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【workaround】ReactJS中已配置Webpack的publicPath后图片仍无法加载

ReactJS crifan 1663浏览 0评论

折腾:

【基本解决】ReactJS的项目如何打包发布

期间,

问题其实是:

对于

less的css中的图片:

background: url(/assets/ei_up.png) no-repeat;

在开发环境中是

(地址是:http://localhost/xxx)

可以正常加载的。

但是在生产环境中,由于url中加了前缀/uapp/,地址是:

http://116.62.25.57/uapp/xxx

图片的地址就还是之前的:

http://116.62.25.57/assets/ei_up.png

而不是希望的:

http://116.62.25.57/uapp/assets/ei_up.png

从而导致图片无法加载显示了。

细节是:

已经配置了:

webpack.config.babel.js

module.exports = {
  context: path.resolve(__dirname, "src"),
  entry: [‘babel-polyfill’, ‘./index.js’],
  output: {
    path: path.resolve(__dirname, "build"),
    // publicPath: ‘/’,
    publicPath: ‘/ucowsapp/’,
    // publicPath: ‘./ucowsapp/’,
    filename: ‘bundle.js’
  },

但是结果还是部分的image图片加载不出来:

 

对应着css中的:

对应使用的是css中的url:

    background-image: url(/assets/loading.jpg);

和:

img sr:

<img src="/assets/top01.jpg" />

但是,其他的图片,比如:

底部的tab图片,却是可以加载出来的:

对应的是使用的是require:

  globalTabbar: [{
    text: ‘首页’,
    icon: [
      require(‘../assets/b_icon01.png’),
      require(‘../assets/b_icon01b.png’)
    ],
    active: true,
    href: ‘/’
  },

对于:

assets/top01.jpg

的问题,去看了看:

去试试,改一下:

      // publicPath: ‘/’
      publicPath: ‘/app/’

结果生成的图片还是没有加上对应的前缀:

output.publicPath

webpack publicPath assets still can not find image

How to deal with relative public path · Issue #46 · webpack-contrib/file-loader

Loading assets (like images) by url with webpack · Issue #62 · jedwards1211/meteor-webpack-react

publicPath parameter doesn’t work? · Issue #246 · webpack-contrib/extract-text-webpack-plugin

node.js – webpack css-loader not finding images within url() reference in an external stylesheet – Stack Overflow

去换成:

    // publicPath: ‘/’,
    // publicPath: ‘/uapp/’,
    publicPath: ‘./uapp/’,

试试效果。

但是根据:

javascript – What does "publicPath" in webpack do? – Stack Overflow

的解释,此处的设置:

/uapp/

应该是可以的,可以使得:

代码中的:

<img src="/assets/top01.jpg" />

会被自动解析到:

http://116.62.25.57/uapp/assets/top01.jpg

但是此处却没有。

参考:

javascript – Webpack outputs wrong path for images – Stack Overflow

node.js – webpack css-loader not finding images within url() reference in an external stylesheet – Stack Overflow

How to deal with relative public path · Issue #46 · webpack-contrib/file-loader

去把:

      {
        test: /\.(svg|woff2?|ttf|eot|jpe?g|png|gif)(\?.*)?$/i,
        use: ENV===’production’ ? ‘file-loader’ : ‘url-loader’
      }

改为:

      // {
      //   test: /\.(svg|woff2?|ttf|eot|jpe?g|png|gif)(\?.*)?$/i,
      //   use: ENV===’production’ ? ‘file-loader’ : ‘url-loader’
      // }
      {
        test: /\.(svg|woff2?|ttf|eot|gif)(\?.*)?$/i,
        use: ENV===’production’ ? ‘file-loader’ : ‘url-loader’
      },
      {
        test: /\.(jpe?g|png)(\?.*)?$/i,
        use: ENV===’production’ ? ‘file-loader?name=uapp/[name].[ext]’ : ‘url-loader’
      }

但是错误依旧:

GET http://116.62.25.57/assets/loading.jpg 404 (Not Found)
top02.jpg:1 GET http://116.62.25.57/assets/top02.jpg 404 (Not Found)
top01.jpg:1 GET http://116.62.25.57/assets/top01.jpg 404 (Not Found)

不过发现了:

build时会多生成对应的目录:

此处的设置感觉有问题:

把之前的:

/assets/top01.jpg

改为了:

/ucowsapp/top01.jpg

而不是所希望的:

/ucowsapp/assets/top01.jpg

感觉是需要:

加上完整的相对路径。

webpack publicPath assets not find image

deploy webpack img src not load

javascript – How to load image files with webpack file-loader – Stack Overflow

Can’t import image from src · Issue #585 · facebookincubator/create-react-app

reactjs deploy image not load

How to Correctly Set Up Webpack Image Loader in your Node app | David Meents

<img src="/assets/top02.jpg" />

改为:

<img src={require("../../../assets/top02.jpg")} />

试试

结果打包出错:

ERROR in ./container/main/index.js
Module not found: Error: Can’t resolve ‘../../../assets/top01.jpg’ in ‘/Users/crifan/dev/dev_root/daryun/Projects/奥拓/奶牛云/sourcecode/ucowsapp/ucowsapp/src/container/main’
@ ./container/main/index.js 155:37-73 157:37-73
@ ./container/app.js
@ ./index.js
@ multi babel-polyfill ./index.js

