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为列表渲染设置key属性
源码的patch过程中,会执行patchVnode,patchVnode过程中会执行updateChildren()方法更新新旧子元素,在这过程中通过key可以精准的判断当前两个元素节点是不是同一个节点。
结论:
key的作用主要是为了高效的更新虚拟DOM,其原理是vue在patch过程中通过key可以精准判断两个节点是否是同一个,从而避免频繁更新不同元素,使得整个patch过程更加高效,减少DOM操作量,提高性能。
另外,若不设置key还可能在列表更新时引发一些隐蔽的bug vue中在使用相同标签名元素的过渡transition切换时,也会用到key属性,其目的也是为了让vue可以区分他们,否则vue只会替换其内部属性而不会触发动画的过渡效果
The text was updated successfully, but these errors were encountered:
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为列表渲染设置key属性
源码的patch过程中,会执行patchVnode,patchVnode过程中会执行updateChildren()方法更新新旧子元素,在这过程中通过key可以精准的判断当前两个元素节点是不是同一个节点。
结论:
key的作用主要是为了高效的更新虚拟DOM,其原理是vue在patch过程中通过key可以精准判断两个节点是否是同一个,从而避免频繁更新不同元素,使得整个patch过程更加高效,减少DOM操作量,提高性能。
The text was updated successfully, but these errors were encountered: