Max Consecutive Ones

Given a binary array, find the maximum number of consecutive 1s in this array。

var findMaxConsecutiveOnes = function(arr) {    var num = 0;    var res = 0;    for(var i = 0; i < arr.length;i++){        if(arr[i] == 1){            num += 1;            res = Math.max(num,res);        }else{            num =0;        }    }    return res};