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Vue 中的 computed 、methods、watch 的区别 #89

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lovelmh13 opened this issue Jun 24, 2021 · 0 comments

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lovelmh13 commented Jun 24, 2021 •

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computed 是属性，具有缓存功能，不需要每次都计算；methods 是方法，每次需要执行函数来重新得到结果，即使值没有变化。
computed 可以拿到 data 的属性，但是 data 不能拿到 computed 的值，因为源码里 computed 在 data 之后生成。
computed 在DOM 加载后直接执行，methods 需要触发条件。
watch 监听的是已经在实例上的数据， computed 计算的是一个属性本身，这个属性就在 vue 实例上

https://zhuanlan.zhihu.com/p/55440112

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