//var a = new Array(5,"5",3,false,4,5,undefined,9)
//a.indexOf(5);
0
//a.indexOf(5, 1);
5
//a.indexOf(5, 2);
5
//a.indexOf(5, 6);
-1
//a.indexOf(5, 10);
-1
//a.indexOf(true);
-1
//a.indexOf(undefined);
6
//a.indexOf("5");
1
