not work indexOf() for array that is from ajax text file data : jQuery version 1.4.4

aaa.txt
includes just 3row
01000
01001
01139

$.ajax({

        url: "aaa.txt", 
        success: function(result){
            console.log(result);
            var rArr = result.split("\n");
            var ee = rArr.indexOf("01001");
            console.log(ee);
        }
});

return -1.
i guess it should return 1.
all the type are string.

i can't understand why this situation happens.
please give me answers you good guys thank you very much. 