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产品提了这样一个需求：
移动端拍照上传后图片不保存在用户设备上，试了好几种方法，uni-file-picker、uni.chooseImage、input type=‘file’，安卓手机都会默认把图片保存在手机，于是各种查资料，找到了以下方法，已验证可行。

1、获取摄像头权限并显示视频流：‌
使用navigator.mediaDevices.getUserMedia()获取摄像头权限，‌并将视频流显示在video标签中。‌
2、拍照：‌
使用HTML的canvas标签来截取当前摄像头的画面，‌并将其转换为图片格式。‌
3、上传图片：‌
使用uniapp的uni.uploadFile()方法将图片上传到服务器。‌

<view class="container"><button @click="initCamera">打开摄像头</button><button @click="takePhoto">拍照</button>
</view>
data() {return {stream: null,videoElement: null}}
mounted() {this.createVideoElement()
},methods: {createVideoElement() {// 一定要用createElement创建 video和canvas 元素，否则用不了其中的方法this.videoElement = document.createElement('video')this.videoElement.setAttribute('autoplay', '')this.videoElement.setAttribute('muted', '')this.videoElement.setAttribute('playsinline', '')// 添加到 DOM 中const container = document.querySelector('.container')container.appendChild(this.videoElement)},async initCamera() {if (this.stream) {this.stopCamera()}try {const constraints = { video: { facingMode: 'environment' }}const stream = await navigator.mediaDevices.getUserMedia(constraints)this.stream = streamthis.videoElement.srcObject = stream} catch (error) {console.error('Error accessing camera:', error)}},// 关闭摄像头stopCamera() {if (this.stream) {this.stream.getTracks().forEach(track => track.stop())this.stream = nullthis.videoElement.srcObject = null}},takePhoto() {this.captureImage()this.stopCamera()},async captureImage() {const canvas = document.createElement('canvas')canvas.width = this.videoElement.clientWidthcanvas.height = this.videoElement.clientHeightconst ctx = canvas.getContext('2d')ctx.drawImage(this.videoElement, 0, 0, canvas.width, canvas.height)// 转化成base64的编码格式const dataUrl = canvas.toDataURL('image/jpeg')this._uploadFileBase64(dataUrl)},// 上传到远程地址_uploadFileBase64(imgUrl) {uploadFileBase64(imgUrl).then(response => {if (response && response.SavePath) {console.log(response.SavePath)this.$uniToast('上传成功')} else {this.$uniToast('上传失败')}})}
}