配置RequireJS 2.3.5+jQuery3.2+Bootstrap3.3.7遇错误求解决方案

Hey Marcus, let's work through these issues one by one—these errors are super common when setting up RequireJS with jQuery and Bootstrap, so we'll get your environment running smoothly.

1. Fixing the SyntaxError: expected expression, got '<' Errors #

This error almost always means your browser is trying to parse HTML content as JavaScript. Here are the most likely causes and fixes:

• Missing or incorrect file extension in CDN path: Your jQuery path is set to "//ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min"—you're missing the .js suffix. Some CDNs don't handle requests without the extension and return a 404 HTML error page instead of the JS file. Update it to jquery.min.js:

  jquery: "//ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"
  

• Invalid Bootstrap path: The truncated "bootstrap": "bootstrap.mi..." suggests you probably meant bootstrap.min.js. Double-check:
  • Is the Bootstrap JS file actually located in your lib/js directory (matching your baseUrl)?
  • Did you typo the filename (e.g., missing .js or using the wrong minified filename)?
• Incorrect baseUrl: Make sure lib/js is the correct relative path from your main HTML file. For example, if your HTML is in the root folder, lib/js should be a subfolder containing your local JS files.

2. Resolving the TypeError: $ is not a function Error #

Since you know this stems from jQuery not loading, let's lock in proper dependencies and module handling:

• Shim Bootstrap for RequireJS: Bootstrap isn't an AMD module, so you need to tell RequireJS it depends on jQuery. Add a shim section to your config:

  requirejs.config({
    baseUrl: "lib/js",
    paths: {
      jquery: "//ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js",
      bootstrap: "bootstrap.min.js"
    },
    shim: {
      'bootstrap': {
        deps: ['jquery'], // Ensures jQuery loads first
        exports: '$.fn.bootstrap' // Optional: Marks Bootstrap's exported object
      }
    }
  });
  

• Load dependencies correctly: Always include jQuery as a dependency in your modules before using $:

  require(['jquery', 'bootstrap'], function($) {
    // Safely use $ here since jQuery is loaded
    $(document).ready(function() {
      console.log("jQuery and Bootstrap loaded successfully!");
    });
  });
  

• Test locally first: If CDN issues are suspect, download jQuery 3.2.1's minified file to your lib/js folder, then update the jQuery path to a local file:

  jquery: "jquery.min.js"
  

  This will rule out network or CDN-related problems.

3. Debugging Checklist #

• Check Network Requests: Open your browser's DevTools (F12) → Network tab. Refresh the page and verify:
  • jQuery and Bootstrap return a 200 OK status (not 404 or 403).
  • The response content for each is valid JavaScript (not HTML).
• Verify File Integrity: Ensure your local Bootstrap JS file isn't corrupted—re-download it from the official source if needed.
• Protocol Consistency: If your page uses HTTPS, make sure the CDN path uses https:// (or the // protocol-relative path, which should auto-adapt).

内容的提问来源于stack exchange，提问作者Marcus