- 报错: Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.
报这个错的原因是，创建了react组件之后没有使用export default对外暴露就在父组件中应用该，使用export default暴露出去就可以了哦！
2. 报错: takes an object of state variables to update or a function which returns an object of state variables
报错原因：在使用this.setState()方法是传入错误的参数，实力方法setState()方法只接收，需要更新的状态变量的对象，返回值是需更新状态变量的对象的函数和null，如果你闯入的参数都不是object, function ,null那么久会报这个错了
......持续更新中