看到了篇文章 http://james.padolsey.com/javascript/under-jquerys-bonnet/ 查看jquery的代码实现 http://james.padolsey.com/jquery 做的很cool，如果你想知道jquery的attr方法是怎么实现的 http://james.padolsey.com/jquery/#v=1.4&fn;=jQuery.attr 访问上面的地址即可，比自己从几千行源码里翻要快些。
If there’s one thing all library users should be doing more, it’s peeling back the layer of abstraction and seeing what’s really happening underneath. This is the only way to gain a true understanding of what the library provides, and who knows, maybe you’ll find some gems that you didn’t know existed.
Libraries like jQuery aren’t very small when uncompressed. Traversing a long source file trying to look for a specific method’s implementation is far from ideal. I have frequently found myself in this situation with jQuery, so today I decided to do something about it, and the result is viewable at http://james.padolsey.com/jquery.
It allows you to study specific parts of jQuery’s source. You can type in a method name and you’ll see its implementation straight away, in all its syntax-highlighted glory! It will also link’ify all function names within the presented source:
You can link directly to a method using the following URL pattern:
http://james.padolsey.com/jquery/[version/]methodName E.g. http://james.padolsey.com/jquery/css http://james.padolsey.com/jquery/1.3.2/attr http://james.padolsey.com/jquery/jQuery.proxy -OR- http://james.padolsey.com/jquery/#v=version&fn=methodName
If you don’t specify a version then 1.4 is assumed.
The source that’s shown won’t be identical to the actual source, since this
source viewer only works by toString()‘ing the functions. I might eventually
implement something a little more robust, but it’s going to take time —
finding a specific function’s declaration in a source file is tricky,
especially when they’re not all defined with the straightforward method: function(){...} or function foo(){...}.
I didn’t really intend it to be an accurate depiction of the real source anyway — just something I (and others) could use to see how certain things are implemented within jQuery.
I hope you find it useful… I know I will!