// 视频类型列表
export const videoTypes = ['mp4', 'avi', 'rmvb', 'mov', 'wmv', 'flv', 'mkv'];

// 图片类型列表
export const imageTypes = ['jpg', 'png', 'gif', 'jpeg', 'bmp', 'webp'];

export const VIDEO = "video"; // 视频类型
export const IMAGE = "image";   // 图片类型
export const UNKNOWN = "unknown"; // 未知类型

/**
 * 判断指定url是图片还是视频
 */
export function getMediaType(url) {
  // 获取后缀名
  let from = url.lastIndexOf('.') + 1;
  let to = url.lastIndexOf('?');
  let suffix = url.substring(from, to > 0 ? to : url.length);
  if (videoTypes.indexOf(suffix) > -1) {
    return VIDEO;
  } else if (imageTypes.indexOf(suffix) > -1){
    return IMAGE;
  }
  return UNKNOWN;
}