Before the Ajax appears, JavaScript is rarely utilized in the traditional Web applications, and under most circumstances developers have to face up to procedure-oriented programming. So, real advanced JavaScript developers are also rare. But nowadays, with the share of the rich client Web applications becoming larger and larger, the role of JavaScript is becoming more and more outstanding and important. How to the reuse the existing JavaScript code and deal with the changing of requirements becomes the urgent problem that every JavaScript developer has to take into account. The popular design patterns put forward by GoF (Erich Gamma, Richard Helm, Ralph Johnson, and John M. Vlissides) are welcomed by developers all over the world. As for the JavaScript field, these design patterns applies in the similar way. In this article I will show you how to apply the six popular design patterns from GoF to the JavaScript programming area by related samples.

Now, let us delve into these interesting patterns one-by-one.