从webpack导入owl.carousel

Question

我是F2E世界的新手.我刚刚使用create-react-app创建了一个Web应用程序.(https://github.com/facebookincubator/create-react-app)

我想将owl.carousel导入到我的项目中,因此我遵循了NPM(https://www.npmjs.com/package/owl.carousel)的指南,其语法是:

import $ from 'jquery';
import 'imports?jQuery=jquery!owl.carousel';

但调试器控制台指出错误:

Unexpected '!' in 'imports?jQuery=jquery!owl.carousel'. Do not use      import syntax to configure webpack loaders import/no-webpack-loader-syntax

我尝试了另一种语法:

import owlCarousel from 'owl.carousel' 

而错误将是:

Uncaught TypeError: Cannot read property 'fn' of undefined

有人可以帮我弄清楚发生了什么吗？谢谢.

更新:我的webpack加载器设置:

loaders: [
  // Process JS with Babel.
  {
    test: /\.(js|jsx)$/,
    include: paths.appSrc,
    loader: 'babel-loader',
    query: {
      cacheDirectory: findCacheDir({
        name: 'react-scripts'
      })
    }
  },
  {
    test: /\.css$/,
    loader: 'style!css?importLoaders=1!postcss'
  },
  {
    test: /\.json$/,
    loader: 'json'
  },
  {
    test: /\.(ico|jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2)(\?.*)?$/,
    loader: 'file',
    query: {
      name: 'static/media/[name].[hash:8].[ext]'
    }
  },
  {
    test: /\.(mp4|webm|wav|mp3|m4a|aac|oga)(\?.*)?$/,
    loader: 'url',
    query: {
      limit: 10000,
      name: 'static/media/[name].[hash:8].[ext]'
    }
  }
]

我的组件代码:

import React, { Component } from 'react';
import './App.css';
import './css/style.css';
import './css/bootstrap.min.css';
import './css/owl.carousel.css';
import FruitSelector from './containers/fruit_Selector';
import FruitDetail  from './containers/fruit_Detail';
import $ from 'jquery';
import 'owl.carousel';

class App extends Component {
render() {
$(document).ready(function(){

  $(".content-slider").owlCarousel({
      slideSpeed: 350,
      singleItem: true,
      autoHeight: true,
      navigation: true,
      navigationText: ["<i class='fa fa-angle-left'></i>", "<i class='fa fa-angle-right'></i>"]
  });
});

return (
  <div className="App">
  <div className="row">
    <div className="col-sm-4 col-md-3 sidebar">
      <FruitSelector/>
    </div>
    <div className="col col-md-8">
        <FruitDetail/>
    </div>
    </div>
  </div>
);
}
}

export default App;

我的webpack.config.dev.js插件设置:

plugins: [

new InterpolateHtmlPlugin({
  PUBLIC_URL: publicUrl
}),

new HtmlWebpackPlugin({
  inject: true,
  template: paths.appHtml,
}),
new webpack.DefinePlugin(env),
new webpack.HotModuleReplacementPlugin(),
// Watcher doesn't work well if you mistype casing in a path so we use
// a plugin that prints an error when you attempt to do this.
// See https://github.com/facebookincubator/create-react-app/issues/240
new CaseSensitivePathsPlugin(),
// If you require a missing module and then `npm install` it, you still have
// to restart the development server for Webpack to discover it. This plugin
// makes the discovery automatic so you don't have to restart.
// See https://github.com/facebookincubator/create-react-app/issues/186
new WatchMissingNodeModulesPlugin(paths.appNodeModules),
new webpack.ProvidePlugin({
      $: "jquery",
      jQuery: "jquery",
      "window.jQuery": "jquery"
  })]

弹出错误:

App.js:71 Uncaught TypeError: (0 , _jquery2.default)(...).owlCarousel is not a function(…)

Answer 1

删除阻止导入语法的插件

问题在于导入语法不是默认的webpack语法.你已经在你的项目中安装了https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-webpack-loader-syntax.md来阻止它,肯定它是反应的一部分-创建应用程序内.请删除它以启用此语法.

Owl.carousel需要jQuery在其中导入库,因为它使用$ variable,所以这是问题,这就是webpack-loader-syntax必须删除的原因.

如果我们尝试以owl标准方式导入然后jQuery没有在那里定义(webpack中的每个文件都有自己的范围),那么它将抛出一个错误:

Uncaught TypeError: Cannot read property 'fn' of undefined

(备选方案)使用匀场模块

如果删除插件有问题那么您可以尝试将jQuery添加到每个模块,并将其用作填充模块 - https://webpack.github.io/docs/shimming-modules.html.

在webpack配置中,它看起来像:

module.exports = {
  plugins: [
    new webpack.ProvidePlugin({
    $: "jquery",
    jQuery: "jquery",
    "window.jQuery": "jquery"
    })
]
//other config vars
};

并添加它:

import 'owl.carousel'