//fn: 截取字符串长短
            function fnSubString(oldStr, requireLength, endWith) {
                //1.oldStr是否可用
                if (typeof oldStr == "string") {
                    if ((oldStr.length < 1) || (oldStr.length <= requireLength)) {
                        return oldStr;
                    }
                    if (oldStr.length > requireLength) {
                        //判断endwith是否可用
                        return ((typeof endWith == "string") ? oldStr.substr(0, requireLength) + endWith + "" : oldStr.substr(0, requireLength) + "");
                    }
                } else {
                    //判断endwith是否可用;仅仅显示"..."，表示oldStr不可用
                    return ((typeof endWith == "string") ? endWith + "" : "...");
                }
            }



//fn: 截取字符串长短
function fnSubString(oldStr, requireLength, endWith) {
    //设置参数格式
    oldStr += "";
    endWith += "";
    requireLength = parseInt(requireLength + "", 10);

    if ((oldStr.length < 1) || (oldStr.length <= requireLength)) {
        return oldStr;
    }
    if (oldStr.length > requireLength) {
        //判断endwith是否可用
        return ((typeof endWith == "string") ? oldStr.substr(0, requireLength) + endWith + "" : oldStr.substr(0, requireLength) + "");
    }
}

//fn: 截取字符串长短
function fnSubString(oldStr, requireLength, endWith) {
    //设置参数格式
    oldStr += "";
    endWith += "";
    requireLength = parseInt(requireLength + "", 10);

    if ((oldStr.length < 1) || (oldStr.length <= requireLength)) {
        return oldStr;
    }
    if (oldStr.length > requireLength) {
        return oldStr.substr(0, requireLength) + endWith;
    }
}