[ 源代码： node-q ]
软件包：libjs-q（1.5.1-3）
JavaScript library for promises (CommonJS/Promises/A,B,D)
Q is a tool for creating and composing asynchronous promises in JavaScript.
If a function cannot return a value or throw an exception without blocking, it can return a promise instead. A promise is an object that represents the return value or the thrown exception that the function may eventually provide. A promise can also be used as a proxy for a remote object to overcome latency.
This package contains the q.js JavaScript library.