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docs(props): correct a wrong sentence (#1018)
* docs(props): correct a wrong sentence. update `props.md` watch prop * update * update
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src/guide/components/props.md

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@@ -166,7 +166,7 @@ watch(foo, /* ... */)
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这并不会按预期工作,因为它等价于 `watch(props.foo, ...)`——我们给 `watch` 传递的是一个值而不是响应式数据源。实际上,Vue 的编译器会捕捉这种情况并发出警告。
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与我们可以使用 `watch(() => props.foo, ...)` 侦听普通 prop 类似,我们也可以通过将其包装在 getter 中来侦听解构的 prop:
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与使用 `watch(() => props.foo, ...)`来侦听普通 prop 类似,我们也可以通过将其包装在 getter 中来侦听解构的 prop:
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```js
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watch(() => foo, /* ... */)

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