// 添加一个video元素

(function(window){

        let video=document.createElement("video");

        video.src = "/storage/emulated/0/UZMap/A6097221144053/aliyunvod/1553142977717.mp4";

        // video.autoplay = true;

        video.id = "video";

        video.currentTime = 1;

        document.body.appendChild(video);

})();

// 绘制canvas画布、获取data

function getData(){

      let v = document.getElementById("video");

      let canvas=document.createElement("canvas");

      let ctx = canvas.getContext("2d");

      ctx.drawImage(v, 0, 0, 270, 135);

      // document.body.appendChild(canvas);

      console.log(canvas.toDataURL());

 }