export function isObject (val) {
 return val !== null && typeof val === 'object'
}
export function setStore (key, val, type = 'localStorage') {
 if (isObject(val)) window[type].setItem(key, JSON.stringify(val))
 else window[type].setItem(key, val)
}
export function getStore (key, type = 'localStorage') {
 var val = window[type].getItem(key)
 try {
 return JSON.parse(val)
 } catch (e) {
 return val
 }
}
export function setSessionStore (key, val) {
 setStore(key, val, 'sessionStorage')
}
export function getSessionStore (key) {
 return getStore(key)
}
// 默认30minute
export function setExpireStore (key, val, ex = 1.8e6) {
 setStore(key, {v: val, t: Date.now() + ex})
}
export function getExpireStore (key) {
 var obj = getStore(key)
 if (obj.t > Date.now()) return obj.v
 else return false
}
export default {
 isObject,
 setStore,
 getStore,
 setSessionStore,
 getSessionStore,
 setExpireStore,
 getExpireStore
}