index.vue
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<template>
<div>
<component :is="tag" ref="wrapRef"></component>
</div>
</template>
<script lang="ts">
import { defineComponent, watchEffect, PropType, ref, unref } from 'vue';
import { toCanvas, QRCodeRenderersOptions, LogoType } from './qrcodePlus';
import { toDataURL } from 'qrcode';
import { downloadByUrl } from '/@/utils/file/download';
export default defineComponent({
name: 'QrCode',
emits: { done: (url: string) => !!url, error: (error: any) => !!error },
props: {
value: {
type: [String, Array] as PropType<string | any[]>,
default: null,
},
// 参数
options: {
type: Object as PropType<QRCodeRenderersOptions>,
default: null,
},
// 宽度
width: {
type: Number as PropType<number>,
default: 200,
},
// 中间logo图标
logo: {
type: [String, Object] as PropType<Partial<LogoType> | string>,
default: '',
},
// img 不支持内嵌logo
tag: {
type: String as PropType<'canvas' | 'img'>,
default: 'canvas',
validator: (v: string) => ['canvas', 'img'].includes(v),
},
},
setup(props, { emit }) {
const wrapRef = ref<HTMLCanvasElement | HTMLImageElement | null>(null);
const urlRef = ref<string>('');
async function createQrcode() {
try {
const { tag, value, options = {}, width, logo } = props;
const renderValue = String(value);
const wrapEl = unref(wrapRef);
if (!wrapEl) return;
if (tag === 'canvas') {
const url: string = await toCanvas({
canvas: wrapEl,
width,
logo: logo as any,
content: renderValue,
options: options || {},
});
urlRef.value = url;
emit('done', url);
return;
}
if (tag === 'img') {
const url = await toDataURL(renderValue, {
errorCorrectionLevel: 'H',
width,
...options,
});
(unref(wrapRef) as HTMLImageElement).src = url;
urlRef.value = url;
emit('done', url);
}
} catch (error) {
emit('error', error);
}
}
/**
* file download
*/
function download(fileName?: string) {
const url = unref(urlRef);
if (!url) return;
downloadByUrl({
url,
fileName,
});
}
watchEffect(() => {
setTimeout(() => {
createQrcode();
}, 30);
});
return { wrapRef, download };
},
});
</script>