看vuejs源碼,這段代碼有點看不懂,請大佬幫忙釋義一下,謝謝!代碼在Vue.js v2.5.16源碼的第7653-7661行var startClass = isAppear && appearClass? appearClass
: enterClass;var activeClass = isAppear && appearActiveClass? appearActiveClass
: enterActiveClass;var toClass = isAppear && appearToClass? appearToClass
: enterToClass;這里的isAppear是什么含義?這段三元操作符的代碼整體的是實現(xiàn)什么樣的功能?
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