/**
 * 判断类型
 * @param params 
 */
export const getClass = (params: unknown): string | null => {
  const str = Object.prototype.toString.call(params);
  const matchResult = /^\[object (.*)\]$/.exec(str);
  if (matchResult !== null) {
    return matchResult[1].toLowerCase();
  }
  return null;
}