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变量的解构赋值
上面代码的第一个例子,等号左边的两个变量的次序,与等号右边两个同名属性的次序不一致,但是对取值完全没有影响。第二个例子的变量没有对应的同名属性,导致取不到值,最后等于 undefined。
GitHub
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33.V18特性篇-useMutableSource(已被取缔).md
说起外部数据源就要从 state 和更新说起 ,无论是 React 还是 Vue 这种传统 UI 框架中,虽然它们都采用虚拟 DOM 方式,但是还是不能够把更新单元委托到虚拟 DOM 身上来,所以更新的最小粒度还是在组件层面上,由组件统一管理数据 state,并参与调度更新。
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