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src/components/input-code.vue

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+<template>
+	<div class="input-code">
+		<input
+			ref="inputRef"
+			type="tel"
+			maxlength="1"
+			v-for="(v, i) in props.length"
+			:key="i"
+			v-model="code[i]"
+			@input="handleInput(i)"
+			@keydown.delete="handleDelete(i)"
+			@paste="handlePaste"
+		/>
+	</div>
+</template>
+
+<script setup lang="ts">
+	import { onMounted, ref, computed, watch, nextTick } from 'vue'
+	const emit = defineEmits(['submit', 'update:modelValue'])
+	const props = defineProps({
+		length: {
+			type: Number,
+			default: 6
+		}
+	})
+	const inputRef = ref('')
+	const code = ref([])
+	const codeStr = computed(() => code.value.join(''))
+	watch(codeStr, (newVal) => {
+		emit('update:modelValue', newVal)
+	})
+	const resetCode = (size) => {
+		code.value = []
+		for (let i = 0; i < size; i++) {
+			code.value.push('')
+		}
+	}
+	resetCode(props.length)
+	const handleInput = (index: number) => {
+		const value = code.value[index]
+		if (value) {
+			if (/[0-9]/.test(value)) {
+				code.value[index] = value
+				focusLast()
+			} else {
+				code.value[index] = ''
+			}
+		}
+		submit()
+	}
+	const handleDelete = (index: number) => {
+		if (code.value[index].length == 0) {
+			focusLast(-1)
+		}
+	}
+	const handlePaste = (e: ClipboardEvent) => {
+		const text = e.clipboardData?.getData('text')
+		if (text) {
+			const nums = text.match(/[0-9]/g) || []
+			if (nums.length === code.value.length) {
+				code.value = [...nums]
+				focusLast()
+				nextTick(submit)
+			}
+		}
+	}
+	// 聚焦最后一个没有输入的
+	const focusLast = (step = 0) => {
+		let index = code.value.findIndex((item) => !item) + step
+		index < 0 && (index = 0)
+		if (index >= 0 && index < props.length) {
+			inputRef.value[index]?.focus?.()
+		}
+		if (code.value.every((item) => item.length)) {
+			inputRef.value?.forEach((item) => item.blur?.())
+		}
+	}
+	const submit = () => {
+		if (codeStr.value.length === props.length) {
+			emit('submit', codeStr.value)
+		}
+	}
+	onMounted(() => {
+		focusLast()
+	})
+</script>
+
+<style lang="less" scoped>
+	.input-code {
+		width: 100%;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		> input {
+			width: 7rem;
+			height: 7rem;
+			border-radius: 1rem;
+			border: 0.02rem solid #dfdfdf;
+			text-align: center;
+			margin: auto;
+		}
+	}
+</style>