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                # qrcode.vue vue中使用vue-qrcode生成二維碼 ``` npm install --save qrcode.vue npm i qrcodejs2 getBlob(base64) { const mimeString = base64.split(',')[0].split(':')[1].split(';')[0]; // mime類型 const byteString = atob(base64.split(',')[1]); // base64 解碼 const arrayBuffer = new ArrayBuffer(byteString.length); // 創建緩沖數組 const intArray = new Uint8Array(arrayBuffer); // 創建視圖 for (let i = 0; i < byteString.length; i += 1) { intArray[i] = byteString.charCodeAt(i); } return new Blob([intArray], { type: mimeString, }); }, savePicture(Url = this.qrcodeUrl) { const blob = new Blob([''], { type: 'application/octet-stream' }); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = Url; // eslint-disable-next-line prefer-destructuring a.download = Url.replace(/(.*\/)*([^.]+.*)/gi, '$2').split('?')[0]; const e = document.createEvent('MouseEvents'); e.initMouseEvent( 'click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null, ); a.dispatchEvent(e); URL.revokeObjectURL(url); }, _qrcode(url) { const div = document.createElement('div'); // eslint-disable-next-line new-cap const code = new QRCode(div, { text: url, width: 500, height: 500, colorDark: '###000000', colorLight: '###ffffff', correctLevel: QRCode.CorrectLevel.L, }); // 這里如果需要在頁面上展示的話,就將div節點給添加到dom樹上去;node.appendChild(div) const canvas = code._el.querySelector('canvas'); // 獲取生成二維碼中的canvas,并將canvas轉換成base64 const base64Text = canvas.toDataURL('image/png'); const blob = this.getBlob(base64Text); // 將base64轉換成blob對象 return window.URL.createObjectURL(blob); }, ``` # vue-qrcode ``` //1,引入, import VueQrcode from '@xkeshi/vue-qrcode'; Vue.component(VueQrcode.name, VueQrcode); //2,使用: <div id="qrcode">二維碼位置</div> <qrcode v-if="code" :value="code" :options="{ size: 200 }"></qrcode> data(){ return:{ code:'' } } methods:{ setCode(){ setTimeout(()=>{ this.code='https://www.baidu.com' },3000) } }, mounted(){ this.setCode() } ```
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