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你应该要知道的Vue.js
source link: https://juejin.im/post/5ab2ff496fb9a028c06ab78f
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原文：你应该要知道的Vue.js 组件data为什么必须是函数？ 因为组件可能被多处使用，但他们的data是私有的，所以每个组件都要return一个新的data对象 组件通信 父子组件通信：$on、$emit 非父子组件的通信: event bus 复杂情况
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