- 背景
- 在前端開發時,一些常見的組件(如select)往往不能滿足現實開發需求,需要對組件進行重新的封裝和優化
- 重新封裝優化的組件往往會用在不同的幾個項目,這個時候如果要在另外一個項目中使用這個組件,就只能把組件代碼重新copy一份,這樣存在很多弊端,第一點就是代碼冗餘;第二點是如果要對這個組件進行升級修改,這個時候得去每個項目下修改一遍,想想就頭大
爲了解決這個問題,做了以下探索,特此記錄以下操作的流程,中間有很多細節本文不詳細解釋,因爲還有很多配置不是很明白,找個機會系統講一下npm相關知識
- 爲什麼要搭建npm私有倉庫(私服)
eg:
1.有三個項目A、B 、C
2.在A項目寫了一個select組件,又不能將這個組件發佈到npm公共社區裏
沒有npm私服時的做法:
-
這時如果B和C項目要用帶這個組件的話,只能去A項目裏複製一份粘貼到B和C項目
-
如果後面select組件更新了的話,又只能複製粘貼
如上這種情況,耗費時間。有時還會忘了哪個項目的組件時最新的。一個組件都這麼麻煩,如果是多個組件和多個項目,維護簡直要瘋了。
如果我們有npm私有倉庫的做法:
- 將select組件發佈到私有倉庫裏
- 每個項目啓動前,執行npm 命令重新下載更新組件即可
私有npm私有倉庫的好處
- 便於管理企業內的業務組件或者模塊
- 私密性
- 確保npm服務快速穩定(私服通常搭建在內部的服務器裏)
- 控制npm模塊質量和安全(防止惡意代碼植入)
- 自定義組件發佈到私有倉庫的流程(Windows系統)
1.創建組件
md gldSelect
cd gldSelect
2.創建以下文件或文件夾
md build
md src
package.json
{
"name": "gld-select",
"version": "1.0.1",
"description": "This is an optimized Select component",
"main": "build/index.js",
"peerDependencies": {
"react-dom": "^16.12.0",
"react": "^16.4.0"
},
"scripts": {
"start": "webpack --watch",
"build": "webpack"
},
"author": {
"name": "szyy"
},
"license": "ISC",
"dependencies": {
"antd": "^3.26.5",
"prop-types": "^15.7.2",
"react": "^16.4.0",
"react-dom": "^16.12.0",
"webpack": "^4.12.0"
},
"devDependencies": {
"babel-cli": "^6.26.0",
"babel-core": "^6.26.3",
"babel-loader": "^7.1.5",
"babel-plugin-transform-class-properties": "^6.24.1",
"babel-plugin-transform-object-rest-spread": "^6.26.0",
"babel-plugin-transform-react-jsx": "^6.24.1",
"babel-preset-env": "^1.7.0",
"babel-preset-es2015": "^6.24.1",
"babel-preset-stage-0": "^6.24.1",
"webpack-cli": "^3.3.10"
}
}
webpack.config.js
var path = require('path');
module.exports = {
entry: './src/index.js',
output: {
path: path.resolve(__dirname, 'build'),
filename: 'index.js',
libraryTarget: 'commonjs2'
// libraryTarget: 'umd'
},
module: {
rules: [
{
test: /\.js$/,
include: path.resolve(__dirname, 'src'),
exclude: /(node_modules|bower_components|build)/,
use: {
loader: 'babel-loader',
options: {
presets: ["env", "stage-0"]
}
}
}
]
},
externals: {
'react': 'commonjs react'
}
};
.babelrc
{
"presets": ["env", "stage-0"],
"plugins": [
"transform-object-rest-spread",
"transform-react-jsx",
"transform-class-properties"
]
}
3.將自定義組件寫入到src/index.js
src/index.js
import React from "react";
import { Select } from "antd";
import PropTypes from "prop-types";
export default class GldSelect extends Select {
static propTypes = {
dataSource: PropTypes.array,
onChange: PropTypes.func,
};
static defaultProps = {
dataSource: [],
};
init(source, isSearch) {
this.pageNum = 1;
this.scrollPos = 0;
this.dataSource = source;
this.setState({
displayVals: this.dataSource.length > this.pageSize ?
this.dataSource.slice(0, this.pageSize * this.pageNum) : this.dataSource,
isSearch: isSearch,
});
}
constructor(props) {
super(props);
this.pageSize = 20;
this.pageNum = 1;
this.scrollPos = 0;
this.dataSource = props.dataSource;
this.state = {
displayVals: this.dataSource.length > this.pageSize ?
