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
};