Q: JavaScript split function i like to split a string depending on "," character using JavaScript
example  
var mystring="1=name1,2=name2,3=name3";

need output like this
1=name1
2=name2
3=name3


A: Just use string.split() like this:
var mystring="1=name1,2=name2,3=name3";
var arr = mystring.split(','); //array of ["1=name1", "2=name2", "3=name3"]

If you the want string version of result (unclear from your question), call .join() like this:
var newstring = arr.join(' '); //(though replace would do it this example)

Or loop though, etc:
for(var i = 0; i < arr.length; i++) {
  alert(arr[i]);
}

You can play with it a bit here

A: var list = mystring.split(',');

Now you have an array with ['1=name1', '2=name2', '3=name3']
If you then want to output it all separated by spaces you can do:
var spaces = list.join("\n");

Of course, if that's really the ultimate goal, you could also just replace commas with spaces:
var spaces = mystring.replace(/,/g, "\n");

(Edit: Your original post didn't have your intended output in a code block, so I thought you were after spaces. Fortunately, the same techniques work to get multiple lines.)
