vue中 使用假的进度条数字插件：fake-progress

1.安装插件

npm install fake-progress

2.页面引用

在js中引用：import Fakeprogress from 'fake-progress'

3.定义

data() {
  return {
     fake: new Fakeprogress({
     timeConstant: 60000
     }),
   }
}

4.使用

在需要开始的地方使用：this.fake.start();

然后在需要放数字的地方使用：parseInt(fake.progress*100)

在需要结束的时候使用：this.fake.end();

5.使用示例

saveFile(data) {
      this.uploadVideoLoading = true;
      //开始进度条
      this.fake.start();
      var that = this;
      var mediaFile = data.file;
      var url = URL.createObjectURL(mediaFile);
      var showVideo = document.getElementById("test");
      var htmls = ' <video style="width:100%;height:100%;object-fit:fill;" id="video" muted="true" autoplay = "autoplay" controls> <source src="' + url + '">您的浏览器不支持 HTML5 video 元素。</video>';
      showVideo.innerHTML = htmls;
      var video_ = document.getElementById("video");
      //截取指定时间的图片作为封面图(第25秒)
      video_.currentTime = 1.000
      //截取视频封面图
      video_.addEventListener("loadeddata", function () {
          var canvas_ = document.getElementById("canvas_");
          canvas_.width = video_.clientWidth;
          canvas_.height = video_.clientHeight;
          canvas_.getContext("2d").drawImage(video_, 0, 0, canvas_.width, canvas_.height);
          var coverFile = that.dataURLtoFile(canvas_.toDataURL("image/png"), randomUUID() + ".png");
          const formDataCover = new FormData();
          formDataCover.append('file', coverFile);
          //上传视频
          const formDataVideo = new FormData();
          formDataVideo.append('file', mediaFile);
          postAction(that.url.fileUpload, formDataVideo).then((videoRes) => {
            that.uploading = false
            if (videoRes.success) {
              that.videoUrl = videoRes.message;
              //上传视频封面
              postAction(that.url.fileUpload, formDataCover).then((CorverRes) => {
                if (CorverRes.success) {
                  that.videoCover = CorverRes.message;
                   //结束进度条
                  that.fake.end();
                  that.uploadVideoLoading = false;
                }
              })
            }
          })