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更新了标题和部分错误
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src/guide/reactivity.md

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@@ -54,7 +54,7 @@ this.someObject = Object.assign({}, this.someObject, { a: 1, b: 2 })
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也有一些数组相关的问题,之前已经在[列表渲染](/guide/list.html#Caveats)中讲过。
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## 声明响应式属性
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由于 Vue 不允许动态添加顶级响应式属性,这意味着你必须初始化声明的所有顶级响应式前期数据属性,哪怕是有空值的实例:
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由于 Vue 不允许动态添加顶级响应式属性,这意味着你必须在前期,声明所有的顶级响应式数据属性,哪怕是有空值的实例:
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``` js
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var vm = new Vue({
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data: {

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