Possible Duplicate:
When to Use Double or Single Quotes in JavaScript
I’m confusing what I should use in jQuery.
Some use single some use double quotation mark.
For example
$('.class1').removeClass('class1')
$(".class1").removeClass("class1")
Also, alert as well
alert("aa");
alert('aa');
which one is correct?
This is more a matter of preference than correctness. See this question for more details: When to use double or single quotes in JavaScript?