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/**
* Created by supervisor on 2018/5/25.
*/
//定时 缓存
var MyLocalStorage ={
Cache : {
/**
* 总容量5M
* 存入缓存，支持字符串类型、json对象的存储
* 页面关闭后依然有效 ie7+都有效
* @param key 缓存key
* @param stringVal
* @time 数字 缓存有效时间（秒） 默认60s
* 注：localStorage 方法存储的数据没有时间限制。第二天、第二周或下一年之后，数据依然可用。不能控制缓存时间，故此扩展
* */
put : function(key,stringVal,time){
try{
if(!localStorage){return false;}
if(!time || isNaN(time)){time=60;}
var cacheExpireDate = (new Date()-1)+time*1000;
var cacheVal = {val:stringVal,exp:cacheExpireDate};
localStorage.setItem(key,JSON.stringify(cacheVal));//存入缓存值
//console.log(key+":存入缓存，"+new Date(cacheExpireDate)+"到期");
}catch(e){}
},
/**获取缓存*/
get : function (key){
try{
if(!localStorage){return false;}
var cacheVal = localStorage.getItem(key);
var result = JSON.parse(cacheVal);
var now = new Date()-1;
if(!result){return null;}//缓存不存在
if(now>result.exp){//缓存过期
this.remove(key);
return "";
}
//console.log("get cache:"+key);
return result.val;
}catch(e){
this.remove(key);
return null;
}
},/**移除缓存，一般情况不手动调用，缓存过期自动调用*/
remove : function(key){
if(!localStorage){return false;}
localStorage.removeItem(key);
},/**清空所有缓存*/
clear : function(){
if(!localStorage){return false;}
localStorage.clear();
}
}//end Cache
}
export default MyLocalStorage