[рони]

MrFlatman,

function mass_two() {
        var n = 3,
            m = 5;
        var mas = [];
        var sum = []
        for (var i = 0; i < m; i++) {
            mas[i] = [];
            for (var j = 0; j < n; j++) {
                mas[i][j] = Math.floor(Math.random() * 30) + 1;
                sum[j]= (sum[j]||0) + mas[i][j] * !(mas[i][j] % 2);
            }
        }


        console.log(mas);
        console.log(sum);

    }
mass_two()