Sort Number With Comma Not Work

If sort this work:
var myarray= new Array(10,16,35,"0.1",8,4,22,19,1,22,35,9,26,38,40);

with code
function function1(a,b)
{return a - b}
var order02=new Array();
order02=myarray.sort(function1);

but instead of 0.1 I use 0,1 (with comma) not work;

Is possible to solve?

Further, in the function for to sort, what is the difference
between this
function function1(a,b)
{return a - b}
and this
function function2(a, b) {
if (a b) { return 1; }
if (a == b) { return 0; }
if (a < b) { return -1; }
}

If I use 0.1 they work good both;
If I use 0,1 (with comma)

they work dissimilar (different result) and both whatever not work.