Vue实现网页在线拍照和上传

项目背景：

用 vue-cli + element-ui 开发的项目

方法一（不支持360兼容模式、IE）：使用 mediaDevices.getUserMedia()

代码如下：

<template>
  <div class="take-photo">
    <!-- 拍照 -->
    <video id="videoCamera" :width="videoWidth" :height="videoHeight" autoPlay></video>
    <el-button size="small" type="primary" @click="takePhotoHandle">拍照</el-button>
    <!-- 预览 -->
    <canvas id="canvasCamera" :width="videoWidth" :height="videoHeight"></canvas>
    <el-button size="small" type="primary" :loading="loading" @click="uploadHandle">上传</el-button>
  </div>
</template>

<script>
export default {
  name: 'takePhoto',
  data () {
    return {
      loading: false, // 上传照片的loading
      imgSrc: "", // 照片地址
      photoVideo: null, // 拍照框
      photoContext: null, // canvas绘图环境
      photoCancas: null, // 预览框
      videoWidth: 306, // 拍照框宽度
      videoHeight: 378, // 拍照框高度
    }
  },
  mounted () {
    // 打开摄像头
    this.openCamera()
  },
  beforeDestroy() {
    if (this.photoVideo && this.photoVideo.srcObject) {
      // 停止视频流
      this.photoVideo.srcObject.getTracks()[0].stop();
    }
  },
  methods: {
    // 拍照处理
    takePhotoHandle () {
      // canvas画图
      this.photoContext.drawImage(this.photoVideo, 0, 0, this.videoWidth, this.videoHeight)
      // 获取图片base64链接
      this.imgSrc = this.photoCancas.toDataURL('image/png')
    },
    // 打开摄像头
    async openCamera() {
      this.photoVideo = document.getElementById('videoCamera')
      this.photoCancas = document.getElementById('canvasCamera')
      this.photoContext = this.photoCancas.getContext('2d')
      try {
        const constraints = {
          audio: false,
          video: {
            width: this.videoWidth,
            height: this.videoHeight
          }
        }
        const stream = await navigator.mediaDevices.getUserMedia(constraints)
        this.photoVideo.srcObject = stream
        this.photoVideo.play()
      } catch (error) {
        this.$message({
          title: '警告',
          message: '请确认摄像头能正常工作，必须使用谷歌浏览器或者360浏览器的极速模式，否则拍照不能正常使用',
          type: 'warning',
          duration: 8000
        });
      }
    },
    // 上传照片
    async uploadHandle () {
      this.loading = true
      try {
        const firstIndex = this.imgSrc.indexOf('base64,')
        const url = this.imgSrc.substr(firstIndex + 7)
        const params = {
          photo: url
        }
        // 发送接口
        await xxx(params)
        this.loading = false
      } catch (error) {
        this.loading = false
      }
    }
  }
}
</script>

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

方法二（兼容360兼容模式、IE）：使用 webcamjs

实现步骤：

1、安装适合浏览器的flash：https://www.flash.cn/download-wins

为了兼容IE，我下载的是下图版本：

2、将 webcam.min.js 和 webcam.swf 文件，放到根目录——>public目录中。

这两个文件可以在 webcamjs的github上拿到：https://github.com/jhuckaby/webcamjs

3、public目录下的index.html，在头部引入 webcam.min.js。

4、takePhoto.vue是拍照页，其中代码如下：

 <template>
   <div class="take-photo">
     <!-- 拍照 -->
     <div id="photoCamera"></div>
     <el-button size="small" type="primary" @click="takePhotoHandle">拍照</el-button>
     <!-- 预览 -->
     <div id="imageCamera"></div>
     <el-button size="small" type="primary" :loading="loading" @click="uploadHandle">上传</el-button>
   </div>
 </template>
 
 <script>
 export default {
   name: 'takePhoto',
   data () {
     return {
       loading: false, // 上传照片的loading
       imgSrc: "",
       videoWidth: 306,
       videoHeight: 378,
     }
   },
   mounted () {
     Webcam.set({
       width: this.videoWidth,
       height: this.videoHeight,
       image_format: 'jpeg',
       jpeg_quality: 100,
       swfURL: '../../webcam.swf', // 指定swf文件
     })
     Webcam.attach('#photoCamera')
   },
   methods: {
     // 拍照处理
     takePhotoHandle () {
       Webcam.snap(url => {
         this.imgSrc = url
         document.getElementById('imageCamera').innerHTML = `<img src="${url}">`
       })
     },
     // 上传照片
     async uploadHandle () {
       this.loading = true
       try {
         const firstIndex = this.imgSrc.indexOf('base64,')
         const url = this.imgSrc.substr(firstIndex + 7)
         const params = {
           photo: url
         }
         // 调接口
         await xxx(params)
         this.loading = false
       } catch (error) {
         this.loading = false
       }
     },
   }
 }
 </script>
 
 <style lang="scss" scoped>
 </style>