102 lines
2.1 KiB
Vue
102 lines
2.1 KiB
Vue
<template>
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<div class="qrcode-container">
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<canvas ref="qrcodeCanvas"></canvas>
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<div v-if="!text" class="qrcode-placeholder">请提供文本以生成二维码</div>
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</div>
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</template>
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<script setup>
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import { ref, onMounted, watch } from 'vue'
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import QRCode from 'qrcode'
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const props = defineProps({
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text: {
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type: String,
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required: true,
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default: ''
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},
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size: {
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type: Number,
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default: 128
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},
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options: {
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type: Object,
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default: () => ({})
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}
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})
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const qrcodeCanvas = ref(null)
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const generateQRCode = async () => {
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if (!props.text || !qrcodeCanvas.value) {
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// 如果没有文本或者canvas未准备好，则清空canvas
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const ctx = qrcodeCanvas.value?.getContext('2d');
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if (ctx) {
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ctx.clearRect(0, 0, qrcodeCanvas.value.width, qrcodeCanvas.value.height);
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}
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return;
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}
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try {
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const defaultOptions = {
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width: props.size,
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height: props.size,
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margin: 2,
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color: {
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dark: '#000000',
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light: '#ffffff'
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},
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errorCorrectionLevel: 'M' // 容错级别 L M Q H
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};
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const finalOptions = { ...defaultOptions, ...props.options };
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await QRCode.toCanvas(qrcodeCanvas.value, props.text, finalOptions);
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} catch (err) {
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console.error('生成二维码失败:', err);
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}
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}
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onMounted(() => {
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generateQRCode()
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})
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watch(() => [props.text, props.size, props.options], () => {
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generateQRCode()
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}, { deep: true })
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</script>
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<style scoped>
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.qrcode-container {
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display: inline-flex; /* 使容器适应内容大小 */
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justify-content: center;
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align-items: center;
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position: relative;
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border: 1px solid #eee;
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border-radius: 4px;
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padding: 8px;
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background-color: #fff;
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}
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canvas {
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display: block; /* 移除canvas默认的底部空间 */
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}
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.qrcode-placeholder {
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position: absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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display: flex;
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justify-content: center;
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align-items: center;
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font-size: 12px;
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color: #999;
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text-align: center;
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padding: 10px;
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box-sizing: border-box;
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background-color: rgba(255, 255, 255, 0.8);
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}
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</style> |