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Vue 之keep-alive的使用，实现页面缓存
source link: https://juejin.im/post/5ddcefaef265da06113c6fa9
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什么是keep-alive 有时候我们不希望组件被重新渲染影响使用体验；或者处于性能考虑，避免多次重复渲染降低性能。而是希望组件可以缓存下来,维持当前的状态。这时候就需要用到keep-alive组件。 官网释义： <keep-alive> 包裹动态
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