命名参数与常规参数

Question

I am wondering if there is some difference in performance between javascript's regular parameters

call(var1, var2);

and jQuery style:

call({var1: '1', var2: '2'});

I am using the both depenging on current situation.

Maybe there is some standard?

Thank you

Answer 1

That's not jQuery style , but just a Javascript Object Literal actually.

You choose literals when you have to pass a map of named values, but you don't know which ones and how many will be passed actually, eg jQuery CSS setter:

$(el).css({
  'color' : 'red',
  'font-weight' : 'bold'
});

The function body will take care of inspecting the argument object, and do stuff accordingly

You choose a plain list of arguments [ function(arg1, arg2, ... argN) ] when you possibly know all the parameters needed by the function, and you are able to provide them:

var distance = function(p1, p2){

  // calculate distance between points p1 and p2

}

Answer 2

IMO, It all depends on what your scenario is. If you have var1, var2, ... varN you would obviously either use array or JSON. I do not think there is any issue with the performance.

If I have only one parameter in my function, Why would i want to use json (creation of json might use some resource).