组织机构代码和社会信用码验证

function checkCode() {//社会统一验证码
    var code = document.getElementById("userName").value;
    if(code.length != 18&&code.length != 9){
        alert("社会信用代码或者组织机构代码长度错误！");
        return false;
    }
    if(code.length == 9){
        var ws = [3, 7, 9, 10, 5, 8, 4, 2];
        var str = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
        var reg = /^([0-9A-Z]){9}$/;
        if (!reg.test(code)) {
            alert("组织机构代码错误");
            return false;
        }
        var sum = 0;
        for (var i = 0; i < 8; i++) {
            sum += str.indexOf(code.charAt(i)) * ws[i];
        }
        alert(code.substring(8,9));
        var C9 = 11 - (sum % 11);
        if (C9 == 11) {
            C9='0';
        } else if (C9 == 10) {
            C9='X';
        }
        alert(C9);
        if(C9!=code.substring(8,9)){
            alert("组织机构代码错误");
            return false;
        }

    }
    if(code.length == 18){
        var reg = /^([0-9ABCDEFGHJKLMNPQRTUWXY]{2})([0-9]{6})([0-9ABCDEFGHJKLMNPQRTUWXY]{9})([0-9Y])$/;
        if(!reg.test(code)){
            alert("社会信用代码校验错误！");
            return false;
        }
        var str = '0123456789ABCDEFGHJKLMNPQRTUWXY';
        var ws =[1,3,9,27,19,26,16,17,20,29,25,13,8,24,10,30,28];
        var codes  = new Array();
        codes[0] = code.substr(0,code.length-1);
        codes[1] = code.substr(code.length-1,code.length);

        var sum = 0;
        for(var i=0;i<17;i++){
            sum += str.indexOf(codes[0].charAt(i)) * ws[i];
        }

        var c18 = 31 - (sum % 31);
        if(c18 == 31){
            alert("第18位 == 31");
            c18 = 'Y';
        }else if(c18 == 30){
            alert("第18位 == 30");
            c18 = '0';
        }

        if(c18 != codes[1]){
            alert("社会信用代码有误！"+c18);
            return false;
        }
    }


}

　　

来源：http://www.cnblogs.com/caozengling/p/6257368.html