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154.[vue]Vue 中v-if和v-for哪个优先级高？如果两个同时出现，应该怎么优化得到更好的性能？ #154

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webVueBlog opened this issue Apr 2, 2020 · 1 comment

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webVueBlog commented Apr 2, 2020

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webVueBlog commented Apr 2, 2020

处于同一节点时，v-for优先级更高，v-if会执行在每个循环中。
两个同时出现时分两种情况：
1:需要对数组里每一个元素进行判断，此时应使用计算属性，得到所有符合条件的元素数组，然后用v-for遍历新数组
2:需要根据条件跳过循环，此时应该将v-if置于外层元素（或）上

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