มี data แบบ abc,def ต้องการเปลี่ยนให้เป็น abc def ใข้ split อย่างไรคะ?

var data = "abc,def,ghi";
document.write(data.replace(/,/g," "));

var ps = "is,use,das,the,separator,thestring,is,split,between,each,character"; ///not okay//
//ps = document.write("separator, the string is split between");// data with spaces split okay//
var NewSp = new Array();

			//sp1 = document.write(ps.split() +"<br />"); //split okay///
					NewSp = ps.split(","); //okay

				for(i=0;i<NewSp.length;i++)
					{
						document.write("[i] "+NewSp[i] +"<br />");
					}
}