var arr = [1, 1, 5, 2, 4, 5, 5, 3, 5]
var sz = 9;
var mx = -1111111;
var loc=[];
var cnt = 0;

for (var i = 0; i < sz; i++) {
    if (arr[i] < mx)
        continue;

    if (arr[i] == mx) {
        loc.push(i);
        cnt++;
    }
    else {
        mx = arr[i];
        cnt = 1;
        loc=[];
        loc.push(i);

    }

}