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window.isset = function(v_var) {
  if(typeof(v_var) == 'number'){ if(isNaN(v_var)){return false;}}
	if(typeof(v_var) == 'undefined' || v_var === null){return false;}
	return true;
};

// if( typeof(v_var) == 'undefined' )
// or
// if( v_var === [][[]] )

//Console TEST
console.log('TEST:');

var v_1 = 1;
if(isset(v_1)){
  console.log('isset true');
}

var v_2 = '1';
if(isset(v_2)){
  console.log('isset true');
}

var v_3 = 'abc-абв';
if(isset_test(v_3)){
  console.log('isset true');
}

var v_4 = ['a', 'b'];
if(isset(v_4)){
  console.log('isset true');
}

var v_5 = {'1':'a'};
if(isset(v_5)){
  console.log('isset true');
}

var v_6; //=undefined;
if(!isset(v_6)){
  console.log('isset false');
}

var v_7 = Math.sqrt(-1); //=NaN
if(!isset(v_7)){
  console.log('isset false');
}