Web站点的开发者来说，HTML的发展是一件好坏参半的事。在万维网发展的早期，HTML
相当简单，很容易就能够掌握设计网页所需知道的一切。
随着 Web 的发展，页面设计人员还希望他们的页面能够与用户进行交互，HTML 很快就显得不
足以满足这一需求了。Netscape 发明了 Javascr ipt，作为控制浏览器和给网页添加活力和交互性的方法。
自从诞生以来，Javascr ipt 已经经历了不小的演化（尽管有时候在不同的浏览器上演化的方向有
所不同）。在本书后面，我们将详细讨论 Javascr ipt 的演化。(The development of HTML is a good and bad thing for the developers of Web sites. In the early days of the development of the world wide web, HTML
It's quite simple, and it's easy to get everything you need to know about designing a web page.
With the development of Web, page designers also want their pages to interact with the user, and HTML quickly appears to be out of the question.
Enough to meet this demand. Netscape invented Javascr ipt as a way to control browsers and add vitality and interactivity to web pages.
Since its birth, Javascr ipt has experienced a little evolution (although sometimes on different browsers.
Different). After this book, we will discuss the evolution of Javascr ipt in detail.)