this.dataSource.slice(0, this.pageSize * this.pageNum) : this.dataSource,
isSearch: false,
};
}
componentDidUpdate(prevProps, prevState, snapshot) {
const { dataSource } = this.props;
const ds = [].concat(dataSource);
const preDs = [].concat(prevProps.dataSource);
if (preDs.sort().toString() !== ds.sort().toString()) {
this.init(dataSource)
}
}
handleChange = v => {
const { onChange, dataSource } = this.props;
const { isSearch } = this.state;
onChange && onChange(v);
/*點擊事件分爲兩種情況:
* 1.一般的下拉框選中,這時只需要執行props中的onChange
* 2.根據關鍵字搜索後,點擊選中時,需要恢復到初始的狀態
* */
if (isSearch === true) {
this.init(dataSource)
}
};
handleSearch = v => {
v = v || "";
const filterWord = v.trim();
const { dataSource } = this.props;
const newSource = dataSource.filter(item =>
item.includes(filterWord)
);
this.init(newSource, true);
};
handlePopupScroll = e => {
const { displayVals } = this.state;
e.persist();
const { target } = e;
const st = target.scrollTop;
if (st === 0 && this.scrollPos) {
target.scrollTop = this.scrollPos;
}
if (
st + target.offsetHeight + 2 >= target.scrollHeight &&
displayVals.length < this.dataSource.length
) {
this.pageNum += 1;
this.setState({ displayVals: this.dataSource.slice(0, this.pageSize * this.pageNum) });
this.scrollPos = st;
} else {
this.scrollPos = 0;
}
};
render() {
const { dataSource, ...rest } = this.props;
const { displayVals } = this.state;
return (
<Select
{...rest}
onChange={this.handleChange}
onPopupScroll={this.handlePopupScroll}
dropdownMatchSelectWidth={false}
maxTagCount={5}
onSearch={this.handleSearch}
>
{displayVals.map((opt) => (
<Select.Option key={opt} value={opt}>
{opt}
</Select.Option>
))}
</Select>
);
}
}
4.安裝相關npm包並打包
npm i
npm run build
npm link
npm link將用於在我們開發測試項目時對我們的組件進行開發測試。
5.測試組件是否可用,首先創建一個測試項目
npm i -g create-react-app
md gld-test
cd gld-test
create-react-app .
npm link gldSelect
測試項目創建成功後,在src/App.js中添加自定義組件gldSelect,並完成測試
import GldSelect from 'gldSelect';
...
<GldSelect />
App.js
import React from 'react';
import logo from './logo.svg';
import './App.css';
import GldSelect from 'gldSelect';
import {
Button,
Row,
Col,
Card,
Form,
Select,
DatePicker,
Icon,
Tabs,
notification,
Table,
} from 'antd';
function App() {
return (
<div className="App">
<header className="App-header">
<img src={logo} className="App-logo" alt="logo" />
<p>
Edit <code>src/App.js</code> and save to reload.
</p>
<a
className="App-link"
href="https://reactjs.org"
target="_blank"
rel="noopener noreferrer"
>
Learn React
</a>
</header>
<div>
<Form>
<Row>
<Col span={9}>
<Form.Item>
<GldSelect
style={{ width: '100%' }}
placeholder="選擇預算版本號"
mode="multiple"
dataSource={[1,3,4,5,7,8,9,0]}
/>
</Form.Item>
</Col>
</Row>
</Form>
</div>
</div>
);
}
export default App;
添加完成後,執行
npm start
如果在測試項目中可用,則該自定義組件可用,可上傳至npm私有庫
6.將自定義組件上傳私有庫
cd gldSelect
安裝nrm
npm install -g nrm
nrm(npm registry manager )是npm的鏡像源管理工具,有時候國外資源太慢,使用這個就可以快速地在 npm 源間切換
添加私有庫鏡像源
nrm add szyy http://xx.xxx.x.xxx:xxxx/repository/npm-host/
切換到私有庫鏡像源
nrm use szyy
登錄私有庫鏡像源賬號
npm login
(按照要求輸入賬號密碼以及郵箱)
登錄成功後,執行以下命令完成組件上傳
npm publish
7.項目中使用自定義組件
通過npm的config命令配置指向國內私有鏡像源:以後所有從倉庫獲取的包都從這個地址獲取,不走國外的地址
npm config set registry http://xx.xxx.x.xxx:xxxx/repository/npm/
在項目中執行以下命令,安裝自定義組件
npm install gld-select
在js文件代碼中直接引用
import GldSelect from 'gld-select'
- 參考資料