常用方法

Posted 2020-10-07 我有小蛮腰

/** 
 * 通用方法的声明
 */
// 通用方法

//获取小数点后num位,x 传入的小数, num 获取小数点后几位
var changeTwoDecimal_f = exports.changeTwoDecimal_f = function(x, num){
    var f_x = parseFloat(x);
    if (isNaN(f_x)) {
        alert(‘function:changeTwoDecimal->parameter error‘);
        return false;
    }
    var f_x = Math.round(x * 100) / 100;
    var s_x = f_x.toString();
    var pos_decimal = s_x.indexOf(‘.‘);
    if (pos_decimal < 0) {
        pos_decimal = s_x.length;
        s_x += ‘.‘;
    }
    while (s_x.length <= pos_decimal + (num-1)) {
        s_x += ‘0‘;
    }
    return parseFloat(s_x);
};

var typeOf = exports.typeOf = function(item) {
    if (Array.isArray(item))
        return ‘array‘;
    return typeof(item);
};
    
// 复制对象(对array和object递归)
// 无法复制构造函数等内容
var cloneOf = exports.cloneOf = function (item) {
    var clone;
    var i;
    switch (typeOf(item)) {
    case ‘array‘:
        i = item.length;
        clone = new Array(i);
        var i = item.length;
            while (i--)
                clone[i] = cloneOf(item[i]);
            break
        case ‘object‘:
            clone = {};
            for (var key in item)
                clone[key] = cloneOf(item[key]);
            break;
        default:
            clone = item;
            break;
        }

    return clone;
};

// 加权随机
// list为随机项列表，单项的结构为{value:1, weight:200}
var random_weight = exports.random_weight = function(list) {
    // 计算总权重
    var total = 0;
    for (var i = 0; i < list.length; i++) {
        if (list[i])
            total += list[i].weight;
    }
    
    // 获取随机数
    var rand = Math.random() * total;
    // 匹配随机项
    var curr_weight = 0;
    for (var i = 0; i < list.length; i++) {
        if (list[i]) { 
            curr_weight += list[i].weight;
            if (curr_weight > rand)
                return list[i];
        }
    }

    return null;
};

/**
 * 从权重字典中随机
 */
var randomWeightDict = exports.randomWeightDict = function (dict) {
    var weight = 0;
    for (var key in dict) {
        weight += dict[key];
    }
    var rand = Math.random() * weight;
    for (var key in dict) {
        weight -= dict[key];
        if (weight <= rand) {
            return key;
        }
    }
    return null;
};

// 加权随机排序, 权重大的越容易排在前面
// list为随机项列表，单项的结构为{value:1, weight:200}
// 返回顺序号(0表示第一个list[0]);
var random_weight_sort = exports.random_weight_sort = function (list) {
    // 计算总权重
    var total = 0;
    var pos = [];
    for (var i = 0; i < list.length; i++) {
        if (list[i]) {
            total += list[i].weight;
            pos.push({idx: i, weight: list[i].weight});
        }
    }
    
    for (var p = 0; p < pos.length-1; p++) {
        // 获取随机数
        var rand = Math.random() * total;
        // 匹配随机项
        var curr_weight = 0;
        var cur_pos = p;
        while (cur_pos < pos.length) {
            curr_weight += pos[cur_pos].weight;
            if (curr_weight >= rand) {
                break;
            }
            cur_pos++;
        }

        var t = pos[cur_pos];
        pos[cur_pos] = pos[p];
        pos[p] = t;
        total -= t.weight;
    }
    
    var idx = [];
    for (var j = 0; j < pos.length; ++j) {
        idx.push(pos[j].idx);
    }
    
    return idx;
};



    
    // 不重复的加权随机
    // arr : [{weight: N, ...}]
    var random_weight_arr = exports.random_weight_arr = function (arr, count) {
        // 计算总权重
        if (arr.length < count) {
            return null;
        }
        if (count == 0) {
            return [];
        }
        if (count == arr.length) return arr;
        
        // 构造备选数组
        var tmp_arr = [];
        for (var i = 0; i < arr.length; ++i) {
            tmp_arr.push({weight: arr[i].weight, idx: i, val: arr[i]});
        }
        