如果不行,待会再参考:

javascript – Correct path for img on React.js – Stack Overflow

换成import:

import top01 from ‘../../../assets/top01.jpg’;
          <img src={top01} />
          <img src="/assets/top02.jpg" />
          <img src={top01} />
          <img src="/assets/top02.jpg" />

试试貌似是可以的

再去试试:

import top01 from ‘../../assets/top01.jpg’;
import top02 from ‘../../assets/top02.jpg’;
          <img src={top01} />
          <img src={require("../../assets/top02.jpg")} />
          {/*<img src="/assets/top02.jpg" />*/}
          <img src={require("../../assets/top01.jpg")} />
          <img src={top02} />

结果都是可以正常加载图片的:

然后现在还剩下:

对应的代码是:

    background-image: url(/assets/loading.jpg);
    background: url(/assets/ei_up.png) no-repeat;
    background: url(/assets/seek_i.png) #fff 0.16rem center no-repeat;
    background: url(/assets/to_right_i.png) no-repeat;

即:

都是css中的background或background-image中的url中设置的图片。

reactjs css background image not show on production

reactjs css image production

reactjs – React & Webpack: Loading and displaying images as background-image – Stack Overflow

javascript – ReactJS app can’t load background image – Stack Overflow

javascript – How can I load image(s) used in sass stylesheet in webpack? – Stack Overflow

react js css background image not show on production

Not clear how to include images in my application · Issue #250 · chentsulin/electron-react-boilerplate

react js css less background image

reactjs  生产环境 css url background image

webpack file-loader 解析 css 文件中 background-image路径问题。_CSS_前端开发_INFOCOOL.NET

去把名字改为:

[path][name].[ext]

还是不行。

[译] Webpack——令人困惑的地方 – dmyang – SegmentFault

webpack file-loader 解析 css 文件中 background-image路径问题。_CSS_前端开发_INFOCOOL.NET

Loading Images

加载 LESS 和 SASS | React Webpack 小书

How to Correctly Set Up Webpack Image Loader in your Node app | David Meents

css – React: background image not loading when deployed to server – Stack Overflow

javascript – Correct path for img on React.js – Stack Overflow

Can’t import image from src · Issue #585 · facebookincubator/create-react-app

javascript – How to load image files with webpack file-loader – Stack Overflow

javascript – What does "publicPath" in webpack do? – Stack Overflow

reactjs – Serving static images with Webpack – Stack Overflow

javascript – Webpack outputs wrong path for images – Stack Overflow

deploy webpack img src not load

node.js – webpack css-loader not finding images within url() reference in an external stylesheet – Stack Overflow

publicPath parameter doesn’t work? · Issue #246 · webpack-contrib/extract-text-webpack-plugin

How to deal with relative public path · Issue #46 · webpack-contrib/file-loader

Loading assets (like images) by url with webpack · Issue #62 · jedwards1211/meteor-webpack-react

css-loader

【整理】CSS中的LESS和SASS

【总结】

其实最后还是没有真正解决问题。

只不过是,利用less的语法,部分的缓解了此问题:

webpack.config.babel.js

中,对于为了生产环境中可以正常加载bundle.js等资源,所以设置了:

publicPath: ‘/uapp/‘

即:

module.exports = {
  context: path.resolve(__dirname, "src"),
  entry: [‘babel-polyfill’, ‘./index.js’],
  output: {
    path: path.resolve(__dirname, "build"),
    // publicPath: ‘/’,
    publicPath: ‘/uapp/’,
    // publicPath: ‘./uapp/’,
    filename: ‘bundle.js’
  },

导致了,开发环境中,想要正常运行,也要设置:

  devServer: {
    port: process.env.PORT || 8080,
    host: ‘localhost’,
    // publicPath: ‘/’,
    publicPath: ‘/uapp/’,

这就导致了一个问题:

对于上面的那些less的css中的background(或background-image)中url的图片值来说:

如果从:

    background-image: url(/assets/loading.jpg);

写成:

    background-image: url(/uapp/assets/loading.jpg);

则会导致:

生产环境production中可以正常加载图片,但是开发环境development中无法加载

最后使用less的语法,定义了一个变量,在

npm run build

打包生产环境时,设置为/uapp/

npm run dev

之前,设置为””

具体代码为:

ucowsapp/src/style/variables.less

// @env-prefix: "/uapp";
@env-prefix: "";

其他代码中调用:

ucowsapp/src/container/abnormal-management/style.less

@import "../../style/variables.less";
.nn_list_tit a.px_c i.zx {
    // background: url(/assets/ei_up.png) no-repeat;
  // background: url(/uapp/assets/ei_up.png) no-repeat;
    background: url("@{env-prefix}/assets/ei_up.png") no-repeat;
    background-size: 0.2rem 0.2rem;
}
.nn_list_tit a.px_c i.dx {
    // background: url(/assets/ei_down.png) no-repeat;
    // background: url(/uapp/assets/ei_down.png) no-repeat;
    background: url("@{env-prefix}/assets/ei_down.png") no-repeat;
    background-size: 0.2rem 0.2rem;
}

如此,以最少的改动,基本上实现了动态适配路径了。

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