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+<template>
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+ <div v-loading="loading" class="qrcode__wrap" :style="wrapStyle">
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+ <component :is="tag" ref="wrapRef" @click="clickCode" />
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+ <div v-if="disabled" class="disabled__wrap" @click="disabledClick">
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+ <div>
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+ <i class="el-icon-refresh-right" />
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+ <div>{{ disabledText }}</div>
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+ </div>
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+ </div>
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+ </div>
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+</template>
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+
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+<script lang="ts">
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+import { defineComponent, PropType, nextTick, ref, watch, computed, unref } from 'vue'
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+import type { LogoTypes } from './types'
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+import QRCode from 'qrcode'
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+import type { QRCodeRenderersOptions } from 'qrcode'
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+import { deepClone } from '@/utils'
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+import { isString } from '@/utils/is'
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+const { toCanvas, toDataURL } = QRCode
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+export default defineComponent({
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+ name: 'Qrcode',
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+ props: {
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+ // img 或者 canvas,img不支持logo嵌套
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+ tag: {
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+ type: String as PropType<'canvas' | 'img'>,
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+ default: 'canvas',
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+ validator: (v: string) => ['canvas', 'img'].includes(v)
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+ },
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+ // 二维码内容
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+ text: {
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+ type: [String, Array] as PropType<string | any[]>,
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+ default: null
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+ },
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+ // qrcode.js配置项
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+ options: {
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+ type: Object as PropType<QRCodeRenderersOptions>,
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+ default: null
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+ },
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+ // 宽度
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+ width: {
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+ type: Number as PropType<number>,
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+ default: 200
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+ },
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+ // logo
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+ logo: {
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+ type: [String, Object] as PropType<Partial<LogoTypes> | string>,
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+ default: ''
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+ },
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+ // 是否过期
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+ disabled: {
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+ type: Boolean as PropType<boolean>,
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+ default: false
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+ },
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+ // 过期提示内容
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+ disabledText: {
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+ type: String as PropType<string>,
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+ default: '二维码已失效'
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+ }
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+ },
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+ emits: ['done', 'click', 'disabled-click'],
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+ setup(props, { emit }) {
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+ const loading = ref<boolean>(true)
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+ const wrapRef = ref<HTMLCanvasElement | HTMLImageElement | null>(null)
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+ const renderText = computed(() => String(props.text))
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+ const wrapStyle = computed(() => {
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+ return {
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+ width: props.width + 'px',
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+ height: props.width + 'px'
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+ }
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+ })
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+
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+ watch(
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+ () => renderText.value,
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+ (val) => {
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+ if (!val) return
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+ initQrcode()
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+ },
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+ {
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+ deep: true,
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+ immediate: true
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+ }
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+ )
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+
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+ // 初始化
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+ function initQrcode() {
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+ nextTick(async() => {
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+ const options = deepClone(props.options || {})
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+ if (props.tag === 'canvas') {
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+ // 容错率，默认对内容少的二维码采用高容错率，内容多的二维码采用低容错率
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+ options.errorCorrectionLevel = options.errorCorrectionLevel || getErrorCorrectionLevel(renderText.value)
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+ getOriginWidth(renderText.value, options).then(async(_width) => {
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+ options.scale = props.width === 0 ? undefined : (props.width / _width) * 4
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+ const canvasRef: any = await toCanvas(unref(wrapRef as any), renderText.value, options)
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+ if (props.logo) {
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+ const url = await createLogoCode(canvasRef)
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+ emit('done', url)
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+ loading.value = false
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+ } else {
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+ emit('done', canvasRef.toDataURL())
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+ loading.value = false
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+ }
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+ })
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+ } else {
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+ const url = await toDataURL(renderText.value, {
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+ errorCorrectionLevel: 'H',
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+ width: props.width,
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+ ...options
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+ })
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+ unref(wrapRef as any).src = url
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+ emit('done', url)
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+ loading.value = false
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+ }
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+ })
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+ }
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+
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+ // 生成logo
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+ function createLogoCode(canvasRef: HTMLCanvasElement) {
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+ const canvasWidth = canvasRef.width
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+ const logoOptions: LogoTypes = Object.assign({
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+ logoSize: 0.15,
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+ bgColor: '#ffffff',
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+ borderSize: 0.05,
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+ crossOrigin: 'anonymous',
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+ borderRadius: 8,
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+ logoRadius: 0
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+ }, isString(props.logo) ? {} : props.logo)
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+ const {
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+ logoSize = 0.15,
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+ bgColor = '#ffffff',
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+ borderSize = 0.05,
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+ crossOrigin = 'anonymous',
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+ borderRadius = 8,
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+ logoRadius = 0
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+ } = logoOptions
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+ const logoSrc = isString(props.logo) ? props.logo : props.logo.src
