<template>
<div>
<!--canvas截取流-->
<canvas ref="canvas" width="320" height="260"></canvas>
<!--图片展示-->
<video ref="video" width="340" height="280" autoplay></video>
<!--确认-->
<el-button size="mini" type="primary" @click="photograph">拍照</el-button>
</div>
</template>
<script>
export default {
created() {
this.callCamera()
},
data() {
return {
// headImgSrc: require('../assets/image/shou.png')
}
},
methods: {
// 调用摄像头
callCamera() {
// H5调用电脑摄像头API
navigator.mediaDevices
.getUserMedia({
video: true
})
.then(success => {
// 摄像头开启成功
this.$refs['video'].srcObject = success
// 实时拍照效果
this.$refs['video'].play()
})
.catch(error => {
console.error('摄像头开启失败，请检查摄像头是否可用！')
})
},
// 拍照
photograph() {
let ctx = this.$refs['canvas'].getContext('2d')
// 把当前视频帧内容渲染到canvas上
ctx.drawImage(this.$refs['video'], 0, 0, 340, 280)
// 转base64格式、图片格式转换、图片质量压缩
let imgBase64 = this.$refs['canvas'].toDataURL('image/jpeg', 0.7) // 由字节转换为KB 判断大小
let str = imgBase64.replace('data:image/jpeg;base64,', '')
let strLength = str.length
let fileLength = parseInt(strLength - (strLength / 8) * 2) // 图片尺寸 用于判断
let size = (fileLength / 1024).toFixed(2)
console.log(size) // 上传拍照信息 调用接口上传图片 .........
// 保存到本地
// let ADOM = document.createElement('a')
// ADOM.href = this.headImgSrc
// ADOM.download = new Date().getTime() + '.jpeg'
// ADOM.click()
},
// 关闭摄像头
closeCamera() {
if (!this.$refs['video'].srcObject) return
let stream = this.$refs['video'].srcObject
let tracks = stream.getTracks()
tracks.forEach(track => {
track.stop()
})
this.$refs['video'].srcObject = null
}
}
}
</script>