jQuery: shrink your JavaScript files

摘要

Bandwidth and browser technology are improving to meet the demands of highly JavaScripted applications, but you still need to be concerned with the size of your JavaScript code. There are two main reasons why size is important. First, even if the JavaScript you serve is cached, it still needs to be evaluated by the browser on every request. While other loading actions, such as downloading assets, can be run in parallel, JavaScript evaluation can't. This means that the size of your JavaScript files will have a larger impact on page load time than the size of CSS files or images. Reducing the size of your JavaScript is the only way to reduce the amount of time the browser spends evaluating it.