在react中用装饰器来装饰connect

假设咱们在react中有以下header组件：

import React, { PureComponent } from 'react';
import { connect } from 'react-redux';
import actions from './actions';
class Header extends PureComponent{
  render(){
    return (
      <div>这是个组件</div>
    )
  }
}

const mapStateToProps = state => ({
  todos:state.todos
})

const mapDispatchToProps = dispatch => ({
  setTodos:value=>dispatch(actions.setTodos(value))
})

export default connect(mapStateToProps,mapDispatchToProps)(Header)

咱们在写react组件时结合redux要定义mapStateToProps和mapDispatchToProps两个返回对象的纯函数以便交给connect去包裹使用 具体connect使用查看connect

这里咱们就能够用装饰器(Decorator)来改写下:

import React, { PureComponent } from 'react';
import { connect } from 'react-redux';
import actions from './actions';

@connect(
  state=>({
    todos:state.todos
  }),
  dispatch=>({
    setTodos:value=>dispatch(actions.setTodos(value))
  })
)
class Header extends PureComponent{
  render(){
    return (
      <div>这是个组件</div>
    )
  }
}

export default Header

如此，改造完成，代码看上去也比改造前的干净整洁了

可是因为装饰器的兼容性问题咱们须要使用babel来转换

// 安装babel插件
yarn add @babel/plugin-proposal-decorators

修改package.json下的babel

"babel": {
  "presets": [
    "react-app"
  ],
  "plugins": [
    [
      "@babel/plugin-proposal-decorators",
      {
        "legacy": true
      }
    ]
  ]
},

最后一步
根目录下新建jsconfig.json解决编辑器报错问题

{
  "compilerOptions": {
    "experimentalDecorators": true
  }
}

而后就能够愉快的coding了