How to decode parameter with space in URL using javascript?

Question

I try to extract parameter from URL, but one parameter has space which is replaced with "+", so the parameter I extract is "iphone+4", but actually it is "iphone 4", how can I convert to the second form, decodeURIComponent does not work here.

Answer 1

function decodeParameter(param) {
   return decodeURIComponent(param.replace(/\+/g, ' '));
}

Answer 2

"iPhone+4".replace("+"," ");  

That should do it?