shuibei_share/utils/cache.js

import { EXPIRE } from "@/config/app";

class Cache {
  constructor(handler) {
    this.cacheSetHandler = uni.setStorageSync;
    this.cacheGetHandler = uni.getStorageSync;
    this.cacheClearHandler = uni.removeStorageSync;
    this.cacheExpire = "_expire_2019_12_17_18_44";
    this.name = "storage";
  }

  /**
   * 获取当前时间戳
   */
  time() {
    return Math.round(new Date() / 1000);
  }

  /**
   * 日期字符串转时间戳
   * @param {Object} expiresTime
   */
  strTotime(expiresTime) {
    let expires_time = expiresTime.substring(0, 19);
    expires_time = expires_time.replace(/-/g, "/");
    return Math.round(new Date(expires_time).getTime() / 1000);
  }

  setExpireCaheTag(key, expire) {
    expire = expire !== undefined ? expire : EXPIRE;
    if (typeof expire === "number") {
      let tag = this.cacheGetHandler(this.cacheExpire),
        newTag = [],
        newKeys = [];
      if (typeof tag === "object" && tag.length) {
        newTag = tag.map((item) => {
          newKeys.push(item.key);
          if (item.key === key) {
            item.expire = expire === 0 ? 0 : this.time() + expire;
          }
          return item;
        });
      }
      if (!newKeys.length || newKeys.indexOf(key) === -1) {
        newTag.push({
          key: key,
          expire: expire === 0 ? 0 : this.time() + expire,
        });
      }
      this.cacheSetHandler(this.cacheExpire, newTag);
    }
  }

  /**
   * 设置过期时间缓存
   * @param {Object} name key
   * @param {Object} value value
   * @param {Object} expire 过期时间
   * @param {Object} startTime 记录何时将值存入缓存，毫秒级
   */
  setItem(params) {
    let obj = {
      name: "",
      value: "",
      expires: "",
      startTime: new Date().getTime(),
    };
    let options = {};
    //将obj和传进来的params合并
    Object.assign(options, obj, params);
    if (options.expires) {
      //如果options.expires设置了的话
      //以options.name为key，options为值放进去
      // localStorage.setItem(options.name,JSON.stringify(options));
      uni.setStorageSync(options.name, JSON.stringify(options));
    } else {
      //如果options.expires没有设置，就判断一下value的类型
      let type = Object.prototype.toString.call(options.value);
      //如果value是对象或者数组对象的类型，就先用JSON.stringify转一下，再存进去
      if (Object.prototype.toString.call(options.value) == "[object Object]") {
        options.value = JSON.stringify(options.value);
      }
      if (Object.prototype.toString.call(options.value) == "[object Array]") {
        options.value = JSON.stringify(options.value);
      }
      // localStorage.setItem(options.name,options.value);
      uni.setStorageSync(options.name, options.value);
    }
  }

  /**
   * 缓存是否过期,过期自动删除
   * @param {Object} key
   * @param {Object} $bool true = 删除,false = 不删除
   */
  getExpireCahe(key, $bool) {
    try {
      let time = this.cacheGetHandler(key + this.cacheExpire);
      if (time) {
        let newTime = parseInt(time);
        if (time && time < this.time() && !Number.isNaN(newTime)) {
          if ($bool === undefined || $bool === true) {
            this.cacheClearHandler(key);
            this.cacheClearHandler(key + this.cacheExpire);
          }
          return false;
        } else return true;
      } else {
        return !!this.cacheGetHandler(key);
      }
    } catch (e) {
      return false;
    }
  }

  /**
   * 设置缓存
   * @param {Object} key
   * @param {Object} data
   */
  set(key, data, expire) {
    if (typeof data === "object") data = JSON.stringify(data);
    try {
      this.setExpireCaheTag(key, expire);
      return this.cacheSetHandler(key, data);
    } catch (e) {
      return false;
    }
  }

  /**
   * 检测缓存是否存在
   * @param {Object} key
   */
  has(key) {
    return this.getExpireCahe(key);
  }

  /**
   * 获取缓存
   * @param {Object} key
   * @param {Object} $default
   * @param {Object} expire
   */
  get(key, $default, expire) {
    try {
      let isBe = this.getExpireCahe(key);
      let data = this.cacheGetHandler(key);
      if (data && isBe) {
        if (typeof $default === "boolean") return JSON.parse(data);
        else return data;
      } else {
        if (typeof $default === "function") {
          let value = $default();
          this.set(key, value, expire);
          return value;
        } else {
          this.set(key, $default, expire);
          return $default;
        }
      }
    } catch (e) {
      return null;
    }
  }

  /**
   * 删除缓存
   * @param {Object} key
   */
  clear(key) {
    try {
      let cahceValue = this.cacheGetHandler(key + this.cacheExpire);
      if (cahceValue) this.cacheClearHandler(key + this.cacheExpire);
      return this.cacheClearHandler(key);
    } catch (e) {
      return false;
    }
  }

  /**
   * 清除过期缓存
   */
  clearOverdue() {
    // let cacheList = uni.getStorageInfoSync(),that = this;
    // if (typeof cacheList.keys === 'object'){
    // 	cacheList.keys.forEach(item=>{
    // 		that.getExpireCahe(item);
    // 	})
    // }
  }

  /**
   * 获取缓存，调用后无需转换数据类型
   * @param {Object} key
   */
  getItem(name) {
    // let item = localStorage.getItem(name);
    let item = uni.getStorageSync(name);
    //先将拿到的试着进行json转为对象的形式
    try {
      item = JSON.parse(item);
    } catch (error) {
      //如果不行就不是json的字符串，就直接返回
      item = item;
    }
    //如果有startTime的值，说明设置了失效时间
    if (item.startTime) {
      let date = new Date().getTime();
      //何时将值取出减去刚存入的时间，与item.expires比较，如果大于就是过期了，如果小于或等于就还没过期
      if (date - item.startTime > item.expires) {
        //缓存过期，清除缓存，返回false
        // localStorage.removeItem(name);
        uni.removeStorageSync(name);
        return false;
      } else {
        //缓存未过期，返回值
        return item.value;
      }
    } else {
      //如果没有设置失效时间，直接返回值
      return item;
    }
  }
}

export default new Cache();