The cascade selector selects multiple selection{ Multiple: true} and any one level option {checkstrict: true} will be invalid when you click 
, and an error will be reported as follows
Cascade selection has strict requirements on data. Each data item contains at least two items: value and label, and the subset is children </ Font> the data styles provided on the official website are as follows:
Here is my data on the console
When I change the value of value from int type to string type, I will not report an error. See the figure below for details.
The simplest way is + “, when any type is added to string, it will be converted to string first
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