css样式组件化：styled-components

文档参考

前言

       随着web应用越来越复杂，组件化的开发方式逐渐被大多数的公司及开发者所使用。组件化的开发方式是将结构、样式和逻辑放到一起，组合成一个可重用性比较强的组件。styled-component是一个实现在js中写css样式，将样式封装成一个组件的react的第三方工具。

用法

安装：
在react项目根目录执行以下命令：
npm install --save styled-components
或
yarn add styled-components

全局重置样式

       在react的入口文件同级目录新建style.js文件，引入 styled-components 并全局重置css，具体实现如下：

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;
    }
    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;
    }
`;

       在react入口文件中引用：

import React, {Component, Fragment} from 'react';
import { Provider } from 'react-redux';
import { BrowserRouter, Route} from 'react-router-dom';
import store from './store/index';
import { Globalstyle } from './style'; // 全局样式控制
import Home from './containers/Home/RootContainer/index';

class App extends Component {

    render() {
        return (
            <Fragment>
                <Provider store={store}>
                    <BrowserRouter>
                        <Fragment>
                            {/* exact 完全匹配路由 */}
                            <Route path="/" exact component={Home} />
                        </Fragment>
                    </BrowserRouter>
                </Provider>
                <Globalstyle />
            </Fragment>
        );
    }
}

export default App;

页面中的使用

       构建组件，在home.js 同级目录下新建style.js文件，定义ContentWrapper 和 HomeContent组件，用于页面存放内容。在home.js 文件中引入，具体如下：

style.js

import styled from 'styled-components';

export const HomeWrapper = styled.div`
        overflow: hidden;
        width: 1000px;
        margin: 0 auto;
        color: red;
`;

export const HomeContent = styled.div`
        float: left;
        width: 800px;
        margin-left: 15px;
        color: green;
`;

home.js

import React, { PureComponent } from 'react';
import { connect } from 'react-redux';
import { 
    HomeWrapper, HomeContent
} from './style.js';

const mapDispatch = (dispatch) => {
    return {
    }
};

const mapState = (state) => {
    return {
    }
};

class Home extends PureComponent {

    render() {
        return (
            <HomeWrapper>
                内容1
                <HomeContent>
                      内容2
                </HomeContent>
            </HomeWrapper>
        )
    }
}

export default connect(mapState, mapDispatch)(Home);

组建内子标签样式 使用className

<HomeWrapper>
    内容1
    <HomeContent>
          内容2
          <div className='homeContent_div'>
              内容3
          </div>
    </HomeContent>
</HomeWrapper>

style.js

export const HomeContent = styled.div`
        float: left;
        width: 800px;
        margin-left: 15px;
        color: green;
        .homeContent_div {
              color: #000;
        }
`;

参数传递

<HomeWrapper>
    内容1
    <HomeContent>
          内容2
          <div className='homeContent_div'>
              内容3
          </div>
          <BackgroundDiv className='homeContent_div' imgUrl="https://cn.bing.com/images/search?q=%e5%9f%8e%e5%b8%82%e5%a4%9c%e6%99%af%e6%91%84%e5%bd%b1&FORM=ISTRTH&id=3AD1608F3918A3D5789F65FED97453F3E1BDC647&cat=%E6%91%84%E5%BD%B1&lpversion=">
              内容4
          </BackgroundDiv>
    </HomeContent>
</HomeWrapper>

style.js

import styled from 'styled-components';

export const BackgroundDiv = styled.div`
    width: 300px;
    height: 100px;
    background: url(${ (props)=>props.imgUrl });
    background-size: contain;
`;

       styled-components 支持所有的css样式及写法，后面用到更深层的用法会及时分享。

期待共同学习！