js查询重复字符串

        var arr = "1111";
        var count = 0;
        var czarr = "";
        for (var i = 0; i < arr.length; i++) {
            for (var o = 0; o < arr.length; o++) {

                console.log(parseInt(arr.charAt(i)) + ":" + parseInt(arr[o]))

                if (parseInt(arr.charAt(i)) == parseInt(arr[o])) {
                    count++;
                }
            }
            console.log(count)

            if (count > 1) {
                czarr += arr.charAt(i);
            }
            count = 0;

        }
        console.log("---------")
        console.log(czarr)

                    var bool = true;
                    var text = "01 02 02";
                    var arr = text.split(" ");
                    var czarr = "";
                    for (var i = 0; i < arr.length; i++) {
                        var arri = parseInt(arr[i]);
                        if (arri >= limit_min && arri <= limit_max) {
                            for (var o = 0; o < arr.length; o++) {
                                if (i != o) {
                                    var arro = parseInt(arr[o]);
                                    if (arri == arro) {
                                        count++;
                                        czarr += arri + " ";
                                    }
                                }
                            }
                        } else {
                            bool = false;
                            break;
                        }
                    }
                    if (bool) {
                        return count;
                    } else {
                        return 1;
                    }