一个纯JavaScript CSS选择器引擎：Sizzle
Sizzle是 jQuery作者John Resig新写的DOM选择器引擎，速度号称业界第一。而且有一个重要的特点就是Sizzle是完全独立于jQuery的，如果你不想用jQuery,可 以只用Sizzle。非常好用的，压缩后才3K多点。
特性：
- Completely standalone (no library dependencies)
- Competitive performance for most frequently used selectors
- Only 4KB minified and gzipped
- Highly extensible with easy-to-use API
- Designed for optimal performance with event delegation
- Clear IP assignment (all code held by the Dojo Foundation, contributors sign CLAs)
Selector Features
- CSS 3 Selector support
- Full Unicode support
- Escaped selector support
#id\:value - Contains text
:contains(text) - Complex :not
:not(a#id) - Multiple :not
:not(div,p) - Not attribute value
[name!=value] - Has selector
:has(div) - Position selectors
:first,:last,:even,:odd,:gt,:lt,:eq - Easy Form selectors
:input,:text,:checkbox,:file,:password,:submit,:image,:reset,:button - Header selector
:header
Code Features
- Provides meaningful error messages for syntax problems
- Uses a single code path (no XPath)
- Uses no browser-sniffing
- Caja-compatible code
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