memoryStorage缓存

缺点

1. 刷新浏览器丢失
2. 重新加载页面丢失

const memoryStorage = {}
function get(key) {
    return memoryStorage[key]
}
function set(key, data) {
    memoryStorage[key] = data
}
function keys(callback) {
    return Object.keys(memoryStorage)
}
function remove(key) {
    delete memoryStorage[key]
}
function clear(key) {
    memoryStorage = {}
}
export default {
    name: 'memoryStorage',
    get,
  set,
  keys,
  clear,
  remove
}