prop-types react using data type detection props

First, why use prop-types

When people develop, when people use their own definition of the components, it is possible to pass the wrong type of situation, and on their components plus prop-types, he can check the parent component came props, adding parent components want to pass a string type '3', and sends a digital type 3, if there is no type checking system will not give tips, but after checking with the type, then the console will give you a type of delivery errors tips. So you can quickly find errors in their work.

Second, the study documents

https://www.npmjs.com/package/prop-types  npm official website
https://reactjs.org/docs/typechecking-with-proptypes.html  REACT official

Third, installation and introduction

//安装
npm install prop-types --save
//引入
import PropTypes from 'prop-types';

Fourth, it can detect the type of

optionalArray: PropTypes.array,
optionalBool: PropTypes.bool,
optionalFunc: PropTypes.func,
optionalNumber: PropTypes.number,
optionalObject: PropTypes.object,
optionalString: PropTypes.string,
optionalSymbol: PropTypes.symbol,

Fifth, the use isRequired must set the property value passed to

 static propTypes={
    name:PropTypes.string.isRequired
  }

Sixth, the use defaultProps

TodoItem.propTypes = {
     test:Proptypes.string.isRequired,
     item      : Proptypes.string,
     deleteItem: Proptypes.func,
     index     : Proptypes.number
}
TodoItem.defaultProps = {
     test:'hello'
}