const img2base64 = (img) => {
  const getBase64Image = (img) => {
    var canvas = document.createElement("canvas");
    canvas.width = img.width;
    canvas.height = img.height;
    var ctx = canvas.getContext("2d");
    ctx.drawImage(img, 0, 0, img.width, img.height);
    var ext = img.src.substring(img.src.lastIndexOf(".") + 1).toLowerCase();
    var dataURL = canvas.toDataURL("image/" + ext);
    return dataURL;
  };
  var image = new Image();
  image.src = img;
  image.setAttribute("crossOrigin", "anonymous"); //允许图片跨域请求、必须后台也允许
  image.onload = () => {
    var base64 = getBase64Image(image);
    console.log(base64);
  };
};

export default img2base64;