function mosaicZero(var num) {    //根據(jù)num拼接字符串zero,數(shù)字num是幾字符串zero就有幾個(gè)0.num取值范圍0-16    var zero = "";    if (num == 0) zero = "0";    if (num == 1) zero = "00";    if (num == 2) zero = "000";    if (num == 3) zero = "0000";    if (num == 4) zero = "00000";    if (num == 5) zero = "000000";    if (num == 6) zero = "0000000";    if (num == 7) zero = "00000000";    if (num == 8) zero = "000000000";    if (num == 9) zero = "0000000000";    if (num == 10) zero = "00000000000";    if (num == 11) zero = "000000000000";    if (num == 12) zero = "0000000000000";    if (num == 13) zero = "00000000000000";    if (num == 14) zero = "000000000000000";    if (num == 15) zero = "0000000000000000";    if (num == 16) zero = "00000000000000000";    return zero;}