Is there a way in javascript to scramble numbers where the outcome is consistent?

So I need to be able to scramble numbers around but have the outcome always be consistent. Meaning, if I scrambled 1234 and it gave me something like 2143, if I ran the scramble function again it would result in 2143 again.

Is anyone aware of a way to do this?

Below is my inconsistent scrambling method.

function textScrambler(fieldText) {
    var scramWord = '';
    fieldText = fieldText.split('');
    while (fieldText.length > 0) {
        scramWord += fieldText.splice(fieldText.length * Math.random() << 0, 1);
    }
    return scramWord;
}