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Merge pull request vuejs#150 from iHelin/patch-1

partials部分翻译补充.md

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src/v2/guide
- migration.md

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`‎src/v2/guide/migration.md‎`

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Original file line number	Diff line number	Diff line change
@@ -1530,11 +1530,12 @@ el 选项不再在 `Vue.extend`中使用。仅在实例创建参数中可用。
`1530`	`1530`
`1531`	`1531`	### `Vue.partial` <sup>移除</sup>
`1532`	`1532`
`1533`		-Partials have been removed in favor of more explicit data flow between components, using props. Unless you're using a partial in a performance-critical area, the recommendation is to simply use a [normal component](components.html) instead. If you were dynamically binding the `name` of a partial, you can use a [dynamic component](components.html#Dynamic-Components).
	`1533`	+Partials 已被移除,取而代之的是更明确的组件之间的数据流--props。除非你正在使用一个部分性能关键型区域,否则建议只使用一个[normal component](components.html)来代替。如果你是动态绑定部分的`name`,您可以使用[dynamic component](components.html#Dynamic-Components)。
`1534`	`1534`
`1535`		-If you happen to be using partials in a performance-critical part of your app, then you should upgrade to [functional components](render-function.html#Functional-Components). They must be in a plain JS/JSX file (rather than in a `.vue` file) and are stateless and instanceless, just like partials. This makes rendering extremely fast.
`1536`	`1535`
`1537`		`-A benefit of functional components over partials is that they can be much more dynamic, because they grant you access to the full power of JavaScript. There is a cost to this power however. If you've never used a component framework with render functions before, they may take a bit longer to learn.`
	`1536`	+如果你碰巧在你的应用程序的性能关键部分使用`partials`,那么你应该升级到[functional components](render-function.html#Functional-Components)。它们必须在纯JS / JSX文件中(而不是在`.vue`文件中),并且是无状态的和无实例的,就像`partials`。这使得渲染极快。
	`1537`	`+`
	`1538`	+`functional components`相对于`partials`一个好处是它们可以更具动态性,因为它们允许您访问JavaScript的全部功能。然而,这是有成本的。如果你从来没有使用过渲染式的组件框架,你可能需要花费更长的时间来学习它们。
`1538`	`1539`
`1539`	`1540`
`1540`	`1541`	`{% raw %}`

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