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+ const logoWidth = canvasWidth * logoSize
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+ const logoXY = (canvasWidth * (1 - logoSize)) / 2
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+ const logoBgWidth = canvasWidth * (logoSize + borderSize)
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+ const logoBgXY = (canvasWidth * (1 - logoSize - borderSize)) / 2
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+
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+ const ctx = canvasRef.getContext('2d')
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+ if (!ctx) return
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+
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+ // logo 底色
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+ canvasRoundRect(ctx)(logoBgXY, logoBgXY, logoBgWidth, logoBgWidth, borderRadius)
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+ ctx.fillStyle = bgColor
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+ ctx.fill()
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+
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+ // logo
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+ const image = new Image()
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+ if (crossOrigin || logoRadius) {
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+ image.setAttribute('crossOrigin', crossOrigin)
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+ }
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+ (image as any).src = logoSrc
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+
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+ // 使用image绘制可以避免某些跨域情况
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+ const drawLogoWithImage = (image: HTMLImageElement) => {
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+ ctx.drawImage(image, logoXY, logoXY, logoWidth, logoWidth)
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+ }
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+
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+ // 使用canvas绘制以获得更多的功能
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+ const drawLogoWithCanvas = (image: HTMLImageElement) => {
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+ const canvasImage = document.createElement('canvas')
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+ canvasImage.width = logoXY + logoWidth
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+ canvasImage.height = logoXY + logoWidth
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+ const imageCanvas = canvasImage.getContext('2d')
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+ if (!imageCanvas || !ctx) return
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+ imageCanvas.drawImage(image, logoXY, logoXY, logoWidth, logoWidth)
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+
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+ canvasRoundRect(ctx)(logoXY, logoXY, logoWidth, logoWidth, logoRadius)
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+ if (!ctx) return
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+ const fillStyle = ctx.createPattern(canvasImage, 'no-repeat')
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+ if (fillStyle) {
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+ ctx.fillStyle = fillStyle
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+ ctx.fill()
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+ }
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+ }
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+
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+ // 将 logo绘制到 canvas上
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+ return new Promise((resolve: any) => {
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+ image.onload = () => {
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+ logoRadius ? drawLogoWithCanvas(image) : drawLogoWithImage(image)
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+ resolve(canvasRef.toDataURL())
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+ }
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+ })
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+ }
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+
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+ // 得到原QrCode的大小，以便缩放得到正确的QrCode大小
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+ function getOriginWidth(content: string, options: QRCodeRenderersOptions) {
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+ const _canvas = document.createElement('canvas')
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+ return toCanvas(_canvas, content, options).then(() => _canvas.width)
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+ }
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+
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+ // 对于内容少的QrCode，增大容错率
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+ function getErrorCorrectionLevel(content: string) {
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+ if (content.length > 36) {
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+ return 'M'
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+ } else if (content.length > 16) {
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+ return 'Q'
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+ } else {
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+ return 'H'
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+ }
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+ }
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+
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+ // 点击二维码
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+ function clickCode() {
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+ emit('click')
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+ }
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+
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+ // 失效点击事件
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+ function disabledClick() {
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+ emit('disabled-click')
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+ }
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+
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+ // copy来的方法，用于绘制圆角
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+ function canvasRoundRect(ctx: CanvasRenderingContext2D) {
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+ return (x: number, y: number, w: number, h: number, r: number) => {
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+ const minSize = Math.min(w, h)
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+ if (r > minSize / 2) {
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+ r = minSize / 2
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+ }
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+ ctx.beginPath()
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+ ctx.moveTo(x + r, y)
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+ ctx.arcTo(x + w, y, x + w, y + h, r)
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+ ctx.arcTo(x + w, y + h, x, y + h, r)
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+ ctx.arcTo(x, y + h, x, y, r)
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+ ctx.arcTo(x, y, x + w, y, r)
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+ ctx.closePath()
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+ return ctx
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+ }
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+ }
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+
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+ return {
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+ loading,
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+ wrapRef,
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+ renderText,
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+ wrapStyle,
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+ clickCode,
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+ disabledClick
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+ }
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+ }
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+})
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+</script>
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+
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+<style lang="less" scoped>
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+.qrcode__wrap {
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+ display: inline-block;
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+ position: relative;
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+ .disabled__wrap {
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+ position: absolute;
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+ width: 100%;
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+ height: 100%;
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+ background: rgba(255,255,255,0.95);
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+ top: 0;
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+ left: 0;
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+ display: flex;
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+ align-items: center;
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+ justify-content: center;
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+ cursor: pointer;
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+ &>div {
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+ position: absolute;
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+ top: 50%;
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+ left: 50%;
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+ transform: translate(-50%, -50%);
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+ font-weight: bold;
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+ i {
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+ font-size: 30px;
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+ margin-bottom: 10px;
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+ }
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+ }
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+ }
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+}
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+</style>
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chenkl
