To 5: Again, javascript can check what browser (or what client software in general) requestet the page it is loaded in. Older browser may have to be dealt with trought some seperate handling in your code. To 3: Since Javascript is implemented by the browser, this really depends on what browsers you want to develop code for. So, if you seriously want to learn it and write clean code, then IMHO you have to first get familiar with the ECMAScript standard. Every browser can (and a lot do) implement it’s own methods. The big difference is, that Javascript actually only exists within the Browser, saying, it is by no means a standard in itself. Derived in a sense, that it implements the standard.

😀 Whereas Javascript is derived from ECMAScript. It is important to understand, that ECMAScript is a standard, defined in the last century. Using a library like jQuery is useful to avoid dealing with some of the compatibility problems between browsers. (Note that all Microsoft documentation is there, not only JScript, so for example you would need to search for “jscript array” rather than just “array”.) JScript is documented at the Microsoft Developer Network, and has similar information about support. For each method and property you can find which version it is supported in. One reference is the Mozilla Developer Network, as Mozilla is the current developer of Javascript. Generally you just use what’s supported a few versions back, so that it works in all the browsers that are still in use. The implementations of Javascript and JScript differ somewhat in what they support, but each version supports what’s in the corresponding version of the ECMAScript standard. So, it’s just one language, with different implementations.

JScript is Microsoft’s name of their own implementation.ĮCMAScript is the name of the language standard developed by ECMA, from the original Javascript implementation. Javascript is the original name when the language was developed by Netscape.

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