var video = document.getElementById("videoElement"); //获取前台要截图的video对象
video.setAttribute('crossOrigin', 'anonymous') // 跨域处理
var canvas = window.canvas = document.createElement("canvas");
canvas.width = 500;
canvas.height = 300;
canvas.getContext('2d').drawImage(video, 0, 0,500,500); // 将当前视频图片渲染在画布上，图片大小和视频分辨率一致
var images = canvas.toDataURL("image/png"); //canvas的api中的toDataURL()保存图像[toDataUrl](https://developer.cdn.mozilla.net/zh-CN/docs/Web/API/HTMLCanvasElement/toDataURL)
var arr = images.split(','),
mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]),
n = bstr.length,
u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
var file = new File([u8arr], 'cutout.jpg', { type: mime });
let config = {headers: { 'Content-Type': 'multipart/form-data' }}
let formData = new FormData();
formData.append('multipart', file, file.name);
axios.post('http://127.0.0.1:8080/api/v1/workorder/operation/upload', formData, config)
.then(res => {})
