text: /**
  * @Author: Yingya Zhang <zyy>
  * @Date:   2016-07-09 16:29:00
  * @Email:  zyy7259@gmail.com
  * @Last modified by:   zyy
  * @Last modified time: 2016-07-09 16:30:04
  */
  
  export * from './math'
  export const e = 2.71
  export default x => {
    return Math.exp(x)
  }
  