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获取自 Unix 纪元(1970年1月1日00:00:00 UTC)以来经过的毫秒数的时间戳。
2.4.0
(数字):返回时间戳(timestamp)。
_.defer(function(stamp) { console.log(_.now() - stamp);}, _.now()); // => Logs the number of milliseconds it took for the deferred invocation.