JavaScript is a descriptive language, it can be embedded in html documents.    JavaScript can be done through user response to the demand (such as form input), so that when a user enter a message, it does not need to send through the network server-side processing再传return process, and can be directly in the client handle the matter.    You can also have an executable program Xiangxiangcheng your client on the implementation of the same (but the implementation of such procedures is limited, its client computers controlling power in the poor)! 

  JavaScript and Java is very similar, but they are completely different from the language! Java was developed by Sun Microsystem's an object-oriented programming language, like C, it needs a variety of compilers and supporting documents to run, but The difference is that in C, Java can be independent of any operating platform, it all in today's Internet network on the basis of operating platforms to develop rapidly.    But it is a much more complex than the standard JavaScript programming language.    JavaScript is relatively easy to understand the function of language, JavaScript creators can be less emphasis on programming skills, such as declarations of all the variables, classes and methods, you do not have to concern such as public, private or protected like puzzling things more important is that it can only exist in an HTML script, but only into a compatible browser to run, many of the characteristics of Java in JavaScript does not support.    Now, JavaScript divided into three categories: core version, the client side and server side JavaScript, in this tutorial, I just involves the client JavaScript 1.3, it is fully compatible with the standard ECMA-262 (European Computer Manufacturing Association JavaScript standards); you For more information, please refer to the Netscape Netscape JavaScript presentation (JavaScript, Microsoft has a variant, known as JScript, which I will be introduced at a later time).    Currently on the Internet, many written JavaScript code for your reference, the site will also continue to improve its conduct and development. 

  Applet is a small procedure, it needs compiler can be implemented.    Is a CLASS.