Check whether a CSS class has a particular attribute or not [duplicate]

Question

This question already has answers here:

How to get a style attribute from a CSS class by javascript/jQuery? (8 answers)

Closed 10 years ago.

It might be repeated question but still need of time is that I want a solution. I am new to CSS and jQuery, so here is what I am looking for. I have a css like this

.my-selector { 
 background-size: cover;
 something-here1 : 2;
}

Now I want to check whether this my-selector has backgroud-size as one of the elements or not, if it has then I want to add new element in same selector. This I want to do in JavaScript or using jQuery

Answer 1

btw: jQuery IS javascript.

if (!$(this).hasClass("my-selector")) {
 //rlemons post [link below] deals with this
}

look here for rlemon's anwer for the this part