分格输入框

1、效果预览

2、代码

import { ref } from "vue";
const value = ref("");
const counts = ref(4);
const isFocus = ref(false);
const inputFocus = () => {
  isFocus.value = true;
};
const inputBlur = () => {
  isFocus.value = false;
};
const handleInput = (e) => {
  value.value = e.target.value = e.target.value.replace(/[^\d]/g, "");
};
</script>

<template>
  <div>
    <div class="content">
      <input
        class="input"
        type="text"
        :value="value"
        :maxlength="counts"
        @focus="inputFocus"
        @blur="inputBlur"
        @input="handleInput"
      />
      <div class="wrap">
        <div
          v-for="count in counts"
          :key="count"
          :class="[
            'wrap_item',
            isFocus &&
            (count - 1 === value.length ||
              (value.length === counts && count === counts))
              ? 'active'
              : '',
          ]"
        >
          {{ value[count - 1] || "" }}
        </div>
      </div>
    </div>
  </div>
</template>

<style scoped>
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
.content {
  position: relative;
  margin: 40px auto;
  height: 50px;
  width: 300px;
}
.input {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
}
.wrap {
  display: flex;
  justify-content: space-between;
  width: 100%;
  height: 100%;
}
.wrap_item {
  border: 1px solid grey;
  width: 50px;
  text-align: center;
  line-height: 50px;
  font-size: 30px;
}
.wrap_item.active {
  position: relative;
  border: 1px solid blue;
}
.wrap_item.active::after {
  content: " ";
  width: 0;
  border-right: 2px solid grey;
  position: absolute;
  left: 50%;
  top: 10%;
  bottom: 10%;
  animation: mark 1s infinite ease;
}
@keyframes mark {
  0% {
    opacity: 0;
  }

  50% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}
</style>