/*
 * @Description: sessionStorage 封装
 * @Author: sql
 * @Date: 2018-11-23 21:02:16
 * @LastEditTime: 2018-11-27 17:25:50
 */
import crypt from "@/lib/crypt"

class SessionStorage {

  constructor() {
    this.Data = sessionStorage
  }

  // 获取 key中的数据
  Get(key, flag = false) {
    let res = null
    if (flag) {
      res = crypt.Decrypt(this.Data[key])
    } else {
      res = this.Data[key]

    }
    return this.IsExist(key) ? res : null
  }

  // 更新或创建新数据
  Set(key, val, flag = false) {
    let res = null
    if (flag) {
      res = crypt.Encrypt(String(val))
    } else {
      res = String(val)
    }
    this.Data[key] = sessionStorage[key] = res
  }

  // 输出 key 数据
  Del(key) {
    this.Data[key] = null
    sessionStorage.removeItem(key)
  }

  // key数据是否存在
  IsExist(key) {
    return this.Data.getItem(key) ? true : false
  }

  // 清除所有session
  Clear() {
    this.Data = null
    sessionStorage.clear()
  }
}

export default new SessionStorage