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並前往https://docs.sencha.com/extjs/6.5.0/modern/Ext.data.NodeInterface.html

Ext.data.NodeInterface | Ext JS 6.5.0 - Sencha Documentation

Ext JS Modern - API documentation from Sencha. ... firstChild : Ext.data. ... A reference to this node's first child node. null if this node has no children ...

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