1function replacer(key,value)
2{
3    if (key=="privateProperty1") return undefined;
4    else if (key=="privateProperty2") return undefined;
5    else return value;
6}
7
8var x = {
9    x:0,
10    y:0,
11    divID:"xyz",
12    privateProperty1: 'foo',
13    privateProperty2: 'bar'
14};
15
16alert(JSON.stringify(x, replacer));
17