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var permArr = [],
  usedChars = [];

function permute(input) {
    var i, ch;
    for (i = 0; i < input.length; i++) {
        ch = input.splice(i, 1)[0];
        usedChars.push(ch);
        if (input.length == 0) {
            permArr.push(usedChars.slice());
        }
            permute(input);
            input.splice(i, 0, ch);
            usedChars.pop();
        }
        return permArr
    };
}