我正在使用webpack来管理reactjs项目。我想通过webpack在javascript中加载图像file-loader
。以下是webpack.config.js:
const webpack = require('webpack');
const path = require('path');
const NpmInstallPlugin = require('npm-install-webpack-plugin');
const PATHS = {
react: path.join(__dirname, 'node_modules/react/dist/react.min.js'),
app: path.join(__dirname, 'src'),
build: path.join(__dirname, './dist')
};
module.exports = {
entry: {
jsx: './app/index.jsx',
},
output: {
path: PATHS.build,
filename: 'app.bundle.js',
},
watch: true,
devtool: 'eval-source-map',
relativeUrls: true,
resolve: {
extensions: ['', '.js', '.jsx', '.css', '.less'],
modulesDirectories: ['node_modules'],
alias: {
normalize_css: __dirname + '/node_modules/normalize.css/normalize.css',
}
},
module: {
preLoaders: [
{
test: /\.js$/,
loader: "source-map-loader"
},
],
loaders: [
{
test: /\.html$/,
loader: 'file?name=[name].[ext]',
},
{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: 'babel-loader?presets=es2015',
},
{test: /\.css$/, loader: 'style-loader!css-loader'},
{test: /\.(jpe?g|png|gif|svg)$/i, loader: "file-loader?name=/public/icons/[name].[ext]"},
{
test: /\.js$/,
exclude: /node_modules/,
loaders: ['babel-loader?presets=es2015']
}
]
},
plugins: [
new webpack.optimize.UglifyJsPlugin({
compress: {
warnings: false,
},
output: {
comments: false,
},
}),
new NpmInstallPlugin({
save: true // --save
}),
new webpack.DefinePlugin({
"process.env": {
NODE_ENV: JSON.stringify("production")
}
}),
],
devServer: {
colors: true,
contentBase: __dirname,
historyApiFallback: true,
hot: true,
inline: true,
port: 9091,
progress: true,
stats: {
cached: false
}
}
}
我使用此行加载图像文件,并将它们复制到dist / public / icons目录,并保持相同的文件名。
{test: /\.(jpe?g|png|gif|svg)$/i, loader: "file-loader?name=/public/icons/[name].[ext]"}
但是使用它时我有两个问题。当我运行webpack
命令时,图像文件已按预期复制到dist / public / icons /目录。但是,它也已使用此文件名“ df55075baa16f3827a57549950901e90.png”复制到dist目录。
Another problem is that I used below code to import this image file but it is not showing on the browser. If I am using url 'public/icons/imageview_item_normal.png' on the img tag, it works fine. How to use the object imported from the image file?
import React, {Component} from 'react';
import {render} from 'react-dom';
import img from 'file!../../public/icons/imageview_item_normal.png'
export default class MainComponent extends Component {
render() {
return (
<div style={styles.container}>
download
<img src={img}/>
</div>
)
}
}
const styles = {
container: {
width: '100%',
height: '100%',
}
}
Once you have the file-loader configured in the webpack.config, whenever you use import/require it tests the path against all loaders, and in case there is a match it passes the contents through that loader. In your case, it matched
{
test: /\.(jpe?g|png|gif|svg)$/i,
loader: "file-loader?name=/public/icons/[name].[ext]"
}
and therefore you see the image emitted to
dist/public/icons/imageview_item_normal.png
which is the wanted behavior.
The reason you are also getting the hash file name, is because you are adding an additional inline file-loader. You are importing the image as:
'file!../../public/icons/imageview_item_normal.png'.
加上前缀file!
,会再次将文件传递到文件加载器中,这一次它没有名称配置。
因此,您的导入实际上应该只是:
import img from '../../public/icons/imageview_item_normal.png'
更新资料
如@cgatian所述,如果您实际上要使用嵌入式文件加载器,而忽略webpack全局配置,则可以在导入之前添加两个感叹号(!!):
import '!!file!../../public/icons/imageview_item_normal.png'.
导入png后,该img
变量仅保存文件加载器“知道”的路径,即public/icons/[name].[ext]
(aka "file-loader? name=/public/icons/[name].[ext]"
)。您的输出目录“ dist”未知。您可以通过两种方式解决此问题:
publicPath
属性添加到您的输出配置中,该属性指向您的输出目录(在您的情况下为./dist)。例:
output: {
path: PATHS.build,
filename: 'app.bundle.js',
publicPath: PATHS.build
},
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我来说两句