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Update state-management.md #2 (#2488)
use `var` consistently. previous PR was using `const`, it should be using `var`. ref: vuejs/v2.vuejs.org#2486 (comment)
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src/v2/guide/state-management.md

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经常被忽略的是,Vue 应用中原始 `data` 对象的实际来源——当访问数据对象时,一个 Vue 实例只是简单的代理访问。所以,如果你有一处需要被多个实例间共享的状态,可以简单地通过维护一份数据来实现共享:
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``` js
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const sourceOfTruth = {}
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var sourceOfTruth = {}
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const vmA = new Vue({
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var vmA = new Vue({
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data: sourceOfTruth
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})
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const vmB = new Vue({
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var vmB = new Vue({
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data: sourceOfTruth
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})
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```

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