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next / express / next-routes
redux / react-redux / next-redux-wrapper / redux-thunk / redux-logger
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用于管理并发任务
用于管理并发任务
通过push方法往任务队列（waitList）推入任务
如果执行中的任务数量（aRunning）不超过最大同时执行任务数（concurrency），则立即调用go方法
在go方法中，会不断从waitList中获取任务并执行，如果已经满了（this.aRunning.length ===this.thread）就等待
另外push方法经过promise封装，如果推入的任务得到执行，则会被resolve或reject
详细文档见：
