标题：延时场景搭建方案模板
一、简介
随着互联网的发展，延迟加载技术在各个领域得到了广泛应用，作为一种可以提高网站或应用的性能、响应速度和用户体验的解决方案，延迟加载技术逐渐成为了前端开发中的重要手段。本文将介绍一种基于延迟加载技术的场景搭建方案模板，帮助开发者快速搭建高效、稳定的延迟加载场景。
二、搭建流程
1.准备工作
首先，确保你已经安装了所需的依赖库，如Webpack、Babel、TypeScript等。如果你的项目基于Node.js，还需要安装Node.js环境。
2. 创建项目结构
在项目中创建一个延迟加载场景搭建的文件夹，分别创建以下4个文件：
- `src/components/Button.tsx`
- `src/components/Form.tsx`
- `src/components/Modal.tsx`
- `src/constants/延迟加载场景搭建.ts`
3. 配置Webpack
在项目根目录下，创建一个名为`webpack.config.js`的配置文件，并添加以下内容：
```javascript
const path = require
('path');
module.exports = {
mode: 'development',
entry: './src/main.js',
output: {
filename:'main.js',
path: path.resolve
(__dirname, 'dist')
},
module: {
rules: [
{
test: /\.tsx?$/,
exclude: /node_modules/,
use: 'babel-loader'
}
]
},
plugins: [
new BabelPlugin
({
extensions: ['~'],
loader: 'js-loader'
})
]
};
```
4. 配置Babel
在`src/plugins/index.js`文件中，添加以下内容：
```javascript
const path = require
('path');
module.exports = {
extends: [
'plugin-babel-loader',
'plugin-babel-preset-env',
'plugin-babel-preset-react'
],
plugins: [
new Babel
({
preset: '@babel/preset-env',
plugins: [
new BabelPlugin
({
extensions: ['~'],
loader: 'js-loader'
})
]
})
]
};
```
5. 创建延迟加载场景
在`src/components/Modal.tsx`中，添加以下代码：
```javascript
import React, { useEffect, useState } from'react';
const Modal =
({ isOpen, children }) => {
const [timer, setTimer] = useState
(null);
useEffect
(
() => {
const handleClick =
() => {
setTimer
(
() =>
(new Date
().getTime
() + 500));
};
const closeModal =
() => {
clearTimeout
(timer);
};
const handleKeyDown =
(event) => {
if
(event.key === 'Escape') {
closeModal
();
} else {
handleClick
();
}
};
window.addEventListener
('keydown', handleKeyDown);
return
() => {
window.removeEventListener
('keydown', handleKeyDown);
};
}, [isOpen, children]);
useEffect
(
() => {
if
(!isOpen) {
clearTimeout
(timer);
}
}, [isOpen]);
const render =
() => {
const [isLoading, setIsLoading] = useState
(true);
useEffect
(
() => {
if
(!isLoading) {
return null;
}
return
Loading...
;
}, [isLoading]);
return
(
{isLoading? 'Loading...' : 'Modal Content'}
{isLoading? 'Loading...' : 'This is a modal'}
);
};
return
(
{isOpen && {render
()}}
);
};
export default Modal;
```
6. 完善配置
在`src/constants/延迟加载场景搭建.ts`中，添加以下内容：
```javascript
const buttonLoading = document.createElement
('div');
buttonLoading.classList.add
('loading');
buttonLoading.textContent = 'Loading...';
document.body.appendChild
(buttonLoading);
const modalLoading = document.createElement
('div');
modalLoading.classList.add
('loading');
modalLoading.textContent = 'Loading...';
document.body.appendChild
(modalLoading);
export const useButtonLoading =
() => {
const button = document.querySelector
('.btn');
const isLoading = button.classList.contains
('loading');
return isLoading;
};
export const useModalLoading =
() => {
const modal = document.querySelector
('.modal');
const isLoading = modal.classList.contains
('loading');
return isLoading;
};
```
三、延时加载场景使用示例
1.在项目中引入并使用`Button`组件：
```javascript
import React from'react';
import Button from './Button';
const App =
() => {
const [isLoading, setIsLoading] = useState
(true);
const handleClick =
() => {
setIsLoading
(false);
};
return
(
{isLoading? 'Loading...' : 'Button Content'}
{isLoading? 'Loading...' : 'This is a button'}
);
};
export default App;
```
2. 在项目中引入并使用`Form`组件：
```javascript
import React from'react';
import Form from './Form';
const App =
() => {
const [isLoading, setIsLoading] = useState
(true);
const handleSubmit =
(event) => {
setIsLoading
(false);
};
return
(
);
};
export default App;
```
3. 在项目中引入并使用`Modal`组件：
```javascript
import React from'react';
import Modal from './Modal';
const App =
() => {
const [isLoading, setIsLoading] = useState
(true);
const handleClose =
() => {
setIsLoading
(false);
};
return
(
{isLoading? 'Loading...' : 'Modal Content'}
{isLoading? 'Loading...' : 'This is a modal'}
);
};
export default App;
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