react中的hoc和修饰器@connect结合使用
在学习react-redux的时候,看到了修饰器这个新的属性,这个是es7的提案属性,很方便。于是我用@connect代替了connect(使用的时候需要配置,这里不赘述),省去了很多不必要的代码,但是我的view层和代码逻辑层是分开的,即view+hoc的模式:
先看封装的connect:
import {bindActionCreators} from "redux"; import {connect} from "react-redux"; import * as paperActions from "../redux/actions/index" export default connect( state=>state, dispatch=>bindActionCreators(paperActions,dispatch) )
在view页面中引用:
import React, {Component} from "react" import connect from './../../containers/index'; @connect export default class Test extends Component { render() { return ( <div>......</div> ) } }
这个时候我们便已经取到了redux的action和state,那我所有的逻辑代码在hoc文件里面:
import React, {Component} from "react"; const getDisplayName = component => component.displayName || component.name || "Component"; const hoc = WrappedComponent => { return class extends Component { static displayName = `HOC(${getDisplayName(WrappedComponent)})`; // 构造 constructor(props) { super(props); } componentDidMount() { console.log(this.props); } render() { const props = { ...this.props, }; return <WrappedComponent {...props} /> } } }; export default hoc
此时打印出来“this.props”是得不到state和action的,然后我再hoc里面尝试了各种方法,却一直在报错:
Leading decorators must be attached to a class declaration
很明显,修饰器只能放在类的前面,于是谷歌了许多资料,发现其实hoc就是一个纯函数,可以当修饰器来使用,于是:
import React, {Component} from "react" import connect from './../../containers/index'; import hoc from "./hoc" @connect @hoc export default class Test extends Component { render() { return ( <div>......</div> ) } }
在hoc中就可以使用redux里面的actions和state了