安装依赖

npm install styled-components -S

一、定义全局样式

1. styled-components v3 版本

1. 创建 style.js

import { injectGlobal } from 'styled-components';

injectGlobal`
    body {
        margin: 0;
        padding: 0;
        background:#ccc;
    }
`;

2. 在 index.js 中引入

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import './style.js';

ReactDOM.render(<App />, document.getElementById('root'));

2. styled-components v4 版本以上

1. 创建 style.js

import { createGlobalStyle } from 'styled-components';

export const GlobalStyle = createGlobalStyle`
html, body, div, span, applet, object, iframe,
    h1, h2, h3, h4, h5, h6, p, blockquote, pre,
    a, abbr, acronym, address, big, cite, code,
    del, dfn, em, img, ins, kbd, q, s, samp,
    small, strike, strong, sub, sup, tt, var,
    b, u, i, center,
    dl, dt, dd, ol, ul, li,
    fieldset, form, label, legend,
    table, caption, tbody, tfoot, thead, tr, th, td,
    article, aside, canvas, details, embed, 
    figure, figcaption, footer, header, hgroup, 
    menu, nav, output, ruby, section, summary,
    time, mark, audio, video {
        margin: 0;
        padding: 0;
        border: 0;
        font-size: 100%;
        font: inherit;
        vertical-align: baseline;
    }
    /* HTML5 display-role reset for older browsers */
    article, aside, details, figcaption, figure, 
    footer, header, hgroup, menu, nav, section {
        display: block;
    }
    body {
        line-height: 1;
    }
    ol, ul {
        list-style: none;
    }
    blockquote, q {
        quotes: none;
    }
    blockquote:before, blockquote:after,
    q:before, q:after {
        content: '';
        content: none;
    }
    table {
        border-collapse: collapse;
        border-spacing: 0;
    }
`;

2. 在 index.js 中引入并使用

import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';
import { GlobalStyle } from './style'
const root = ReactDOM.createRoot(document.getElementById('root'));              
root.render(
    <React.StrictMode>
        <GlobalStyle />
        <App />
    </React.StrictMode>,
);

二、定义组件内样式

1. 创建 style.js 样式文件

新建 src\pages\test\styled.js

import styled from 'styled-components'

export const Wrapper = styled.div`
    display: flex;
    flex-wrap: wrap;
    width: 300px;
    height: 300px;
`
export const Item = styled.div`
    height: 100px;
    width: 100px;
    background: red;
    text-align:center;
    line-height:100px;
    &:nth-child(2n-1){
        background: yellow;
    }
`

2. 在组件中引入并使用 styled.js

新建 src\pages\test\index.js

import React, { Component} from 'react'
import { Wrapper,Item } from './styled'
class Test extends Component{
    state = {}
    render(){
        return (
            <Wrapper>
                <Item>1</Item>
                <Item>2</Item>
                <Item>3</Item>
                <Item>4</Item>
                <Item>5</Item>
                <Item>6</Item>
                <Item>7</Item>
                <Item>8</Item>
                <Item>9</Item>
            </Wrapper>
        )
    }
}

export default Test;

三、styled-components 常见用法

1. 传参

在组件标签上绑定参数，通过箭头函数获取并操作参数

import React, { Component} from 'react'
import styled from 'styled-components'

const Wrapper = styled.div`
    display: flex;
    flex-wrap: wrap;
    width: ${props => props.wrapperWidth};
    height: ${({wrapperHeight}) => wrapperHeight};
`
const Item = styled.div`
    height: 100px;
    width: 100px;
    background: red;
    text-align:center;
    line-height:100px;
    &:nth-child(2n-1){
        background: yellow;
    }
`
class Test extends Component{
    state = {}
    render(){
        return (
            <Wrapper wrapperWidth="300px" wrapperHeight="300px">
                <Item>1</Item>
                <Item>2</Item>
                <Item>3</Item>
                <Item>4</Item>
                <Item>5</Item>
                <Item>6</Item>
                <Item>7</Item>
                <Item>8</Item>
                <Item>9</Item>
            </Wrapper>
        )
    }
}

export default Test;

2. 继承

通过 styled(父组件) 来继承父组件属性

import React, { Component} from 'react'
import styled from 'styled-components'

const Wrapper = styled.div`
    display: flex;
    flex-wrap: wrap;
    width: 300px;
    height: 300px;
`
const CommitItem = styled.div`
    height: 100px;
    width: 100px;
    background: red;
    text-align:center;
    line-height:100px;
`
const Item = styled(CommitItem)`
    &:nth-child(2n-1){
        background: yellow;
    }
`
class Test extends Component{
    state = {}
    render(){
        return (
            <Wrapper>
                <Item>1</Item>
                <Item>2</Item>
                <Item>3</Item>
                <Item>4</Item>
                <Item>5</Item>
                <Item>6</Item>
                <Item>7</Item>
                <Item>8</Item>
                <Item>9</Item>
            </Wrapper>
        )
    }
}

export default Test;

3. 操作 styled 组件属性

可以在组件标签上定义属性，也可以通过 attrs 定义属性

import React, { Component} from 'react'
import styled from 'styled-components'


const PasswordInput = styled.input.attrs(({type,placeholder})=>({
    type: type? type : 'text',
    placeholder: placeholder || '请输入',
}))`
    width: 100px;
    background: yellow;
`

class Test extends Component{
    state = {
        password: '123456'
    }
    render(){
        return (
            <PasswordInput defaultValue={this.state.password} type="password" placeholder="请输入密码" ></PasswordInput>
        )
    }
}

export default Test;