1) $() function is actually a factory for jQuery object. It is the object encapsulates zero or more DOM dlements.
2) .addClass() and .removeClass()
They are fairly self-explanatory.
Its only parameter is the name of the class to add or remove.
Here are two samples.
Sample 1.
$(document).ready(function() {
$('.poem').addClass('emphasized');
});
$('.poem').addClass('emphasized');
});
It is the function to add class 'emphasized' on the class 'poem'.
Sample 2.
$(document).ready(function() {
$('span:contains(language)').addClass('emphasized');
});
$('span:contains(language)').addClass('emphasized');
});
This sample try to find the span which contains "language", and add a class 'emphasized' on these span.
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