function call_apply(x,y) {
 console.log(JSON.stringify(x) +','+JSON.stringify(y));
}

if($.isFunction(call_apply)) {
  console.log('function:');

  // call(thisObject, arg1, arg2, ...)
  call_apply.call(this,
    {user:'user1', pass: 'pass1'},
    {user:'user2', pass: 'pass2'}
  );

  // apply(thisObject, arrayOfArgs)
  call_apply.apply(this, [
    {user:'user1', pass: 'pass1'},
    {user:'user2', pass: 'pass2'}
  ]);
}
else {
 console.log('NO function.');
}