<template>
    <div>
        <div @click="moveToCameraAVG()" v-cloak>
            <div class="warm_title2">点击扫码</div>
        </div>
    </div>
</template>

<script type="text/ecmascript-6">
export default {
    data () {
        return {
        }
    },
    methods: {
        // 头像相机
        moveToCameraAVG() {
            var self = this
            if (navigator.mediaDevices === undefined) {
                navigator.mediaDevices = {}
            }
            if (navigator.mediaDevices.getUserMedia === undefined) {
                navigator.mediaDevices.getUserMedia = function (constraints) {
                    var getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia || navigator.oGetUserMedia
                    if (!getUserMedia) {
                        return Promise.reject(new Error('getUserMedia is not implemented in this browser'))
                    }
                    return new Promise(function (resolve, reject) {
                        getUserMedia.call(navigator, constraints, resolve, reject)
                    })
                }
            }
            var constraints = window.constraints = {
                audio: false,
                video: {
                    sourceId: 'default',
                    facingMode: { exact: 'user' }
                }
            }
            navigator.mediaDevices.getUserMedia(constraints)
                .then(function (stream) {
                    var video = document.getElementById('video')
                    try {
                        window.stream = stream
                        video.srcObject = stream
                    } catch (error) {
                        video.src = window.URL.createObjectURL(stream)
                    }
                    self.localMediaStream = stream
                    video.play()
                })
                .catch(function (err) {
                    alert(err.name + ': ' + err.message)
                })
        },
    },

}
</script>

<style lang="scss"></style>

此代码须打包后在Hbuilder上
只有真机运行才能起作用
以上是我个人书写代码，仅供参考，欢迎指正