
    <div class="pay-tool-content">
      <div class="pay-tool-inputs">
        <div class="item" v-for="i in items"><span class="icon_dot" v-if="password[i]">span>div>
      div>
      <div class="pay-tool-link"><router-link class="link" to="/getP">忘记密码？router-link>div>
    div>
    <div class="pay-tool-keyboard">
      <ul>
        <li @click="keyUpHandle($event)" v-for="val in keys">
          {{ val }}
        li>
        <li class="del" @click="delHandle"><span class="icon-del"><span>li>
      ul>
    div>
  div>
template>

<script>
  const keys = () => [1, 2, 3, 4, 5, 6, 7, 8, 9, '', 0]
  // let sendFlag = true // 防止重复发送密码
  export default {
    data () {
      return {
        items: [0, 1, 2, 3, 4, 5],
        keys: keys(),
        password: []
      }
    },
    methods: {
      backHandle () {
        this.clearPasswordHandle()  // 返回时清除password
        this.$emit('backFnc') // 返回上级
      },
      keyUpHandle (e) {
        let text = e.currentTarget.innerText
        let len = this.password.length
        if (!text || len >= 6) return
        this.password.push(text)
        this.ajaxData()
      },
      delHandle () {
        if (this.password.length <= 0) return false
        this.password.shift()
      },
      ajaxData () {
        if (this.password.length >= 6) {
          console.log(parseInt(this.password.join(' ').replace(/\s/g, '')))
        }
        return false
      },
      clearPasswordHandle: function () {
        this.password = []
      }
    }
  }
script>

<style lang="less" scoped>
  .pay-tool {
    position: relative;
    height: 18.93333333rem;
    background-color: #fff;
    overflow: hidden;
    &-title {
      width: 100%;
      height: 2.08888888rem;
      padding: 0 0.8rem;
      line-height: 2.08888888rem;
      text-align: center;
      overflow: hidden;
      .icon {
        float: left;
        margin-top: 0.72222222rem;
      }
      strong {
        font-size: 0.8rem;
      }
    }
    &-content {
      .pay-tool-inputs {
        width: 14.46666666rem;
        height: 2.31111111rem;
        margin: 1.28888888rem auto 0;
        border: 1px solid #b9b9b9;
        border-radius: 0.26666666rem;
        box-shadow: 0 0 1px #e6e6e6;
        display: flex;
        .item {
          width: 16.66666666%;
          height: 2.31111111rem;
          border-right: 1px solid #b9b9b9;
          line-height: 2.31111111rem;
          text-align: center;
          &:last-child {
            border-right: none;
          }
          .icon_dot {
            display: inline-block;
            width: 0.51111111rem;
            height: 0.51111111rem;
            background: url("../../assets/images/icon_dot.png") no-repeat;
            background-size: cover;
          }
        }
      }
      .pay-tool-link {
        padding: 0.53333333rem 0.8rem 0;
        text-align: right;
        .link {
          font-size: 0.66666666rem;
          color: #3c8cfb;
        }
      }
    }
    .pay-tool-keyboard {
      position: absolute;
      left: 0;
      bottom: 0;
      width: 100%;
      ul {
        width: 100%;
        display: flex;
        flex-wrap: wrap;
        li {
          width: 33.3333%;
          height: 2.25442834rem;
          line-height: 2.25442834rem;
          text-align: center;
          border-right: 1px solid #aeaeae;
          border-bottom: 1px solid #aeaeae;
          font-size: 0.8rem;
          font-weight: bold;
          &:nth-child(1), &:nth-child(2), &:nth-child(3) {
            border-top: 1px solid #eee;
          }
          &:nth-child(3), &:nth-child(6), &:nth-child(9), &:nth-child(12) {
            border-right: none;
          }
          &:nth-child(10), &:nth-child(11), &:nth-child(12) {
            border-bottom: none;
          }
          &:nth-child(10), &:nth-child(12), &:active {
            background-color: #d1d4dd;
          }
          &:nth-child(12):active {
            background-color: #fff;
          }
        }
      }
    }
  }
style>

注意：页面使用rem布局，根html的font-size为45px。