Vue 如何import服务器上的js配置文件

背景

项目中有一个本地配置文件：

// src/image-position.js
export default {
    label: '首页',
    value: 'home',
    data: [
      {
        label: '轮播',
        value: 'carousel'
      }
    ]
}

如何引用一个本地文件大家都知道：

import ImagePosition from './image-position.js'

现在需要把image-position.js文件丢到服务器上去，得到它的链接：

xxx.com/static/imag…

这个时候你直接引用文件地址自然是行不通的。

import ImagePosition from 'https://xxx.com/static/image-position.js'

// ERROR This dependency was not found

实现

首先对image-position.js做一点小改造，暴露一个全局对象ImagePosition

// 改造后的image-position.js

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' 
    ? module.exports = factory() 
    : typeof define === 'function' && define.amd 
    ? define(factory) 
    : (global = global || self, global.ImagePosition = factory());
}(this, (function () {
  'use strict';
  
  return {
    label: '首页',
    value: 'home',
    data: [
      {
        label: '轮播',
        value: 'carousel'
      }
    ]
  };
})));

在vue.config.js文件里添加externals。

module.exports = {
  configureWebpack: config => {
    config.externals = {
      'image-position': 'ImagePosition'
   }
  }
}

index.html 区分环境并引入js文件。

// public/index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="renderer" content="webkit">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <title><%= htmlWebpackPlugin.options.title %></title>
  </head>
  <body>
    <div id="app"></div>
    <!-- built files will be auto injected -->
    <% if (NODE_ENV == 'production') { %>
      <script src="http://xxx.com/static/image-position.js"></script>
    <% } else { %>
      <script src="http://test.xxx.com/static/image-position.js"></script>
    <% } %>
  </body>
</html>

结束上面的步骤后就可以愉快的引用image-position.js文件了。

import ImagePosition from 'image-position'
console.log(ImagePosition)
// {label: '首页',value: 'home',data: [{label: '轮播', value: 'carousel'}]}

补充vue-cli2.0下如何配置

// build/webpack.base.conf.js
module.exports = {
  externals: {
    // 新增
    'image-position': 'ImagePosition'
  }
}

// index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="renderer" content="webkit">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <title><%= htmlWebpackPlugin.options.title %></title>
  </head>
  <body>
    <div id="app"></div>
    <!-- built files will be auto injected -->
    <% if (process.env == 'production') { %>
      <script src="http://xxx.com/static/image-position.js"></script>
    <% } else { %>
      <script src="http://test.xxx.com/static/image-position.js"></script>
    <% } %>
  </body>
</html>