Question

Why are there times when you use a ‘,’ vs ‘:’ to separate .CSS parameters?

for example:

$('#example').css("",""); vs. $('#example').css("":"");

I have use in this way.

$('#example').css("color","#000000");
$('#example').css("cursor":"pointer");

Answer 1

The colon is only used when you have to specify multiple values. But then you have to put the values in brackets and curly brackets and separate them by a comma.
For example:

$('#example').css({
  'background-color' : 'yellow',
  'font-weight' : 'bolder'
});

Otherwise, when you only need to set one value, you use the comma:

$('#example').css('background-color','yellow');