在传统的Web 开发模式中，Javascr ipt 是一种点缀的作用，完成很有限的功能，诸如表 单验证之类。其语言本身也一直被当作过程化的语言使用，很难完成复杂的功能。而Ajax 的出现使得复杂脚本成为必需的组成部分，这就对Javascr ipt 程序设计提出了新的要求，很 多Ajax 应用开始利用Javascr ipt 面向对象的性质进行开发，使逻辑更加清晰。事实上， Javascr ipt 提供了完善的机制来实现面向对象的开发思想。-In traditional Web development mode, Javascr ipt is a decorative role, completed a very limited function, such as Forms Authentication, and so on. The language itself has been used as a process of language use, it is difficult to complete the complex functions. And the emergence of Ajax makes complex scr ipt to become an integral part of the necessary, which of the Javascr ipt programming has made new demands, a lot of Ajax applications started to use Javascr ipt object-oriented nature of development, so that logic more clearly. In fact, Javascr ipt provides a satisfactory mechanism to achieve the development of object-oriented idea.