JS JS and is an abbreviation of the IE JavaScript or JScript.

JS JS and is an abbreviation of the IE JavaScript or JScript.
javascript is an open standard scripting language in all browsers
JScript is Microsoft's own open standard scripting language, only Microsoft's IE browser to follow.
Microsoft JScript can be said that the privatization of the product of JavaScript.
Like Microsoft's C / C ++ the same. We all know that VC is not only C / C ++. For those using venture, consider themselves very advanced people, I'm sorry ... ha ha ha.
The JavaScript and JScript is a continuous development and the development of scripting languages, so who is more advanced is beyond doubt, but JScript provides some functionality in some respects, with the popularity of IE, and in many cases has become a real JS significance.
JScript has not been widely heard, literally refers to the script by JS (JavaScript or JScript) written.
Because JScript or JavaScript is a scripting language (ie, script).
Vb vbscript and so there is no difference.
In fact, Web programming is actually for the browser. A typical version of IE, such as 5.0,5.5,6.0,7.0 and 8.0, the future of the Firefox browser, as well as many other browsers (Opera, Safari, KDE Linux environment in Konqueror and not yet officially released the Google browser), the fact that on, most experts are javascript and JScript.
Because all browsers support javascript, but most of them use IE, so now those who are good at multi-browser JS program is very popular, but very tired.
Insiders said that, compared with the two codes compiled separately, at the same time a piece of code modifications for IE and Firefox is much more difficult. This is also true.
Each browser has multiple versions, it is very difficult ...
JavaScript was originally Netscape changed his name to livescript. I do not know if I remember, but that was before the popularity of the Internet. I remember, JavaScript should now managed by the W3C.