there is no problem with the writing of the parent component and the child component. Print it out, and the length of the method in the child component is empty
there is no problem with the writing of the parent component and the child component. Print it out, and the length of the method in the child component is empty
do you want to call this Synchronousdata () method? The length of a function is determined by the number of parameters. Does your function have parameters?
if you want to call this method, you can:
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what does the code circled in the following picture mean? ...
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