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编辑当前文件:/home/freeclou/app.optimyar.com/backend/node_modules/brcast/index.js
export default function createBroadcast (initialState) { let listeners = {} let id = 0 let _state = initialState const getState = () => _state const setState = state => { _state = state const keys = Object.keys(listeners) for (let i = 0; i < keys.length; i += 1) { // if a listener gets unsubscribed during setState we just skip it if (typeof listeners[keys[i]] !== 'undefined') { listeners[keys[i]](state) } } } const subscribe = listener => { if (typeof listener !== 'function') { throw new Error('listener must be a function.') } const currentId = id let isSubscribed = true listeners[currentId] = listener id += 1 return function unsubscribe () { // in case unsubscribe gets called multiple times we simply return if (!isSubscribed) return isSubscribed = false delete listeners[currentId] } } return { getState, setState, subscribe } }