要实现的功能：
完全和单输入框一样的操作，甚至可以插入覆盖：
1，限制输入数字
2，正常输入
3，backspace删除
4，paste任意位置粘贴输入
5，光标选中一个数字，滚轮可以微调数字大小，限制0-9
6，123|456 自动覆盖光标后输入的字符，此时光标在3后，继续输入111，会得到123111，而不用手动删除456
7，封装成vue单文件组件，方便任意调用。
模板代码
<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>
<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>
实现了键盘的keydown/keyup/paste/input和鼠标滚轮mousewheel事件
使用了6个输入框的方案来实现。
样式部分：使用了scss模式
<style scoped lang="scss">.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>
具体实现逻辑：主要实现以上几个键盘事件操作。
<script>export default {data() {return {pasteResult: [],};},props: ['code'],computed: {input() {if (this.code && Array.isArray(this.code) && this.code.length === 6) {return this.code;} else if (/^d{6}$/.test(this.code.toString())) {return this.code.toString().split('');} else if (this.pasteResult.length === 6) {return this.pasteResult;} else {return new Array(6);}}},methods: {// 解决一个输入框输入多个字符inputEvent(e) {var index = e.target.dataset.index * 1;var el = e.target;el.value = el.value.replace(/Digit|Numpad/i, '').replace(/1/g, '').slice(0, 1);this.$set(this.input, index, el.value)},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;// 解决输入e的问题el.value = el.value.replace(/Digit|Numpad/i, '').replace(/1/g, '').slice(0, 1);if (/Digit|Numpad/i.test(e.code)) {// 必须在这里符直，否则输入框会是空值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.$emit('complete', this.input);this.pasteResult = [];} else {// 如果粘贴内容不合规，清除所有内容this.input[0] = new Array(6)}})}},mounted() {// 等待dom渲染完成，在执行focus,否则无法获取到焦点this.$nextTick(() => {this.$refs.firstinput.focus()})},}</script>
如果你发现了bug，或者有优化空间，欢迎你的指正和建议。我会随时更新到原代码当中，分享给大家。
作者：jsoncode
链接：人类身份验证 - SegmentFault
来源：SegmentFault 思否社区
