webpack 如何从外部 url 导入 [英] how does webpack import from external url

问题描述

我正在使用 webpack 来管理我的 React 应用程序.现在我想从这个 url 导入依赖项:

I am using webpack to manage my react application. Now I want to import a dependency from this url:

<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=gNO2wKVBNupZfafi0bl0sW3dIKqAHn4l">

传统上我只是将上面的代码放在我的 index.html 文件中.但是现在我怎样才能让 webpack 加载这个 url?以及我的 react js 如何使用该依赖项?

traditionally I just put above code on my index.html file. But now how can I let webpack to load this url? And how my react js use that dependency?

当我启动 webpack-dev-server 时，我会得到以下错误:

when I launch webpack-dev-server, I will get below error:

ERROR in Entry module not found: Error: Cannot resolve module 'http://api.map.baidu.com/api'

然后我使用小加载器来加载 url.下面是使用 loader 的 javascript 代码:

Then I use little loader to load the url. Below is the javascript code to use loader:

import $ from 'jquery'
import React from 'react';
import ReactDOM from 'react-dom';
import load from 'little-loader';

import './main.css';
import './component';
import Search from './search/search'

load('http://api.map.baidu.com/api?v=2.0&ak=gNO2wKVBNupZfafi0bl0sW3dIKqAHn4l', function(err){
    console.log('err:', err);
});

// document.body.appendChild(component());


ReactDOM.render(<Search />, document.getElementById('search'));

但是我在启动 webpack 时仍然出现以下错误:

but I still got below error when launch webpack:

ERROR in Entry module not found: Error: Cannot resolve module 'http://api.map.baidu.com/api' in /Users/yzzhao/dev/react-demo/webpack_demo

推荐答案

将来你应该可以通过 System.import 使用动态需求.Webpack 2 将原生支持它们.

In the future you should be able to use dynamic requires via System.import. Webpack 2 will support them natively.

System.import('<url>')
  .then(function() {
    console.log('Loaded!');
  });

如果您不想等待，可以使用脚本加载库.

If you don't want to wait for it, you could use a script loading library.

示例:

安装:

npm install little-loader --save

使用:

import load from 'little-loader';

load('<url>', function(err){

})

或者手动操作

function load(url) {
  return new Promise(function(resolve, reject) {
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.async = true;
    script.src = url;
    script.onload = resolve;
    script.onerror = reject;
    document.head.appendChild(script);
  })
}

load('<url>')
  .then(function() {
    console.log('Loaded!');
  })
  .catch(function(err) {
    console.error('Something went wrong!', err);
  })

这篇关于webpack 如何从外部 url 导入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！