統一社會信用代碼驗證

function CheckSocialCreditCode(Code) {
    var patrn = /^[0-9A-Z]+$/;
    //18位校驗及大寫校驗  
    if ((Code.length != 18) || (patrn.test(Code) == false)) {
        return false;
    } else {
        var Ancode; //統一社會信用代碼的每一個值  
        var Ancodevalue; //統一社會信用代碼每一個值的權重   
        var total = 0;
        var weightedfactors = [1, 3, 9, 27, 19, 26, 16, 17, 20, 29, 25, 13, 8, 24, 10, 30, 28]; //加權因子   
        var str = '0123456789ABCDEFGHJKLMNPQRTUWXY';
        //不用I、O、S、V、Z   
        for (var i = 0; i < Code.length - 1; i++) {
            Ancode = Code.substring(i, i + 1);
            Ancodevalue = str.indexOf(Ancode);
            total = total + Ancodevalue * weightedfactors[i];
            //權重與加權因子相乘之和   
        }
        var logiccheckcode = 31 - total % 31;
        if (logiccheckcode == 31) {
            logiccheckcode = 0;
        }
        var Str = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,T,U,W,X,Y";
        var Array_Str = Str.split(',');
        logiccheckcode = Array_Str[logiccheckcode];
        var checkcode = Code.substring(17, 18);
        if (logiccheckcode != checkcode) {
            return false;
        }
        return true;
    }
}