JavaScript yana gudu akan **zafi guda", saboda haka yana iya yin aikin ɗaya ne a lokaci. event loop shine abin da ya bashi iya yin gaggawar asynchronous ba tare da katsewar ajiya ba: yana gudu call stack, kuma lokacin da stack ya zama fanila, yana ja callbacks daga cibiyoyi.
Akwai cibiya biyu masu nisbos daban-daban:
