react结合typescript 封装组件实例详解

my-demo
  |—— node_modules
  |——	public
  |     └─ favicon.ico
  |     └─ index.html
  |     └─ manifest.json
	|—— src
	|		 └─ ...
  |─   .gitignore
  |─   package.json
  |─   package-lock.json
  |─   README.md
  └─   tsconfig.json //文件中指定了用来编译这个项目的根文件和编译选项

import React from 'react';
import ReactDOM from 'react-dom/client';
import Hello from './src/Hello'
const root = ReactDOM.createRoot(
  document.getElementById('root') as HTMLElement
);
root.render(
  <div>hellow TS</div>
);

import React form 'react'
//声明 Hello 组件 props 接口类型
interface BaseProps {
  message?:string //可选填 string 类型
}
const Hello:FunctionComponent<BaseProps> =(props) => {
    /*
      FunctionComponent<BaseProps> 接口，接收一个泛型
      	+ 使用 interface 定义的 BaseProps j接口作为泛型值
        + 组件还可以接收 props.chilren 属性接收组件实例传入的子节点
        + 使用 defaultProps 为 props 对象中属性设置初始化值
        + React.FunctionComponent 可以简写为 const Hello: FC<BaseProps> = (props) => {}
    */
    return <h1>{props.message}</h1>  
}

/* 与Node.js、Browserify或webpack 一起使用： */
var classNames = require('classnames');
classNames('foo', 'bar'); // => 'foo bar'
classNames('foo', 'bar'); // => 'foo bar'
classNames('foo', { bar: true }); // => 'foo bar'
classNames({ 'foo-bar': true }); // => 'foo-bar'
classNames({ 'foo-bar': false }); // => ''
classNames({ foo: true }, { bar: true }); // => 'foo bar'
classNames({ foo: true, bar: true }); // => 'foo bar'
/* // lots of arguments of various types */
classNames('foo', { bar: true, duck: false }, 'baz', { quux: true }); // => 'foo bar baz quux'
// other falsy values are just ignored
classNames(null, false, 'bar', undefined, 0, 1, { baz: null }, ''); // => 'bar 1'
/* 与 React.js 一起使用 */
/* 这个包是 的官方替代品classSet，它最初是在 React.js 插件包中提供的。
它的主要用例之一是使动态和条件className道具更易于使用（尤其是比条件字符串操作更简单）。因此，您可能有以下代码来className为<button>React 中的a生成道具： */             
class Button extends React.Component {
  // ...
  render () {
    var btnClass = 'btn';
    if (this.state.isPressed) btnClass += ' btn-pressed';
    else if (this.state.isHovered) btnClass += ' btn-over';
    return <button className={btnClass}>{this.props.label}</button>;
}
}
/* 您可以将条件类更简单地表示为一个对象： */
var classNames = require('classnames');
class Button extends React.Component {
  // ...
  render () {
    var btnClass = classNames({
      btn: true,
      'btn-pressed': this.state.isPressed,
      'btn-over': !this.state.isPressed && this.state.isHovered
    });
    return <button className={btnClass}>{this.props.label}</button>;
}
}
/*因为您可以将对象、数组和字符串参数混合在一起，所以支持可选的classNameprops 也更简单，因为结果中只包含真实的参数： */
var btnClass = classNames('btn', this.props.className, {
  'btn-pressed': this.state.isPressed,
  'btn-over': !this.state.isPressed && this.state.isHovered
});

