调用uni-app的扫码

// 允许从相机和相册扫码
uni.scanCode({
	success: function (res) {
		console.log('条码类型：' + res.scanType);
		console.log('条码内容：' + res.result);
	}
});

// 只允许通过相机扫码
uni.scanCode({
	onlyFromCamera: true,
	success: function (res) {
		console.log('条码类型：' + res.scanType);
		console.log('条码内容：' + res.result);
	}
});

// 调起条码扫描
uni.scanCode({
	scanType: ['barCode'],
	success: function (res) {
		console.log('条码类型：' + res.scanType);
		console.log('条码内容：' + res.result);
	}
});

实现

简易实现了扫码功能

scanCode(option) {
    let isFlash = false;

    // 创建一个空的webview
    const webview = plus.webview.open(
        '',
        'webview', {
            top: '0px',
            width: '100%',
            height: '100%',
            backButtonAutoControl: "close",
            titleNView: {
                backgroundColor: 'rgba(0, 0, 0, 0.5)',
                autoBackButton: true,
                titleColor: '#ffffff',
                titleText: "扫码"
            }
        })

    // 创建barcode
    const barcode = plus.barcode.create(
        'barcode',
        [plus.barcode.QR], // 只扫二维码
        {
            top: 'auto',
            left: 'auto',
            width: '100%',
            height: '100%',
            position: 'static',
            scanbarColor: '#f1c01f',
            frameColor: '#c0ff01'
        }
    )

    // 创建按钮“闪光灯”
    const bFlash = new plus.nativeObj.View('nbutton', {
        bottom: '20px',
        left: option.onlyFromCamera ? '30%' : '5%',
        width: '40%',
        height: '44px'
    }, [{
        tag: 'rect',
        id: 'rect',
        rectStyles: {
            radius: '8px',
            color: 'rgba(0,0,0,0.5)'
        }
    }, {
        tag: 'font',
        id: 'text',
        text: '闪光灯',
        textStyles: {
            color: '#FFFFFF'
        }
    }]);

    // 创建按钮“相册”
    const bAlbum = (!option.onlyFromCamera) && new plus.nativeObj.View('nbutton', {
        bottom: '20px',
        left: '55%',
        width: '40%',
        height: '44px'
    }, [{
        tag: 'rect',
        id: 'rect',
        rectStyles: {
            radius: '8px',
            color: 'rgba(0,0,0,0.5)'
        }
    }, {
        tag: 'font',
        id: 'text',
        text: '相册',
        textStyles: {
            color: '#FFFFFF'
        }
    }]);

    // 控制闪光灯按钮样式
    bFlash.addEventListener('touchend', (e) => {
        isFlash = !isFlash;
        isFlash && bFlash.drawText("闪光灯", null, {color: "#00ccff"}, 'text')
        !isFlash && bFlash.drawText("闪光灯", null, {color: "#ffffff"}, 'text')
        barcode?.setFlash(isFlash);
    }, false);

    // 相册选取图片进行扫码识别
    !option.onlyFromCamera && bAlbum.addEventListener('touchend', (e) => {
        plus.gallery.pick(
            (path) => {
                plus.barcode.scan(path, barcode.onmarked, barcode.onerror);
            },
            barcode.onerror
        );
    }, false);

    // 监听webview关闭，将相关控件都进行关闭
    webview.addEventListener("close", () => {
        barcode?.close();
        bFlashm?.close();
        bAlbum?.close();
    });

    // 扫码的成功回调：关闭webview，并执行success方法
    barcode.onmarked = async (type, code, file, charset) => {
        webview.close();
        await option.success(code);
    };
    barcode.onerror = async (error) => {
        webview.close();
        await option.fail(error);
    };

    // 将相关控件添加至webview中
    plus.webview.getWebviewById('webview').append(barcode)
    plus.webview.getWebviewById('webview').append(bFlash)
    !option.onlyFromCamera && plus.webview.getWebviewById('webview').append(bAlbum)

    // start
    barcode.start({
        vibrate: true
    })
}

调用

this.scanCode({
    onlyFromCamera: true,
    success: async (res) => {
        // do somthinig
    },
    fail(e) {
        uni.showToast({
            icon: "none",
            title: "扫码失败"
        })
    }
})

uni-app扫码

HTML5+ API Reference