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react-awesome-snippets-preload

v0.0.5

Published

可以提前缓存项目里的图片资源,预加载完毕再进入应用 https://0x9.me/4Ke1L

Downloads

20

Readme

图片资源预加载

可以提前缓存项目里的图片资源,预加载完毕再进入应用 http://t.cn/RQxWTFd

安装

npm install react-awesome-snippets-preload --save

属性参数

  • {Array} images 要缓存的图片地址数组
  • {Number} parallel 一次加载的图片数量,默认为 5。为了避免过多占用 http 连接数,缓存采用队列形式加载,这里定义队列中每次同时加载的图片数量
  • {Node|Function} component 缓存中时要渲染的节点

除以上参数,还可以传递react-transition-group中的cssTransition组件的可用参数,将会直接传递给所使用的cssTransition组件。例如:

  • timeout 默认为 1000
  • classNames 默认为 preload
  • unmountOnExit 默认为 true
  • ...

classNames不是定义节点class-name的className,这里要注意,这个是定义cssTransition用来使用的css类名前缀。默认为preload,即如果要使用动画,则需要在css中添加一些动画周期的样式定义:

.preload-exit {
    opacity: 1;
}
.preload-exit-active {
    opacity: 0;
    transition: opacity 1s ease-in;
}

具体请参考 react-tansition-group

使用

import React from 'react';
import { render } from 'react-dom';
import App from 'YOUR_COMPONENTS_DIR/App'; //项目入口组件
import Preload from 'react-awesome-snippets-preload';

//该例子中,缓存项目 static/images 目录下的图片资源
const imgContext = require.context('static/images', true, /\.(jpg|png|gif)$/);
const images = imgContext.keys().map(path => imgContext(path));

render(
    <Preload
        images={images}
        component={({ percent }) => (
            <div className="preload">
                <div className="progress">
                    <div className="bar-outer">
                        <div className="bar-inner" style={{ width: percent * 100 + '%' }} />
                    </div>
                    <div className="text">当前加载进度:{ percent * 100 }%</div>
                </div>
            </div>
        )}>
        <App />
    </Preload>,
    document.getElementById('root')
);