Vue人脸识别登陆

项目需求做登陆页面，先是准考证号，然后人脸识别验证匹配登陆！

因为要判断有没有人脸，没有人脸的话就不会拍照对比，所以这里主要用到的是tracking.js,在组建中引入tracking.js和face-min.js(当然也可以npm安装)

/*
*template
*/
<el-button type="primary" :loading="forming" @click="formTable">确认</el-button>//准考证号确认按钮，点击后开始调用摄像头

<video width="375" height="290" autoplay playsinline ref="video" id="video" v-show="true"></video>
<canvas id="canvas" width="500" height="400" class="canvas" v-show="false"></canvas>

/*
*script
*/
export default{
   data(){
     return{
      submitBase:""//存储拍到的base64照片,作为接口参数
      videoEle: null,
      trackerTask: null,
      mediaStreamTrack: null
     }
   },
   methods:{
     formTable(){
        //flag是一个开关,不然tracking.js会不断的拍照
        let flag = true;
        let tracker = new window.tracking.ObjectTracker("face");
        tracker.setStepSize(2);
        //转头角度影响识别率
        tracker.setEdgesDensity(0, 13);
        tracker.setInitialScale(5);
        this.trackerTask = window.tracking.track("video", tracker, {
          camera: true
        });
        tracker.on("track", event => {
          if (event.data.length) {
            //有头像有头像执行
            //会一直拍照,所有这里加个锁
            if (flag) {
              let vm = this;
              let video = document.querySelector("video");
              let canvas1 = document.querySelector("canvas");
              let context1 = canvas1.getContext("2d");
              canvas1.setAttribute("width", video.videoWidth);
              canvas1.setAttribute("height", video.videoHeight);
              flag = false;
              let image = context1.drawImage(
                video,
                0,
                0,
                video.videoWidth,
                video.videoHeight
              );
              let getBase = canvas1.toDataURL("image/png", 1); //1表示质量(无损压缩)
              this.submitBase = getBase;
            //下面就是axios调用接口了
      }
   }
}