import React,{  ButtonHTMLAttributes, AnchorHTMLAttributes, FC } from 'react'
import classNames form 'classnames'
//声明按钮尺寸-枚举
export enum ButtonSize {
    Large = 'lg',
    Small = 'sm'
}
//声明按钮样式-枚举
export enum ButtonType{
  	Primary = 'primary',
    Default = 'default',
    Danger = 'danger',
    Link = 'link'
}
//声明按钮组件 props 接口
interface BaseButtonProps {
  className?: string;
  /*设置 Button的禁用*/
  disabled?:boolean;
  /*设置 Button的尺寸*/
  size?:ButtonSize;
  /*设置 Button 的类型*/
  btnType?:ButtonType;
  children: React.ReactNode; //ReactNode reactnode节点
  /*设置A标签href的类型*/
  href?:string;
}
//声明按钮与超链接标签的原生事件
type NativeButtonProps = BaseButtonProps & ButtonHTMLAttributes<HTMLElement>
type AnchorButtonProps = BaseButtonProps & AnchorHTMLAttributes<HTMLElement>
export type ButtonProps = Partial<NativeButtonProps & AnchorButtonProps>
export conast Button:FC<ButtonProps> = (props) =>{
  const {
    btnType, //传递进来按钮样式属性
    className, //传递进来自定义样式属性
    disabled, //传递进来是否禁用属性
    size,
    children,
    href,
    ...restProps  //解析按钮与超链接的原生事件属性
  } = props;
  /*样式拼接处理*/
  const classes = classNames('btn', className, {
  	/*[`btn-${btnType}`] : boolean
      boolean:
        + 为真返回 [`btn-${btnType}`]
        + 为假 不返回任何内容
    */
    [`btn-${btnType}`]: btnType,
    [`btn-${size}`]:size,
    'disabled':(btnType === 'link') && disabled //如果传递btnType的属性值为link并设置disabled属性，按钮就是禁用状态。
  });
  if(btnType === "link" && href){
    return (
      <a
        className={classes}
        href={href}
        {...restProps} //解析按钮与超链接的原生事件属性
      > 
        {children}
      </a>
    )
  }else{
    return(
      <button
          className={classes}
          disabled={disabled}
        	{...restProps}
      >
        {children}
      </button>
    )
  }
}
/*定义 props 的默认值*/
Button.defaultProps = {
  disabled:false,
  btntype:ButtonType.Default,
  btntype:ButtonSize.Large,
}
export default Button;

import React from 'react';
import ReactDOM from 'react-dom/client';
import './styles/index.scss'
import App from './App';
const root = ReactDOM.createRoot(
  document.getElementById('root') as HTMLElement
);
root.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>
);

.btn { 
 	position: relative;
  display: inline-block;
  font-weight: 400;
  line-height: 1.5;
  white-space: nowrap;
  text-align: center;
  vertical-align: middle;
  background-image: none;
  border: 1px solid transparent;
  border-radius: 0.25rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 1px 1px rgba(0, 0, 0, 0.075);
  transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
  cursor: pointer;
}
.btn-danger { 
  color: #fff;
  background: #dc3545;
  border-color: #dc3545;
}
.btn-primary { 
  color: #fff;
  background: #0d6efd;
  border-color: #0d6efd;
}
.btn-lg { 
  padding: 0.5rem 1rem;
  font-size: 1.25rem;
  border-radius: 0.3rem;
}
.btn-sm { 
  padding: 0.25rem 0.5rem;
  font-size: 0.875rem;
  border-radius: 0.2rem;
}
.btn-xxx { 
  width:200px;
  height:200px;
}
.btn-link {
  font-weight: 400;
  color: #0d6efd;
  text-decoration: none;
  box-shadow: none;
}
.disabled,
.btn[disabled]{
  cursor: not-allowed;
  opacity: 0.65;
  box-shadow: none;
}

import React from 'react';
// 导入Button 组件
import Button,{ButtonType,ButtonSize} from './conponents/Button/button';
/*Button组价可选属性
	组件类型
  	ButtonType.Primary = 'primary'
    ButtonType.Default = 'default'
    ButtonType.Danger = 'danger'
    ButtonType.Link = 'link'
  组件大小
    ButtonSize.Large = 'lg'
    ButtonSize.Small = 'sm'
*/
function App() {
  return (
    <div className="App">
      <Button autoFocus>Hello</Button>
      <Button className='btn-xxx'>Hello</Button>
      <Button disabled>Disabled Button</Button>
      <Button btnType={ButtonType.Primary} size={ButtonSize.Large}>Primary-Lrage-Button</Button>
      <Button btnType={ButtonType.Danger} size={ButtonSize.Small}>Danger-Small-Button</Button>
      <Button btnType={ButtonType.Link} href='http://www.xxx.com' disabled>被禁用的按钮</Button>
      <Button btnType={ButtonType.Link} href='http://www.xxx.com'  target='target'>在新窗口打开</Button>
    </div>
  );
}
export default App;