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Chapter 1. Introduction to JavaScript > What Versions? What Browsers?

1.5. What Versions? What Browsers?

When a user receives a page that includes JavaScript, the script is sent to the JavaScript interpreter, which executes the script. Since each browser has its own interpreter, there are often differences on how the code will be executed. And as the competing companies improve and modify their browsers, new inconsistencies may occur. There are not only different types of browsers to cause the incompatibilities but also different versions of the same browser.

1.5.1. Versions

JavaScript has a history. Invented by Netscape, the first version was JavaScript 1.0. It was new and buggy and has long since been replaced by much cleaner versions. Microsoft has a scripting language comparable to JavaScript called JScript. The Table 1.2 lists versions of both JavaScript and JScript.


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