在ie6中，以下表达式返回true，这是不正确的，需要多加注意。
页面重定向与url中的hash在不同的浏览器中的表现
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web
访问时url上带有hash(如http://localhost/a.php#test)，重定向到b.php页面时，当前a.php页上hash会被带到b.php页面上，在firefox/opera上测试的效果是如此，但ie6上则直接到b.php页，不会将a.php页上hash值带过来。示例代码：
a.php
difference of string.match and regexp.exec
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javascript
The match() method is the most general of the String regular-expression methods. It takes a regular expression as its only argument (or converts its argument to a regular expression by passing it to the RegExp() constructor) and returns an array that contains the results of the match. If the regular expression has the g flag set, the method returns an array of all matches that appear in the string. For example:
rails module include way
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ruby
以下方式的代码在rails中源码中的相当多见，其中的self.included(base)方法是一个回调方法，当此module被其他名为base的module (或者class) included的时候触发此方法。通过class_eval，include，extend加入了实例方法和类方法到base中，代码划分得很干净。
trap of in_array in php
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php