What are the methods for website performance optimization? Specific code examples are required
With the rapid development of the Internet, website performance optimization has become increasingly important. A high-performing website not only improves user experience, but also attracts more visitors and increases conversion rates. This article will introduce some commonly used website performance optimization methods and provide specific code examples to help readers better understand.
Sample code:
CSS file compression:
<IfModule mod_deflate.c> <FilesMatch ".(css)$"> SetOutputFilter DEFLATE </FilesMatch> </IfModule>
JavaScript file compression:
<IfModule mod_deflate.c> <FilesMatch ".(js)$"> SetOutputFilter DEFLATE </FilesMatch> </IfModule>
Merge CSS files:
<link rel="stylesheet" href="style1.css"> <link rel="stylesheet" href="style2.css">
Merge JavaScript files:
<script src="script1.js"></script> <script src="script2.js"></script>
Sample code:
Introducing static resources accelerated by CDN:
<link rel="stylesheet" href="https://cdn.example.com/style.css"> <script src="https://cdn.example.com/script.js"></script>
Sample code:
Use Expires header:
<IfModule mod_expires.c> ExpiresActive On ExpiresDefault "access plus 1 week" </IfModule>
Use Cache-Control header:
<IfModule mod_headers.c> <FilesMatch ".(js|css|jpg|jpeg|png|gif|swf)$"> Header set Cache-Control "max-age=604800, public" </FilesMatch> </IfModule>
Sample code:
Use lazyload plug-in:
<img class="lazy" data-src="image.jpg" alt="Image"> <script src="lazyload.js"></script> <script> var lazyLoadInstance = new LazyLoad({ elements_selector: ".lazy" // 更多配置项可以参考插件文档 }); </script>
Sample code:
Add index:
ALTER TABLE `user` ADD INDEX (`username`);
Use cached query results:
$user = $cache->get('user'); if (!$user) { $user = $db->query('SELECT * FROM user WHERE id = 1')->fetch(); $cache->set('user', $user, 3600); }
In summary, website performance optimization is a An ongoing process. By compressing and merging static resources, using CDN acceleration, properly setting cache, lazy loading and database optimization, the loading speed and performance of the website can be greatly improved. Hopefully, the specific code examples provided in this article will help readers better understand and apply these optimization methods to create high-performance websites.
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