身份证15位转换18位

/**
 * 
 * @param {*} card   字符串 
 * @returns 
 */

function changeFivteenToEighteen(card) {
    if (card == null || card == "") {
        return true;
    }
    if (card.length == '15') {
        var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
        var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
        var cardTemp = 0, i;
        card = card.substr(0, 6) + '19' + card.substr(6, card.length - 6);
        for (i = 0; i < 17; i++) {
            cardTemp += card.substr(i, 1) * arrInt[i];
        }
        card += arrCh[cardTemp % 11];
        return card;
    }
    return card;
};


// 使用方法
 changeFivteenToEighteen('440135428645127')