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了未定義試圖訪問this.props.state值無法訪問陣營的終極版MapStateToProps修改道具
import React, { Component, PropTypes } from 'react';
import { connect } from 'react-redux';
import * as actions from '../actions';
const mapStateToProps = ({ movies }) => ({
state: movies,
});
class App extends Component {
componentDidMount() {
this.props.addMovie({ title: 'Movie' }); //redux action
}
render() {
const { state } = this.props;
console.log(state.test); //Object {title: "Movie"}
console.log(state.test.title); //Uncaught TypeError: Cannot read property 'title' of undefined
return (
<div>Hello {state.test.title}!</div> //doesn't work
);
}
}
export default connect(mapStateToProps, actions)(App);
後Redux的完成組件的道具
我可以從Chrome的DevTools $r.props.state.test.title
訪問它,但不能從渲染功能
訪問它爲電子商務xample我可以從this.props.params.movieID
得到值,但不能得到任何修改的參數mapStateToProps
如何將this.props.state.test.title
值放入我的div中?
你可以粘貼實際的錯誤,你究竟得到了什麼樣的未定義? – Daniel