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fix spell error #149

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fix spell error #149

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2 changes: 1 addition & 1 deletion docs/v2/reactive/index.md
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Expand Up @@ -27,7 +27,7 @@ var app = new Vue({
```
当我们去修改 `this.message` 的时候，模板对应的插值也会渲染成新的数据，那么这一切是怎么做到的呢？

在分析前，我们先直观的想一下，如果不用 Vue 的话，我们会通过最简单的方法实现这个需求：监听点击事件，修改数据，手动操作 DOM 重新渲染。这个过程和使用 Vue 的最大区别就是多了一步“手动操作 DOM 重新渲染”。这一步看上去并不多，但它背后又潜在的几个要处理的问题：
在分析前，我们先直观的想一下，如果不用 Vue 的话，我们会通过最简单的方法实现这个需求：监听点击事件，修改数据，手动操作 DOM 重新渲染。这个过程和使用 Vue 的最大区别就是多了一步“手动操作 DOM 重新渲染”。这一步看上去并不多，但它背后有潜在的几个要处理的问题：

1. 我需要修改哪块的 DOM？

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