official documents have only two options for selecting any level, except that all nodes can choose and only the last level can be selected. Is there a way to customize which nodes can choose which can"t 
official documents have only two options for selecting any level, except that all nodes can choose and only the last level can be selected. Is there a way to customize which nodes can choose which can"t
seems to be impossible, of course, you can also customize
I don't understand what you mean, but the official document has written very clearly, if you want to make which option is not optional, just add the option "disabled: true,", and add the {value: 'yizhi',label:' consistent', disabled: true} at that level. This is the way to write it. This method is used whether it is the first-level option or the second-level option or the third-level option. I don't know if that's what you think.
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