Let the browser not load cached CSS and JS methods

Most browsers now cache pictures, CSS, and JS files on the site to increase load speed. When your site changes CSS and JS, often because caching reasons can not immediately take effect.

Such old CSS and new Html may lead to errors, here is a small trick, you can ensure that the browser will not cache CSS and JS, only to the end of the file with a little bit of parameters, so the browser will think that this is a different file.

The code is as follows	Copy Code
<link rel= "stylesheet" type= "Text/css" href= "/style.css?ver=123"/>

If you use PHP to take the current time as the version number, you will reload each time:

The code is as follows	Copy Code
<link rel= "stylesheet" type= "Text/css" href= "/style.css?ver=<?php" echo Time ();?> "/>"

Of course, this will pay the price, completely break the browser's caching mechanism, resulting in the same time will reload the same CSS and JS

The best solution is to reload the CSS and JS files only when they are modified. To introduce a PHP filemtime () function, the Filemtime () function can return the last time the file was modified, so that the version changes only when the file is modified.

The code is as follows	Copy Code
<?php $css = '/style.css '?> <link rel= "stylesheet" type= text/css "href="? ver=<?php Echo $css. Filemtime ($CSS);?> "/>

Wordpress

If you use WordPress, you can mount the script via the scripting queuing mechanism provided by WordPress:

code is as follows	copy code
$css = get_ Stylesheet_directory (). '/css/style.css '; Wp_enqueue_style (' style ', $css, NULL, Filemtime ($CSS));