HTML5 Local Storage with Expiration

localStorage.js

AZHU.storage = {
	save : function(key, jsonData, expirationMin){
		if (!Modernizr.localstorage){return false;}
		var expirationMS = expirationMin * 60 * 1000;
		var record = {value: JSON.stringify(jsonData), timestamp: new Date().getTime() + expirationMS}
		localStorage.setItem(key, JSON.stringify(record));
		return jsonData;
	},
	load : function(key){
		if (!Modernizr.localstorage){return false;}
		var record = JSON.parse(localStorage.getItem(key));
		if (!record){return false;}
		// 没有超期返回保存的数据，如果超了返回false
		return (new Date().getTime() < record.timestamp && JSON.parse(record.value));
	}
}

'use strict'

var LS = {
  setItem: function (key, value, expirationMin) {
    if (expirationMin) {
      const expirationMS = expirationMin * 60 * 1000
      const record = {value: JSON.stringify(value), timestamp: new Date().getTime() + expirationMS}
      return window.localStorage.setItem(key, record)
    } else {
      return window.localStorage.setItem(key, value)
    }
  },

  getItem: function (key) {
    const record = window.localStorage.getItem(key)
    if (!record) { return false }
    if (record.timestamp) {
      // 过期返回false, 没有过期返回数据
      return (new Date().getTime() < record.timestamp && JSON.parse(record.value))
    } else {
      return record
    }
  },

  removeItem: function (key) {
    return this.setItem(key, {})
  },

  clear: function () {
    window.localStorage.clear()
  }
}

module.exports = LS

另一个参考
支持localStorage设置过期时间功能的封装代码