在 Vue 中简单实现一个 6 个输入框的验证码组件

<template>  <div class="input-box">    <div class="input-content" @keydown="keydown" @keyup="keyup" @paste="paste" @mousewheel="mousewheel"        @input="inputEvent">      <input max="9" min="0" maxlength="1" data-index="0" v-model.trim.number="input[0]" type="number"          ref="firstinput"/>      <input max="9" min="0" maxlength="1" data-index="1" v-model.trim.number="input[1]" type="number"/>      <input max="9" min="0" maxlength="1" data-index="2" v-model.trim.number="input[2]" type="number"/>      <input      <input max="9" min="0" maxlength="1" data-index="4" v-model.trim.number="input[4]" type="number"/>      <input max="9" min="0" maxlength="1" data-index="5" v-model.trim.number="input[5]" type="number"/>    </div>  </div></template>

<style scoped>  .input-box {    .input-content {      width: 512px;      height: 60px;      display: flex;      align-items: center;      justify-content: space-between;
      input {        color: inherit;        font-family: inherit;        border: 0;        outline: 0;        border-bottom: 1px solid #919191;        height: 60px;        width: 60px;        font-size: 44px;        text-align: center;      }    }
    input::-webkit-outer-spin-button,    input::-webkit-inner-spin-button {      appearance: none;      margin: 0;    }  }</style>

<script>  export default {    data() {      return {        // 存放粘贴进来的数字        pasteResult: [],      };    },    props: ['code'],    computed: {      input() {        // code 是父组件传进来的默认值，必须是6位长度的数组，这里就不再做容错判断处理        // 最后空数组是默认值        return this.code || this.pasteResult.length === 6 ? this.pasteResult : ['', '', '', '', '', '']      }    },    methods: {      // 解决一个输入框输入多个字符      inputEvent(e) {        var index = e.target.dataset.index * 1;        var el = e.target;        this.$set(this.input, index, el.value.slice(0, 1))      },      keydown(e) {        var index = e.target.dataset.index * 1;        var el = e.target;        if (e.key === 'Backspace') {          if (this.input[index].length > 0) {            this.$set(this.input, index, '')          } else {            if (el.previousElementSibling) {              el.previousElementSibling.focus()              this.$set(this.input, index - 1, '')            }          }        } else if (e.key === 'Delete') {          if (this.input[index].length > 0) {            this.$set(this.input, index, '')          } else {            if (el.nextElementSibling) {              this.$set(this.input, index = 1, '')            }          }          if (el.nextElementSibling) {            el.nextElementSibling.focus()          }        } else if (e.key === 'Home') {          el.parentElement.children[0] && el.parentElement.children[0].focus()        } else if (e.key === 'End') {          el.parentElement.children[this.input.length - 1] && el.parentElement.children[this.input.length - 1].focus()        } else if (e.key === 'ArrowLeft') {          if (el.previousElementSibling) {            el.previousElementSibling.focus()          }        } else if (e.key === 'ArrowRight') {          if (el.nextElementSibling) {            el.nextElementSibling.focus()          }        } else if (e.key === 'ArrowUp') {          if (this.input[index] * 1 < 9) {            this.$set(this.input, index, (this.input[index] * 1 + 1).toString());          }        } else if (e.key === 'ArrowDown') {          if (this.input[index] * 1 > 0) {            this.$set(this.input, index, (this.input[index] * 1 - 1).toString());          }        }      },      keyup(e) {        var index = e.target.dataset.index * 1;        var el = e.target;        if (/Digit|Numpad/i.test(e.code)) {          this.$set(this.input, index, e.code.replace(/Digit|Numpad/i, ''));          el.nextElementSibling && el.nextElementSibling.focus();          if (index === 5) {            if (this.input.join('').length === 6) {              document.activeElement.blur();              this.$emit('complete', this.input);            }          }        } else {          if (this.input[index] === '') {            this.$set(this.input, index, '');          }        }      },      mousewheel(e) {        var index = e.target.dataset.index;        if (e.wheelDelta > 0) {          if (this.input[index] * 1 < 9) {            this.$set(this.input, index, (this.input[index] * 1 + 1).toString());          }        } else if (e.wheelDelta < 0) {          if (this.input[index] * 1 > 0) {            this.$set(this.input, index, (this.input[index] * 1 - 1).toString());          }        } else if (e.key === 'Enter') {          if (this.input.join('').length === 6) {            document.activeElement.blur();            this.$emit('complete', this.input);          }        }      },      paste(e) {        // 当进行粘贴时        e.clipboardData.items[0].getAsString(str => {          if (str.toString().length === 6) {            this.pasteResult = str.split('');            document.activeElement.blur();            this.$emit('complete', this.input);          }        })      }    },    mounted() {      // 等待dom渲染完成，在执行focus,否则无法获取到焦点      this.$nextTick(() => {        this.$refs.firstinput.focus()      })    },  }</script>