React錯誤收集

1.  Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports

這個錯誤，最多見的問題是import組件出錯。例如，

import { com } from 't-com'  
//寫成了  
import com from 't-com'

或者

import com from 't-com'  
//寫成了  
import { com } from 't-com'