这是报错Can't resolve 'vue-router(找不到路由模块)

main.js

import Vue from 'vue'
import VueRouter  from 'vue-router';
import App from './App.vue';

Vue.use(VueRouter)
import routes from './routers.js'

//创建router实例
const router = new VueRouter({
  //mode指定路由模式，默认'hash'，另一种可选的模式是'history'
  mode: 'hash',
  routes,
});

new Vue({
  el: '#app',
  router,
  render: h => h(App) //用render函数渲染引入的组件App.vue到index.html中的#application元素中
})

package.json

{
  "name": "router",
  "description": "A Vue.js project",
  "version": "1.0.0",
  "author": "david",
  "private": true,
  "scripts": {
    "dev": "cross-env NODE_ENV=development webpack-dev-server --open --hot",
    "build": "cross-env NODE_ENV=production webpack --progress --hide-modules"
  },
  "dependencies": {
    "vue": "^2.3.4"
  },
  "devDependencies": {
    "css-loader": "^0.26.1",
    "html-loader": "^0.4.5",
    "quick-local-ip": "^1.0.7",
    "vue-loader": "^10.0.2",
    "vue-template-compiler": "^2.1.8",
    "webpack": "^2.6.1",
    "webpack-dev-server": "^2.4.2",
    "weex-builder": "^0.2.6",
    "weex-loader": "^0.4.1"
  },
  "main": "webpack.config.js",
  "license": "ISC"
}

看到了吗,dependencies里面只有vue模块,我们所需的vue-router模块并未注入；
所以，报错是必然的；
依赖注入

//初始化package.json
npm init

//安装vue的依赖
npm install vue --save
npm install vue-router --save

//安装webpack的开发依赖
npm install webpack --save-dev

//安装babel的ES6 Loader 的开发依赖
npm install babel --save-dev
npm install babel-core --save-dev
npm install babel-loader --save-dev
npm install babel-preset-es2015 --save-dev

//安装html loacer 的开发依赖
npm install html-loader --save-dev