<div class="security-code-wrap">
 <label for="code">
  <ul class="security-code-container">
  <li class="field-wrap" v-for="(item, index) in number" :key="index">
   <i class="char-field">{{value[index] || placeholder}}</i>
  </li>
  </ul>
 </label>
 <input ref="input" class="input-code" @keyup="handleInput($event)" v-model="value"
   id="code" name="code" type="tel" :maxlength="number"
   autocorrect="off" autocomplete="off" autocapitalize="off">
</div>

.input-code {
 position: absolute;
 left: -9999px;
 top: -99999px;
 width: 0;
 height: 0;
 opacity: 0;
 overflow: visible;
 z-index: -1;
}

handleSubmit() {
 this.$emit('input', this.value)
},
handleInput(e) {
 this.$refs.input.value = this.value
 if (this.value.length >= this.number) {
  this.hideKeyboard()
 }
 this.handleSubmit()
}

hideKeyboard() {
 // 输入完成隐藏键盘
 document.activeElement.blur() // ios隐藏键盘
 this.$refs.input.blur() // android隐藏键盘
}

<!--四位验证码输入框组件-->
<template>
 <div class="security-code-wrap">
 <label for="code">
  <ul class="security-code-container">
  <li class="field-wrap" v-for="(item, index) in number" :key="index">
   <i class="char-field">{{value[index] || placeholder}}</i>
  </li>
  </ul>
 </label>
 <input ref="input" class="input-code" @keyup="handleInput($event)" v-model="value"
   id="code" name="code" type="tel" :maxlength="number"
   autocorrect="off" autocomplete="off" autocapitalize="off">
 </div>
</template>
<script>
 export default {
 name: 'SecurityCode',
 // component properties
 props: {
  number: {
  type: Number,
  default: 4
  },
  placeholder: {
  type: String,
  default: '-'
  }
 },
 // variables
 data() {
  return {
  value: ''
  }
 },
 methods: {
  hideKeyboard() {
  // 输入完成隐藏键盘
  document.activeElement.blur() // ios隐藏键盘
  this.$refs.input.blur() // android隐藏键盘
  },
  handleSubmit() {
  this.$emit('input', this.value)
  },
  handleInput(e) {
  this.$refs.input.value = this.value
  if (this.value.length >= this.number) {
   this.hideKeyboard()
  }
  this.handleSubmit()
  }
 }
 }
</script>
<style scoped lang="less">
 .security-code-wrap {
 overflow: hidden;
 }
 .security-code-container {
 margin: 0;
 padding: 0;
 display: flex;
 justify-content: center;
 .field-wrap {
  list-style: none;
  display: block;
  width: 40px;
  height: 40px;
  line-height: 40px;
  font-size: 16px;
  background-color: #fff;
  margin: 2px;
  color: #000;
  .char-field {
  font-style: normal;
  }
 }
 }
 .input-code {
 position: absolute;
 left: -9999px;
 top: -99999px;
 width: 0;
 height: 0;
 opacity: 0;
 overflow: visible;
 z-index: -1;
 }
</style>

<security-code v-model="authCode"></security-code>