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AS 发展小计

2008-11-08 11:21 176 查看

2000 -- 2003: ActionScript 1.0, 和 Flash 5.0 一起发布；变成可文本编辑（以前是从对话框和下拉菜单中选择，当然，那个时候不叫 AS）添加 switch 语句和 strict equality 操作；
2003 -- 2006: ActionScript 2.0 和 Flash MX 2004 and Flash Player 7 一起发布；Therefore, ActionScript 2.0 featured compile-time type checking and class-based syntax, using the keywords class and extends, for example.
2006 -- today ActionScript 3.0 首次和 Adobe Flex 2.0 and Flash Player 9 发布。加入的新特性使它变得更加强大：

Compile-time and runtime type checking—type information exists at both compile-time and runtime
Improved performance from a class-based inheritance system that was separate from the prototype-based inheritance system
Support for packages, namespaces, and regular expressions
Compilation to an entirely new type of bytecode, incompatible with ActionScript 1.0 and 2.0 bytecode
A revised Flash Player organized into packages
Unified event handling system that is based on the DOM event handling standard
Integration of ECMAScript for XML (E4X) for the purpose of XML processing
Direct access to the Flash runtime display list for complete control of what gets displayed at runtime
A completely conforming implementation of the ECMAScript Fourth Edition Draft specification
Backward compatibility

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