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docs(cn): translate content/warnings/special-props.md into Chinese (r…
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seognil authored and QC-L committed Mar 20, 2019
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---
title: Special Props Warning
title: 警告:特殊的 props
layout: single
permalink: warnings/special-props.html
---

Most props on a JSX element are passed on to the component, however, there are two special props (`ref` and `key`) which are used by React, and are thus not forwarded to the component.
大部分 JSX 元素上的 props 都会被传入组件,然而,有两个特殊的 props `ref` `key`) 已经被 React 所使用,因此不会被传入组件。

For instance, attempting to access `this.props.key` from a component (i.e., the render function or [propTypes](/docs/typechecking-with-proptypes.html#proptypes)) is not defined. If you need to access the same value within the child component, you should pass it as a different prop (ex: `<ListItemWrapper key={result.id} id={result.id} />`). While this may seem redundant, it's important to separate app logic from reconciling hints.
举个例子,在组件中试图获取 `this.props.key` (比如通过 render 函数或 [propTypes](/docs/typechecking-with-proptypes.html#proptypes)))将得到 undefined。如果你需要在子组件中获取相同的值,你应该用一个不同的 prop 来传入它(例如:`<ListItemWrapper key={result.id} id={result.id} />`)。虽然这似乎是多余的,但是将应用程序逻辑和协调提示(reconciliation hints)分开是很重要的。

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