您的位置:首页 > 其它

kbone 高级 - 使用 rem

2020-09-08 14:27 369 查看

kbone
 没有支持 
rpx
,取而代之的是可以使用更为传统的 
rem
 进行开发。使用流程如下:

1、用法

1.1 修改 webpack 插件配置

在 mp-webpack-plugin 这个插件的配置中的 global 字段内补充 rem 配置。

[code]module.exports = {
global: {
rem: true,
},
// ... other options
}

1.2 在业务代码里就可以设置 html 的 font-size 样式了,比如如下方式:

[code]window.onload = function() {
if (process.env.isMiniprogram) {
// 小程序
document.documentElement.style.fontSize = wx.getSystemInfoSync().screenWidth / 16 + 'px'
} else {
// Web 端
document.documentElement.style.fontSize = document.documentElement.getBoundingClientRect().width / 16 + 'px'
}
}

1.3 在业务代码的样式里使用 rem。

[code].content {
width: 10rem;
}
PS:这个特性只在基础库 2.9.0 及以上版本支持。

2、案例

在 

kbone-advanced
 目录下创建 
05-rem
 目录,本案例在这个目录下完成。

2.1 创建 package.json

[code]cd 05-rem
npm init -y

编辑 package.json:

[code]{
"name": "01-env",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"build": "rimraf dist/web && cross-env NODE_ENV=production webpack --config build/webpack.config.js --progress --hide-modules",
"mp": "cross-env NODE_ENV=production webpack --config build/webpack.mp.config.js --progress --hide-modules"
},
"dependencies": {
"add": "^2.0.6",
"vue": "^2.5.11"
},
"browserslist": [
"> 1%",
"last 2 versions",
"not ie <= 8"
],
"devDependencies": {
"babel-core": "^6.26.0",
"babel-loader": "^7.1.2",
"babel-preset-env": "^1.6.0",
"cross-env": "^5.0.5",
"css-loader": "^0.28.7",
"file-loader": "^1.1.4",
"html-webpack-plugin": "^4.0.0-beta.5",
"mini-css-extract-plugin": "^0.5.0",
"optimize-css-assets-webpack-plugin": "^5.0.1",
"stylehacks": "^4.0.3",
"vue-loader": "^15.7.0",
"vue-template-compiler": "^2.6.10",
"webpack": "^4.29.6",
"webpack-cli": "^3.2.3",
"mp-webpack-plugin": "latest"
},
"keywords": [],
"author": "",
"license": "ISC"
}

安装依赖包:

[code]npm install

2.2 配置 webpack

在 05-rem/build 目录下创建 webpack.config.js,内容如下:

[code]var path = require('path')
var MiniCssExtractPlugin = require('mini-css-extract-plugin')
const webpack = require('webpack')
const { VueLoaderPlugin } = require('vue-loader')
const HtmlWebpackPlugin = require('html-webpack-plugin')

module.exports = {
mode: 'production',
entry: {
index: path.resolve(__dirname, '../src/main.js'),
},
output: {
path: path.resolve(__dirname, '../dist/web/'),
publicPath: './',
filename: '[name].js'
},
target: 'web',
module: {
rules: [
{
test: /\.css$/,
use: [
MiniCssExtractPlugin.loader,
'css-loader'
],
},      {
test: /\.vue$/,
loader: 'vue-loader',
},
{
test: /\.js$/,
use: {
loader: 'babel-loader',
options: {
presets: ['env']
}
},
exclude: /node_modules/
},
{
test: /\.(png|jpg|gif|svg)$/,
loader: 'file-loader',
options: {
name: '[name].[ext]?[hash]'
}
}
]
},

resolve: {
extensions: ['*', '.js', '.vue', '.json']
},

plugins: [
new webpack.DefinePlugin({
'process.env.isMiniprogram': false, // 注入环境变量,用于业务代码判断
}),
new MiniCssExtractPlugin({
filename: '[name].css'
}),
new VueLoaderPlugin(),
new HtmlWebpackPlugin({
filename: 'index.html',
chunks: ['index'],
template: path.join(__dirname, '../index.html')
}),
]
}

2.3 创建 main.js

在 

01-env/src
 目录下创建 
main.js
,内容如下:

[code]import Vue from 'vue'
import App from './App'

window.onload = function() {
if (process.env.isMiniprogram) {
// 小程序
document.documentElement.style.fontSize = wx.getSystemInfoSync().screenWidth / 16 + 'px'
} else {
// Web 端
document.documentElement.style.fontSize = document.documentElement.getBoundingClientRect().width / 16 + 'px'
}
}

new Vue({
el: '#app',
render: h => h(App)
})

2.3 创建 App.vue

在 

05-rem/src
 目录下创建 
App.vue
,内容如下:

[code]<template>
<div class="title">
hello, {{info}}!
</div>
</template>

<script>
export default {
computed: {
info() {
if (process.env.isMiniprogram) {
return 'miniprogram'
} else {
return 'web'
}
}
}
}
</script>

<style lang="css">
.title {
font-size: 1rem;
color:brown;
}
</style>

2.4 编写入口文件 index.html

在项目根目录下创建 

index.html
,内容如下:

[code]<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no,minimal-ui, viewport-fit=cover" />
<meta content="yes"name="apple-mobile-web-app-capable"/>
<meta content="black"name="apple-mobile-web-app-status-bar-style"/>
<meta name="format-detection"content="telephone=no, email=no" />
<title>vue</title>
<style type="text/css">
#app {
font-family: 'Avenir', Helvetica, Arial, sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
text-align: center;
color: #2c3e50;
margin-top: 60px;
}
</style>
</head>
<body>
<div id="app"></div>
</body>
</html>

2.5 Web端效果预览

[code]npm run build

 

2.6 创建 webpack.mp.config.js

在 

05-rem/build
 目录下创建 webpack.mp.config.js,内容如下:

[code]const path = require('path')
const webpack = require('webpack')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const { VueLoaderPlugin } = require('vue-loader')
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin')
const MpPlugin = require('mp-webpack-plugin') // 用于构建小程序代码的 webpack 插件

const isOptimize = false // 是否压缩业务代码,开发者工具可能无法完美支持业务代码使用到的 es 特性,建议自己做代码压缩

module.exports = {
mode: 'production',
entry: {
'app': path.resolve(__dirname, '../src/main.mp.js')
},
output: {
path: path.resolve(__dirname, '../dist/mp/common'), // 放到小程序代码目录中的 common 目录下
filename: '[name].js', // 必需字段,不能修改
library: 'createApp', // 必需字段,不能修改
libraryExport: 'default', // 必需字段,不能修改
libraryTarget: 'window', // 必需字段,不能修改
},
target: 'web', // 必需字段,不能修改
optimization: {
runtimeChunk: false, // 必需字段,不能修改
splitChunks: { // 代码分隔配置,不建议修改
chunks: 'all',
minSize: 1000,
maxSize: 0,
minChunks: 1,
maxAsyncRequests: 100,
maxInitialRequests: 100,
automaticNameDelimiter: '~',
name: true,
cacheGroups: {
vendors: {
test: /[\\/]node_modules[\\/]/,
priority: -10
},
default: {
minChunks: 2,
priority: -20,
reuseExistingChunk: true
}
}
},

minimizer: isOptimize ? [
// 压缩CSS
new OptimizeCSSAssetsPlugin({
assetNameRegExp: /\.(css|wxss)$/g,
cssProcessor: require('cssnano'),
cssProcessorPluginOptions: {
preset: ['default', {
discardComments: {
removeAll: true,
},
minifySelectors: false, // 因为 wxss 编译器不支持 .some>:first-child 这样格式的代码,所以暂时禁掉这个
}],
},
canPrint: false
}),
// 压缩 js
new TerserPlugin({
test: /\.js(\?.*)?$/i,
parallel: true,
})
] : [],
},
module: {
rules: [
{
test: /\.css$/,
use: [
MiniCssExtractPlugin.loader,
'css-loader'
],
},
{
test: /\.vue$/,
loader: [
'vue-loader',
],
},
{
test: /\.js$/,
use: {
loader: 'babel-loader',
options: {
presets: ['env']
}
},
exclude: /node_modules/
},
{
test: /\.(png|jpg|gif|svg)$/,
loader: 'file-loader',
options: {
name: '[name].[ext]?[hash]'
}
}
]
},

resolve: {
extensions: ['*', '.js', '.vue', '.json']
},

plugins: [
new webpack.DefinePlugin({
'process.env.isMiniprogram': true, // 注入环境变量,用于业务代码判断
}),
new MiniCssExtractPlugin({
filename: '[name].wxss',
}),
new VueLoaderPlugin(),
new MpPlugin(require('./miniprogram.config.js')),
],
}

2.7 创建 main.mp.js

在 

05-rem/src
 下创建 
main.mp.js
 文件,内容如下:

[code]import Vue from 'vue'
import App from './App'

export default function createApp() {
const container = document.createElement('div')
container.id = 'app'
document.body.appendChild(container)

window.onload = function() {
if (process.env.isMiniprogram) {
// 小程序
document.documentElement.style.fontSize = wx.getSystemInfoSync().screenWidth / 16 + 'px'
} else {
// Web 端
document.documentElement.style.fontSize = document.documentElement.getBoundingClientRect().width / 16 + 'px'
}
}

return new Vue({
el: '#app',
render: h => h(App)
})
}

2.8 小程序端效果预览

[code]npm run mp

内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: