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To scope styles, Vue adds a unique attribute to component elements, such as `data-v-f3f3eg9`. Then selectors are modified so that only matching elements with this attribute are selected (e.g. `button[data-v-f3f3eg9]`).
The problem is that large numbers of [element-attribute selectors](http://stevesouders.com/efws/css-selectors/csscreate.php?n=1000&sel=a%5Bhref%5D&body=background%3A+%23CFD&ne=1000) (e.g.`button[data-v-f3f3eg9]`) will be considerably slower than [class-attribute selectors](http://stevesouders.com/efws/css-selectors/csscreate.php?n=1000&sel=.class%5Bhref%5D&body=background%3A+%23CFD&ne=1000) (e.g.`.btn-close[data-v-f3f3eg9]`), so class selectors should be preferred whenever possible.
An ideal Vue application is props down, events up. Sticking to this convention makes your components much easier to understand. However, there are edge cases where prop mutation or `this.$parent`can simplify two components that are already deeply coupled.
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理想的な Vue アプリケーションは props down, events up です。 この規則に従うことで、コンポーネントはより理解しやすくなります。しかし、プロパティの変更と `this.$parent`が、すでに深く結合している2つのコンポーネントを単純化できるエッジケースも存在します。
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The problem is, there are also many _simple_ cases where these patterns may offer convenience. Beware: do not be seduced into trading simplicity (being able to understand the flow of your state) for short-term convenience (writing less code).
Managing state on `this.$root`and/or using a global event bus can be convenient for very simple cases, but it is not appropriate for most applications.
Vuex is the [official flux-like implementation](/guide/state-management.html#official-flux-like-implementation) for Vue, and offers not only a central place to manage state, but also tools for organizing, tracking, and debugging state changes. It integrates well in the Vue ecosystem (including full [Vue DevTools](/guide/installation.html#vue-devtools)support).
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