--查看oracle数据库字符集：

　　select userenv('language') from dual;

// GBK字符集实际长度计算
function getStrLeng(str){
    var realLength = 0;
    var len = str.length;
    var charCode = -1;
    for(var i = 0; i < len; i++){
        charCode = str.charCodeAt(i);
        if (charCode >= 0 && charCode <= 128) {
            realLength += 1;
        }else{
            // 如果是中文则长度加2
            realLength += 2;
        }
    }
    return realLength;
}

// UTF8字符集实际长度计算
function getStrLeng(str){
    var realLength = 0;
    var len = str.length;
    var charCode = -1;
    for(var i = 0; i < len; i++){
        charCode = str.charCodeAt(i);
        if (charCode >= 0 && charCode <= 128) {
            realLength += 1;
        }else{
            // 如果是中文则长度加3
            realLength += 3;
        }
    }
    return realLength;
}