Some easy to miss points
Original link: https://zburu.com/archives/158.html When listening to the object, if the value is null, an error will be reported, and the default value is set to {}; for in can only traverse the object i in 4 is a wrong way of writing; Dynamically obtain arrays – splicing parameters var arr = [ “单位1”, “单位2”, “单位3”, […]
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