Styled-components--V4 injectGlobal的弃用

小咪咪 2022-05-04 08:27 45阅读 0赞

> 注：在styled-component V4版本中injectGlobal API除去，取而代之的是createGlobalStyle样式组件。
> 
> 也就是说以前的 injectGlobal 全局样式在V4版本代替为使用 createGlobalStyle 渲染组件的方式来使用全局样式。

--------------------

官方文档说明（地址：[https://www.styled-components.com][https_www.styled-components.com]）：

A helper method to write global CSS. It does not return a component, but adds the styles to the stylesheet directly.

<table> 
 <thead> 
  <tr> 
   <th>ARGUMENTS</th> 
   <th>DESCRIPTION</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <th>1.&nbsp;TaggedTemplateLiteral</th> 
   <th>A tagged template literal with your global styles inside.</th> 
  </tr> 
 </tbody> 
</table>

import { injectGlobal } from 'styled-components' 
    
    injectGlobal` 
    @font-face { 
        font-family: "Operator Mono"; 
        src: url("../fonts/Operator-Mono.ttf"); 
    } 
    body { 
        margin: 0; 
    } 
    `

We do not encourage the use of this. Try to use it once per app at most, if you must, contained in a single file. This is an escape hatch. Only use it for the rare @font-face definition or body styling.

--------------------

createGlobalStyle 官方说明：

A helper function to generate a special StyledComponent that handles global styles. Normally, styled components are automatically scoped to a local CSS class and therefore isolated from other components. In the case of createGlobalStyle, this limitation is removed and things like CSS resets or base stylesheets can be applied.

<table> 
 <thead> 
  <tr> 
   <th>ARGUMENTS</th> 
   <th>DESCRIPTION</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <th>1.&nbsp;TaggedTemplateLiteral</th> 
   <th>A tagged template literal with your CSS and interpolations.</th> 
  </tr> 
 </tbody> 
</table>

Returns a StyledComponent that does not accept children. Place it at the top of your React tree and the global styles will be injected when the component is "rendered".

import { createGlobalStyle } from 'styled-components'
    
    const GlobalStyle = createGlobalStyle`
      body {
        color: ${props => (props.whiteColor ? 'white' : 'black')};
      }
    `
    
    // later in your app
    
    <React.Fragment>
      <Navigation /> {/* example of other top-level stuff */}
      <GlobalStyle whiteColor />
    </React.Fragment>

Since the GlobalStyle component is a StyledComponent, that means it also has access to theming from the <ThemeProvider> component if provided.

import { createGlobalStyle, ThemeProvider } from 'styled-components'
    
    const GlobalStyle = createGlobalStyle`
      body {
        color: ${props => (props.whiteColor ? 'white' : 'black')};
        font-family: ${props => props.theme.fontFamily};
      }
    `
    
    // later in your app
    
    <ThemeProvider theme={
       { fontFamily: 'Helvetica Neue' }}>
      <React.Fragment>
        <Navigation /> {/* example of other top-level stuff */}
        <GlobalStyle whiteColor />
      </React.Fragment>
    </ThemeProvider>

--------------------

实例测试：

style.js :

import {createGlobalStyle} from 'styled-components';
    
    export const GlobalStyle = createGlobalStyle`
        body {
            background: blue;
        }
    `;

App.js:

import React, { Component,Fragment } from 'react';
    import Header from "./common/header";
    //导入样式文件
    import {GlobalStyle} from "./style";
    
    class App extends Component {
        render() {
            return (
                <Fragment>
                    <GlobalStyle/>
                        <Header/>
                </Fragment>
            )
        }
    }
    
    export default App;

做的不好，仅供参考！

[https_www.styled-components.com]: https://www.styled-components.com