react源码教程（详解React 代码共享最佳实践方式）

const mixin = function (obj, mixins) {
  const newObj = obj
  newObj.prototype = Object.create(obj.prototype)

  for (let prop in mixins) {
    // 遍历mixins的属性
    if (mixins.hasOwnPrototype(prop)) {
      // 判断是否为mixin的自身属性
      newObj.prototype[prop] = mixins[prop]; // 赋值
    }
  }
  return newObj
};

const DefaultNameMixin = {
  getDefaultProps: function () {
    return {
      name: "Joy"
    }
  }
}

const ComponentOne = React.createClass({
  mixins: [DefaultNameMixin]
  render: function () {
    return <h2>Hello {this.props.name}</h2>
  }
})

const DefaultFriendMixin = {
  getDefaultProps: function () {
    return {
      friend: "Yummy"
    }
  }
}

const ComponentOne = React.createClass({
  mixins: [DefaultNameMixin, DefaultFriendMixin]
  render: function () {
    return (
      <li>
        <h2>Hello {this.props.name}</h2>
        <h2>This is my friend {this.props.friend}</h2>
      </li>
    )
  }
})

const DefaultPropsMixin = {
  mixins: [DefaultNameMixin, DefaultFriendMixin]
}

const ComponentOne = React.createClass({
  mixins: [DefaultPropsMixin]
  render: function () {
    return (
      <li>
        <h2>Hello {this.props.name}</h2>
        <h2>This is my friend {this.props.friend}</h2>
      </li>
    )
  }
})

const withRouter = (Component) => {
  const displayName = `withRouter(${Component.displayName || Component.name})`
  const C = props => {
    const { wrappedComponentRef, ...remainingProps } = props
    return (
      <RouterContext.Consumer>
        {context => {
          invariant(
            context,
            `You should not use <${displayName} /> outside a <Router>`
          );
          return (
            <Component
              {...remainingProps}
              {...context}
              ref={wrappedComponentRef}
            />
          )
        }}
      </RouterContext.Consumer>
    )
}

import React, { Component } from "react"
import { withRouter } from "react-router"
class TopHeader extends Component {
  render() {
    return (
      <li>
        导航栏
        {/* 点击跳转login */}
        <button onClick={this.exit}>退出</button>
      </li>
    )
  }

  exit = () => {
    // 经过withRouter高阶函数包裹，就可以使用this.props进行跳转操作
    this.props.history.push("/login")
  }
}
// 使用withRouter包裹组件，返回history,location等
export default withRouter(TopHeader)

import React, { Component } from 'react'

const widthSinging = WrappedComponent => {
	return class HOC extends Component {
		constructor () {
			super(...arguments)
			this.singing = this.singing.bind(this)
		}

		singing = () => {
			console.log('i am singing!')
		}

		render() {
			return <WrappedComponent />
		}
	}
}

import React, { Component } from 'react'

const widthDancing = WrappedComponent => {
	return class HOC extends Component {
		constructor () {
			super(...arguments)
			this.dancing = this.dancing.bind(this)
		}

		dancing = () => {
			console.log('i am dancing!')
		}

		render() {
			return <WrappedComponent />
		}
	}
}

import React, { Component } from "react"
import { widthSing, widthDancing } from "hocs"

class Joy extends Component {
  render() {
    return <li>Joy</li>
  }
}

// 给Joy赋能唱歌和跳舞的特长
export default widthSinging(withDancing(Joy))

<DataProvider render={(data) => <h1>Hello {data.target}</h1>} />

import { Modal, Button } from "antd"
class App extends React.Component {
  state = { visible: false }

  // 控制弹窗显示隐藏
  toggleModal = (visible) => {
    this.setState({ visible })
  };

  handleOk = (e) => {
    // 做点什么
    this.setState({ visible: false })
  }

  render() {
    const { visible } = this.state
    return (
      <li>
        <Button onClick={this.toggleModal.bind(this, true)}>Open</Button>
        <Modal
          title="Basic Modal"
          visible={visible}
          onOk={this.handleOk}
          onCancel={this.toggleModal.bind(this, false)}
        >
          <p>Some contents...</p>
        </Modal>
      </li>
    )
  }
}

<MyModal>
  <Button>Open</Button>
  <Modal title="Basic Modal" onOk={this.handleOk}>
    <p>Some contents...</p>
  </Modal>
</MyModal>

import { Modal, Button } from "antd"
class MyModal extends React.Component {
  state = { on: false }

  toggle = () => {
    this.setState({
      on: !this.state.on
    })
  }

  renderButton = (props) => <Button {...props} onClick={this.toggle} />

  renderModal = ({ onOK, ...rest }) => (
    <Modal
      {...rest}
      visible={this.state.on}
      onOk={() => {
        onOK && onOK()
        this.toggle()
      }}
      onCancel={this.toggle}
    />
  )

  render() {
    return this.props.children({
      Button: this.renderButton,
      Modal: this.renderModal
    })
  }
}

// 不好的示例
class MouseTracker extends React.Component {
  render() {
    return (
      <Mouse render={mouse => (
        <Cat mouse={mouse} />
      )}/>
    )
  }
}

// 好的示例
class MouseTracker extends React.Component {
  renderCat(mouse) {
  	return <Cat mouse={mouse} />
  }

  render() {
    return (
		  <Mouse render={this.renderTheCat} />
    )
  }
}

const MyComponent = () => {
  return (
    <Mouse>
      {({ x, y }) => (
        <Page>
          {({ x: pageX, y: pageY }) => (
            <Connection>
              {({ api }) => {
                // yikes
              }}
            </Connection>
          )}
        </Page>
      )}
    </Mouse>
  )
}

import React, { Component } from "react"

export default class Button extends Component {
  constructor() {
    super()
    this.state = { buttonText: "Click me, please" }
    this.handleClick = this.handleClick.bind(this)
  }
  handleClick() {
    this.setState(() => {
      return { buttonText: "Thanks, been clicked!" }
    })
  }
  render() {
    const { buttonText } = this.state
    return <button onClick={this.handleClick}>{buttonText}</button>
  }
}

import React, { useState } from "react"

export default function Button() {
  const [buttonText, setButtonText] = useState("Click me,   please")

  function handleClick() {
    return setButtonText("Thanks, been clicked!")
  }

  return <button onClick={handleClick}>{buttonText}</button>
}