// 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;}

// 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;}