记录--h5端调用手机摄像头实现扫一扫功能

html结构
<view class="reader-box" v-if="isScaning">
	<view class="reader" id="reader"></view>
</view>

所用数据
data(){
    return{
        html5Qrcode: null,
        isScaning: false,
    }
}

methods方法
openQrcode() {
    this.isScaning = true;
    Html5Qrcode.getCameras().then((devices) => {
    if (devices && devices.length) {
    this.html5Qrcode = new Html5Qrcode('reader');
    this.html5Qrcode.start(
        {
        facingMode: 'environment'
        },
        {
        focusMode: 'continuous', //设置连续聚焦模式
        fps: 5,       //设置扫码识别速度
        qrbox: 280   //设置二维码扫描框大小
        },
        (decodeText, decodeResult) => {
         if (decodeText) {	//这里decodeText就是通过扫描二维码得到的内容
            this.action(decodeText)  //对二维码逻辑处理
            this.stopScan(); //关闭扫码功能
        }
    },
        (err) => {
            // console.log(err);  //错误信息
         }
     );
    }
    });
},

stopScan() {
	console.log('停止扫码')
	this.isScaning = false;
	if(this.html5Qrcode){
    this.html5Qrcode.stop();
	}
}

css样式
.reader-box {
		position: fixed;
		top: 0;
		bottom: 0;
		left: 0;
		right: 0;
		background-color: rgba(0, 0, 0, 0.5);
	}

	.reader {
		width:100%;
		// width: 540rpx;
		// height: 540rpx;
		position: absolute;
		top: 50%;
		left: 50%;
		transform: translate(-50%, -50%);
	}