Comet is a set of techniques providing low-latency data transit for the browser. The two most popular techniques, "forever-frame" and "long-polling", significantly reduce latency over Ajax polling.
Comet是一套为浏览器提供低延迟数据传输的技术集合，它的两个主要的技术是“ forever - frame ”和“ long - polling ”在相当大的程度上减少Ajax对服务端的多次数据检测查询。
How to reshape a data frame from wide to long format in r?
如何重塑一个数据框的长宽格式r ？
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