SOURCE

var globalVariable1=0;

function test1(){
    document.write("localVariable1:"+localVariable1+"<br/>");
    var localVariable1=2;
    document.write(localVariable1+"<br/>");
}

document.write("globalVariable2:"+globalVariable2+"<br/>");

test1();

var globalVariable2=1;

function test2(){
    var localVariable2=3;
}
test2();
document.write("globalVariable2:"+globalVariable2+"<br/>");