cckj-util/src/utils/file.js

A common util lib for cj

/**
 * UtilFile 文件操作
 */
class UtilFile {

  /**
   * 传入图片链接，返回base64数据
   * @static
   * @param {string} images 图片 src 地址
   * @param {function} callback 转化成 base64 后的回调
   */
  static getBase64Image(images, callback) {
    var img = new Image();
    img.src = images + "?time=" + Date.now();
    img.setAttribute("crossOrigin", "anonymous");

    img.onload = function () {
      let canvas = document.createElement("canvas");
      let width = img.width; //确保canvas的尺寸和图片一样
      let height = img.height;
      canvas.width = width;
      canvas.height = height;
      canvas.getContext("2d").drawImage(img, 0, 0, width, height);

      let dataURL = canvas.toDataURL(); //使用canvas获取图片的base64数据
      callback ? callback(dataURL) : null; //调用回调函数
    };
  }
}

export default UtilFile