[ 源代码： node-d3-queue ]
软件包：node-d3-queue（3.0.7-3）
Evaluate asynchronous tasks with configurable concurrency
A queue evaluates zero or more deferred asynchronous tasks with configurable concurrency: you control how many tasks run at the same time. When all the tasks complete, or an error occurs, the queue passes the results to your await callback.
This library is similar to Async.js’s parallel (when *concurrency* is infinite) , series (when *concurrency* is 1), and queue, but features a much smaller footprint: as of release 2, d3-queue is about 700 bytes gzipped, compared to 4,300 for Async.
Node.js is an event-based server-side JavaScript engine.