This code also demonstrates one way to specify arguments to a callback: as an anonymous list, with a reference to the callback invoked as the first element, followed by the required parameters.
此代码还举例说明了指定回调的参数的一种方法：作为一个匿名列表，具有到作为第一个 参数的回调的引用，随后是所需的参数。
The property will contain a value that is a reference number for the code list.
该属性所包含的值是代码列表的引用编号。
Simple mail list multiple user registered version, database programming source code, a good reference.
说明：简易通讯录多用户注册版，数据库编程源码，很好的参考资料。
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