to extract with switch to advanced mode

I want to display the value for $1$ and $2$
i did in function Javascipt
var myVar1 = context.variableManager.getValue("Sc01_Ext_test_1");
var myVar2 = context.variableManager.getValue("Sc01_Ext_test_2");
var myVar3 = context.variableManager.getValue("Sc01_Ext_test1");
var myVar4 = context.variableManager.getValue("Sc01_Ext_test2");

logger.debug("ComputedValue="+myVar1);
logger.debug("ComputedValue="+myVar2);
logger.debug("ComputedValue="+myVar3);

But the result is always null how I can do to have the value of 1 and 2 separate?
thanks