Traditional Culture Encyclopedia - Traditional virtues - What is the diff algorithm?
What is the diff algorithm?
The diff algorithm is the algorithm used in virtual DOM.
Decompose the tree structure hierarchically and only compare elements at the same level.
Nodes at different levels only have creation and deletion operations.
Add a unique key attribute to each unit of the list structure to facilitate comparison.
Related information: React will only match components of the same class.
In the merge operation, when calling the component's setState method, React marks it as dirty.
At the end of each event loop, React checks all components marked dirty and redraws them.
Selective subtree rendering.
Developers can override shouldComponentUpdate to improve diff performance.
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