[js][填坑] findMissingNumber

#宝宝心里苦啊

            function findMissingNumber(sequence) {
                //                if (typeof sequence != 'string') {
                //                    return 0;
                //                }
                //                if (sequence.replace(/\s+/g, '').length == 0) {
                //                    return 0;
                //                }
                if (!sequence) {
                    return 0;
                }
//                if (/[^\d ]/.test(sequence)) {
//                    return 1;
//                }
                var a = sequence.split(" ");
                if (a.every(function(e, i, arr) {
                        return Number(e);
                        //return /\d/.test(e);
                    })) {
                    for (var n = 1; n < a.length + 1; n++) {
                        if (a.indexOf('' + n + '') < 0) {
                            return n;
                        }
                    }
                    return 0;
                } else {
                    return 1;
                }
            }