Question

在运行此代码时，我在App.propTypes

的第一行收到错误

TypeError：无法读取属性＆＃39;数组＆＃39;未定义的

代码：

  class App extends React.Component {
   render() {
      return (
         <div>
            <h3>Array: {this.props.propArray}</h3>
            <h3>Array: {this.props.propBool ? "true" : "false"}</h3>
            <h3>Func: {this.props.propFunc(3)}</h3>
            <h3>Number: {this.props.propNumber}</h3>
            <h3>String: {this.props.propString}</h3>
            <h3>Object: {this.props.propObject.objectName1}</h3>
            <h3>Object: {this.props.propObject.objectName2}</h3>
            <h3>Object: {this.props.propObject.objectName3}</h3>
         </div>
      );
   }
}


App.propTypes = {
   propArray: React.PropTypes.array.isRequired, //I got error over here
   propBool: React.PropTypes.bool.isRequired,
   propFunc: React.PropTypes.func,
   propNumber: React.PropTypes.number,
   propString: React.PropTypes.string,
   propObject: React.PropTypes.object
}

App.defaultProps = {
   propArray: [1,2,3,4,5],
   propBool: true,
   propFunc: function(e){return e},
   propNumber: 1,
   propString: "String value...",

   propObject: {
      objectName1:"objectValue1",
      objectName2: "objectValue2",
      objectName3: "objectValue3"
   }
}

我试图搜索，但我没有得到正确的解决方案。

Answer 1

Prop-Types现在是一个名为prop-types的单独维护的库以下是来自react-docs的解释：https://reactjs.org/docs/typechecking-with-proptypes.html

您必须将其导入为

import React from 'react';
import PropTypes from 'prop-types'

class App extends React.Component {
  //App here
}

App.propTypes = {
 propArray: PropTypes.array.isRequired, 
 propBool: PropTypes.bool.isRequired,
 propFunc: PropTypes.func,
 propNumber: PropTypes.number,
 propString: PropTypes.string,
 propObject: PropTypes.object
}

NPM Package

Answer 2

更改此：

App.propTypes = {
   propArray: React.PropTypes.array.isRequired, //I got error over here
   propBool: React.PropTypes.bool.isRequired,
   propFunc: React.PropTypes.func,
   propNumber: React.PropTypes.number,
   propString: React.PropTypes.string,
   propObject: React.PropTypes.object
}

收件人：

App.propTypes = {
  propArray: PropTypes.array.isRequired,
  propBool: PropTypes.bool.isRequired,
  propFunc: PropTypes.func,
  propNumber: PropTypes.number,
  propString: PropTypes.string,
  propObject: PropTypes.object
}`

Answer 3

React包不再包含PropTypes。您需要安装prop-types包和

import PropTypes from 'prop-types';

编辑：如documentation

中的第一段所述

自React v15.5起，React.PropTypes已移至另一个包中。请改用prop-types库。

Answer 4

您应将React.PropTypes.array。*更改为PropTypes.array。*

App.propTypes = {
   propArray: PropTypes.array.isRequired,
   propBool: PropTypes.bool.isRequired,
   propFunc: PropTypes.func,
   propNumber: PropTypes.number,
   propString: PropTypes.string,
   propObject: PropTypes.object,
	 headerProp: PropTypes.string,
	 contentProp: PropTypes.string
}
App.defaultProps = {
		headerProp: "Header from props...",
		contentProp:"Content from props...",
		propArray: [1,2,3,4,5],
		propBool: true,
		propFunc: function(e){return e},
		propNumber: 1,
		propString: "String value...",

		propObject: {
			objectName1:"objectValue1",
			objectName2: "objectValue2",
			objectName3: "objectValue3"
		}
}

ReactJS＆＃34; TypeError：无法读取属性＆＃39; array＆＃39;未定义＆＃34;

4 个答案: