简单Popover脚本无法运行：Uncaught ReferenceError: $未定义求助

Hey there! That error is super common when jQuery isn't properly set up before your script runs. Let's break down what's happening and how to fix it:

• Verify jQuery is included in your page
  You need to add a reference to jQuery before your popover script executes. If using a CDN, add this snippet either in your <head> section or right before the closing </body> tag:

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  

  If hosting jQuery locally, double-check the file path in the src attribute—typos here are a frequent culprit.

• Correct your script load order
  The error occurs because your custom popover script runs before jQuery finishes loading. Always place your popover script after the jQuery include. Example:

  <!-- Load jQuery first -->
  <script src="path/to/jquery.min.js"></script>
  <!-- Then load your popover script -->
  <script src="path/to/your-popover-script.js"></script>
  

• Switch to vanilla JavaScript (optional)
  If you don't want to depend on jQuery, replace the problematic line with vanilla JS's DOMContentLoaded event (it fires earlier than window.onload and waits only for the DOM to be ready):

  window.addEventListener('DOMContentLoaded', function() {
    // Your popover logic goes here
  });
  

• Resolve alias conflicts (if applicable)
  If other libraries (like Prototype) are using $ as an alias, use jQuery's noConflict mode to avoid clashes:

  jQuery.noConflict();
  // Use jQuery instead of $ in your code moving forward
  jQuery(window).load(function() {
    // Your popover code here
  });
  

内容的提问来源于stack exchange，提问作者Ehi