LeetCode palindrome - JavaScript

Title Description

Determine whether an integer is a palindrome. Palindrome correct order (from left to right) and reverse (right to left) reading is the same integer.
method one:

var isPalindrome = function(x) {
    var resultArr, resultNum;
        resultArr = x.toString().split("");
        if(resultArr[0] == "-"){
            return false;
        }
        resultNum = parseInt(resultArr.reverse().join(""));
        if(x == resultNum){
            return true;
        }
        return false;
};

Advanced

Method Two:

var isPalindrome = function(x) {
   var resultArr = x.toString().split("");
   for(var i = 0;i < resultArr.length/2; i++){
    if(resultArr[i] != resultArr[resultArr.length-1-i]){
         return false;
    }
}
return true;
};