What are the best practices for loading file content into JavaScript variables for use in frontend interactions?

When loading file content into JavaScript variables for frontend interactions, it is important to use AJAX requests to fetch the file content asynchronously. This ensures that the page does not freeze while waiting for the file to load. Once the content is fetched, it can be stored in a JavaScript variable for use in frontend interactions. ```javascript // Using AJAX to load file content into a JavaScript variable var fileContent; var xhr = new XMLHttpRequest(); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { fileContent = xhr.responseText; // Perform frontend interactions using the file content } }; xhr.open('GET', 'file.txt', true); xhr.send(); ```