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並前往https://coderedirect.com/questions/429413/how-to-programmatically-expand-or-collapse-tree-item-in-material-ui

How to programmatically expand or collapse Tree Item in ...

The code below expands the TreeItem with id "1" on mount. import React, {useEffect, useState} from 'react'; import TreeView from '@material-ui/lab/TreeView'; ...

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