npm链接：https://www.npmjs.com/package/vue-cookies
npm install vue-cookies --saveimport Vue from 'Vue'
import VueCookies from 'vue-cookies'
Vue.use(VueCookies)this.$cookies.set(keyName, time) //return thisthis.$cookies.get(keyName) // return value this.$cookies.remove(keyName) // return false or true , warning： next version return this； use isKey(keyname) return true/false,please查看一个cookie是否存在（通过keyName）
this.$cookies.isKey(keyName) // return false or truethis.$cookies.keys() // return a array