good-storage 是一个插件，需要安装
 
localStorage 临时缓存（主动清除缓存才会销毁）
 
sessionStorage 长期缓存（关闭浏览器自动销毁）
 
安装步骤：
 
在命令行安装
 
npm install good-storage
使用：
 
import storage from 'good-storage'
 
 // localStorage
 storage.set(key,val) 
 
 storage.get(key, def)
 
 // sessionStorage
 storage.session.set(key, val)
 
 storage.session.get(key, val)
缓存的API
 
set(key, val)
set storage with key and val
 
get(key, def)
get storage with key, return def if not find
 
remove(key)
remove storage with key
 
has(key)
determine storage has the key
 
clear()
clear all storages
 
getAll()
get all the storages
 
forEach(callback)
forEach the storages and call the callback function with each storage
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