EagerLoadingsection的第一句来自Laravel文档的是:WhenaccessingEloquentrelationshipsasproperties,therelationshipdatais"lazyloaded".Thismeanstherelationshipdataisnotactuallyloadeduntilyoufirstaccesstheproperty.在本节的最后一段中指出:Toloadarelationshiponlywhenithasnotalreadybeenloaded,usetheloadMissingmethod:publicfunct