无法设置未定义的属性 'bootstrap'

Question

当我使用 npm 安装 bootstrap 时，我运行以下命令：

npm 安装bootstrap
npm 安装popper.js --保存

然后我得到以下目录树：

-node_module
|__bootstrap
|__jquery
|__popper

我用它：

<script type="module" src="<?php echo asset('node_modules/jquery/dist/jquery.min.js') ?>"></script>
<script type="module" src="<?php echo asset('node_modules/popper/dist/popper.min.js') ?>"></script>
<script type="module" src="<?php echo asset('node_modules/bootstrap/dist/js/bootstrap.min.js') ?>"></script>
<link rel="stylesheet" href="<?php echo asset('node_modules/bootstrap/dist/css/bootstrap.min.css') ?>">

但是当我运行它时，它导出一个错误：

Uncaught TypeError: Cannot set property 'bootstrap' of undefined
at bootstrap.min.js:6
at bootstrap.min.js:6

不知道为什么，求助！！我的 packeage.json:

{
  "private": true,
  "scripts": {
    "dev": "npm run development",
    "development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
    "watch": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
    "watch-poll": "npm run watch -- --watch-poll",
    "hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
    "prod": "npm run production",
    "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
  },
  "devDependencies": {
    "axios": "^0.16.2",
    "bootstrap-sass": "^3.3.7",
    "cross-env": "^5.0.1",
    "jquery": "^3.3.1",
    "laravel-mix": "^1.0",
    "lodash": "^4.17.4",
    "vue": "^2.1.10"
  },
  "dependencies": {
    "bootstrap": "^4.1.3",
    "popper.js": "^1.14.4"
  }
}

Answer 1

删除属性 type="module" 它将起作用 - jQuery 和 Bootstrap 在缩小版本中只是普通的 ES5 文件

Answer 2

并从 node_modules/popper.js/dist/umd 目录安装 popper.min.js 以避免以下错误：

`Uncaught SyntaxError: Unexpected token export`

据我所知，popper.min.js 文件的位置也有误。此文件位于

node_modules/popper.js/dist

你有

node_modules/popper/dist

工作示例：

<html lang="en">
 <head>
   <meta charset="utf-8">
   <meta http-equiv="x-ua-compatible" content="ie=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">

   <title>Examplel Bootstrap page</title>

   <link rel="stylesheet" href="node_modules/bootstrap/dist/css/bootstrap.min.css" />

   <script src="node_modules/jquery/dist/jquery.min.js"></script>
   <script src="node_modules/popper.js/dist/umd/popper.min.js"></script>
   <script src="node_modules/bootstrap/dist/js/bootstrap.min.js"></script>
 </head>
 <body>
  <nav class="navbar navbar-dark bg-dark">
    <a class="navbar-brand" href="#">Never expand</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExample01" aria-controls="navbarsExample01" aria-expanded="false" aria-label="Toggle navigation">
   <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbarsExample01">
   <ul class="navbar-nav mr-auto">
     <li class="nav-item active">
    <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
     </li>
     <li class="nav-item">
    <a class="nav-link" href="#">Link</a>
     </li>
     <li class="nav-item">
    <a class="nav-link disabled" href="#">Disabled</a>
     </li>
     <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
    <div class="dropdown-menu" aria-labelledby="dropdown01">
      <a class="dropdown-item" href="#">Action</a>
      <a class="dropdown-item" href="#">Another action</a>
      <a class="dropdown-item" href="#">Something else here</a>
    </div>
     </li>
   </ul>
   <form class="form-inline my-2 my-md-0">
     <input class="form-control" type="text" placeholder="Search" aria-label="Search">
   </form>
    </div>
  </nav>
 </body>

</html>

无法设置未定义的 属性 'bootstrap'

Cannot set property 'bootstrap' of undefined

jquery

bootstrap-4

popper.js

无法设置未定义的属性 'bootstrap'