69 lines
2.2 KiB
Vue
69 lines
2.2 KiB
Vue
<template>
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<div class="aa-card">
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<div class="aa-card-field" :class="{ 'is-focus': focused, 'is-valid': valid, 'is-invalid': invalid }">
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<input
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class="aa-card-input"
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:value="display"
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inputmode="numeric"
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maxlength="23"
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:placeholder="placeholder"
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@input="onInput"
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@focus="focused = true"
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@blur="focused = false"
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/>
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<span class="aa-card-type" :class="{ unknown: !cardType }">{{ cardType || '未知' }}</span>
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</div>
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<div class="aa-card-tip" :class="tipClass">{{ tipText }}</div>
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</div>
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</template>
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<script setup>
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import { ref, computed } from 'vue';
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const props = defineProps({
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modelValue: { type: String, default: '' },
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placeholder: { type: String, default: '请输入银行卡号' }
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});
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const emit = defineEmits(['update:modelValue']);
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const digits = ref(props.modelValue.replace(/\D/g, ''));
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const focused = ref(false);
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const display = computed(() => digits.value.replace(/(.{4})/g, '$1 ').trim());
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const cardType = computed(() => {
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const v = digits.value;
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if (/^4/.test(v)) return 'Visa';
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if (/^5[1-5]/.test(v)) return 'MasterCard';
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if (/^62/.test(v)) return '银联';
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if (/^3[47]/.test(v)) return 'AmEx';
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if (/^35/.test(v)) return 'JCB';
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return '';
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});
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const luhn = computed(() => {
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const v = digits.value;
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let sum = 0, alt = false;
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for (let i = v.length - 1; i >= 0; i--) {
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let n = parseInt(v[i], 10);
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if (alt) { n *= 2; if (n > 9) n -= 9; }
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sum += n; alt = !alt;
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}
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return sum % 10 === 0;
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});
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const valid = computed(() => digits.value.length >= 13 && luhn.value);
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const invalid = computed(() => digits.value.length >= 13 && !luhn.value);
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const tipClass = computed(() => (valid.value ? 'valid' : invalid.value ? 'invalid' : ''));
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const tipText = computed(() => {
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if (digits.value.length === 0) return '支持 Visa / MasterCard / 银联等';
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if (valid.value) return '卡号校验通过';
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if (invalid.value) return '卡号未通过 Luhn 校验';
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return '继续输入卡号…';
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});
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function onInput(e) {
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digits.value = e.target.value.replace(/\D/g, '').slice(0, 19);
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e.target.value = display.value;
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emit('update:modelValue', digits.value);
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}
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</script>
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<style src="./BankCardInput.css"></style>
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