JavsScript 國際條碼 EAN-13/UPC-A 格式檢核

EAN-13_UPC-A_checking.js

function checkBarcode(code){
    var result = false;
    if(code.length >= 12 && code.length <= 13){
        if(code.length == 12){
            code = "0" + code;
        }
        var odd = 0,
            even = 0;
        for(var i in code){
            if(i%2 == 0){
                odd += code[i]*1;
            }else{
                even += code[i]*1;
            }
        }
        odd = odd - code[code.length-1];
        if((10-(even*3+odd)%10)%10 == code%10){
            result = true;
        }
    }
    return result;
}