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Can someone explain how the beginning and end of the html5shim script works?
the script starts with /*@ and ends with @*/like this:
/*@cc_on(function(a,b){function ........ (this,document);@*/
What is the /*@ @*/ doing?
I would expect the /* */ sequence to comment out all lines in between them, but since the script executes, that cant be the case here? I'm confused.
found at:
http://html5shim.googlecode.com/svn/trunk/html5.js
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This is the logical OR operator in JS (and most other languages). It is defined in the spec at 11.11. As noted in the spec, expressions on either side will be evaluated first and the logical OR is left-to-right associative.
Updated on July 03, 2019. The dollar sign ($) and the underscore (_) characters are JavaScript identifiers, which just means that they identify an object in the same way a name would. The objects they identify include things such as variables, functions, properties, events, and objects.
-1, 0, and 1 in a comparison function are used to tell the caller how the first value should be sorted in relation to the second one. -1 means the first goes before the second. 1 means it goes after.
Single line Javascript comments start with two forward slashes (//). All text after the two forward slashes until the end of a line makes up a comment, even when there are forward slashes in the commented text.
IE's JScript supports ‘conditional compilation’, a trick of hiding special browser-specific information in comments. The idea is that /*@...@*/ is such an unusual sequence of characters that it is safe to repurpose it to introduce this new syntax-level feature.
html5shiv uses it to create a piece of code that won't even try to run on most browsers (which, like you did, will interpret the whole thing as a commend), but which has special meaning to IE.
MS doc here. No other JS engine supports this. Typically you might favour more explicit behaviour-sniffing code instead, but if you really need to detect an IE feature that doesn't expose itself to sniffing otherwise, it can be handy.
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It's an IE-ism for "conditional compilation": http://www.javascriptkit.com/javatutors/conditionalcompile.shtml
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