how to create GUID formate in javascript

its easy to make guid in javascript. below is code to get strings that look like guid.

example:

function JSGuid() {

  var output, i, j;

  output = '';

  for(j=0; j<32; j++) {

    if( j == 8 || j == 12 || j == 16 || j == 20) 

      output = output + '-';

    i = Math.floor(Math.random()*16).toString(16).toLowerCase();

    output = output + i;

  }

  return output;

}

JSGuid();

note:  it generate hexadecimal digits separated by a hyphen