javascript - mapStateToProps 和变量未定义 React-Redux

Question

我收到这个错误:

./src/components/Playing.jsx Line 15: 'aaa' is not defined no-undef

在我的 Playing.jsx 中:

import React, { Component } from 'react'

console.log(aaa);

来 self 的 Token.jsx

import { connect } from 'react-redux'
imports { Playing } from '../components/Playing'

const mapStateToProps = state => ({
  aaa: "asdf"
})

export default connect(mapStateToProps)(Playing)

Answer 1

您不能只在文件中的任何地方console.log()；它需要在 Playing 组件的某些功能内；而且它也只能通过 props 获得，例如

class Playing extends React.Component {
  componentDidMount() {
    console.log(this.props.aaa);
  }

  render() {
    return <span>Playing</span>;
  }
}