TAILIEUCHUNG - JavaScript Bible, Gold Edition part 6

JavaScript Bible, Gold Edition part 6. This book will bring programmers and non-technical professionals, including casual programmers and scripters, painlessly up to speed on all aspects of mastering JavaScript. Key topics include programming fundamentals, JavaScript language elements and how to use them effectively, and how to easily and efficiently add powerful new functionality to HTML documents and Java applets. | 14 Part I Getting Started with JavaScript The separation of core language from document objects enables each concept to have its own standards effort and development pace. But even with recommended standards for each factor each browser maker is free to extend the standards. Furthermore authors may have to expend more effort to devise one version of a page or script that plays on both browsers unless the script adheres to a common denominator or uses some other branching techniques to let each browser run its own way . Core language standard Keeping track of JavaScript language versions requires study of history and politics. History covers the three versions developed by Netscape politics covers Microsoft s versions and the joint standards effort. The first version of JavaScript in Navigator 2 was Version although that numbering was not part of the language usage. JavaScript was JavaScript. Version numbering became an issue when Navigator 3 was released. The version of JavaScript associated with that Navigator version was JavaScript . As you will learn later in this book the version number is sometimes necessary in an attribute of the HTML tags that surround a script. The Navigator generation increased the language version one more notch with JavaScript . Microsoft s scripting effort contributes confusion for scripting newcomers. The first version of Internet Explorer to include scripting was Internet Explorer 3. The timing of Internet Explorer 3 was roughly coincidental to Navigator 3. But as scripters soon discovered Microsoft s scripting effort was one generation behind. Microsoft did not license the JavaScript name. As a result the company called its language JScript. Even so the HTML tag attribute that requires naming the language of the script inside the tags could be either JScript or JavaScript for Internet Explorer. Internet Explorer 3 could understand a JavaScript script written for Navigator 2. During this period of dominance by Navigator

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