校验码

function check(code) {
    code = code.split('');

    var factor = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2],
        parity = [1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2],
        sum = 0,
        ai = 0,
        wi = 0;

    for (var i = 0; i < 17; i++) {
        ai = code[i];
        wi = factor[i];
        sum += ai * wi;
    }

    var last = parity[sum % 11];
    console.log(last)

    return (parity[sum % 11] == code[17]);
}