        // 随机选
        var result = [];
        for (var i = 0; i < count; i++) {
            var r = random_weight(tmp_arr);
            if (!r) {
                // 出错
                return null;
            }
            result.push(r.val);
            r.weight = 0; // 退出备选
        }

        return result;
    };

// 整数随机
var random_int = exports.random_int = function(from, to) {
    return Math.floor(from + Math.random() * (to - from + 1));
};

// 间隔随机
var random_gap = exports.random_gap = function(from, to, interval) {
    var length = Math.floor((to - from) / interval);
    var result = random_int(0, length);
    return from + interval * result;
};

// 小数随机
var random = exports.random = function(from, to) {
    return from + Math.random() * (to - from);
};

// 四舍五入保留n位小数
var decimal = exports.decimal = function(num, n) {
    var w = Math.pow(10, n);
    return Math.round(num*w)/w;
};

//从数组arr中随机取count个不重复的元素
var random_arr = exports.random_arr = function(arr, count) {
    if (typeOf(arr) != ‘array‘) return [];
    if (count >= arr.length) return arr;
    var mark = {};
    var result = [];
    var len = arr.length - 1;
    for (var i = 0; i < count; i ++) {
        var index = random_int(0, len);
        if (mark[index] == undefined) {
            result.push(arr[index]);  
        }
        else {
            result.push(arr[mark[index]]);
        }
        //模拟放到末尾,随机到的位置标记成最后那个
        if (mark[len] == undefined) mark[index] = len;
        else mark[index] = mark[len];
        
        len --;
    }
    return result;
};

// 随机选择
// 返回n个数, 取值是0~N-1
var random_select = exports.random_select = function (N, n) {
    if (N <= 0 || n <= 0) return [];
    var r = []; // 记录结果
    var t = {}; // 记录替换
    for (var i = 0; i < n; ++i) {
        var pos = N - 1 - i;
        var posV = pos;
        if (t[pos] !== undefined) posV = t[pos];

        var p = random_int(0, pos);
        var pV = p;
        if (t[p] !== undefined) pV = t[p];
        
        r.push(p);
        t[p] = posV;
    }
    
    // 排序
    r.sort(function (a, b) { return a - b; });

    return r;
};


// 随机洗牌
// N: 需要洗牌的数量
// 返回长度为N的数组, 里面是0~N-1这N个数,已经随机排列
var random_shuffle = exports.random_shuffle = function (N) {
    if (N <= 0) return [];
    var r = [0];
    for (var i = 1; i < N; ++i) {
        r.push(i);
        var pos = random_int(0, i);
        if (pos != i) {
            var t = r[pos];
            r[pos] = r[i];
            r[i] = t;
        }
    }
    
    return r;
};

// 从array或者obj中随机选择一个
// 返回序号或者key
// 失败返回null
var random_selectOne = exports.random_selectOne = function (obj) {
    if (obj instanceof Array) {
        if (obj.length < 1)
            return null;
        return random_int(0, obj.length - 1);
    } else if (typeof (obj) == ‘object‘) {
        var arr = [];
        for (var k in obj) arr.push(k);
        if (arr.length < 1)
            return null;
        return arr[random_int(0, arr.length - 1)];
    }
        
    return null;
};


// 检查数组中是否包含某个元素
// 返回true或false
var isInArray = exports.isInArray = function (arrs, value) {
    if (typeOf(arrs) != ‘array‘) return false;
    for (var i=0; i<arrs.length; i++) {
        var arr = arrs[i];
        if (arr == value) {
            return true;
        } 
    }
    return false;
};



var __UUID_CHARS = ‘0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz‘.split(‘‘); 
exports.uuid = function (len, radix){
    var chars = __UUID_CHARS, uuid = [], rnd = Math.random;
    radix = radix || chars.length;
    if (len){
        for (var i = 0; i < len; i++) uuid[i] = chars[0 | rnd()*radix];
    } else {
        var r;
        uuid[8] = uuid[13] = uuid[18] = uuid[23] = ‘-‘;
        uuid[14] = ‘4‘;
        for (var i = 0; i < 36; i++){
            if (!uuid[i]) {
                r = 0 | rnd()*16;
                uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r & 0xf];
            }
        }
    }
    return uuid.join(‘‘);
};

exports.inTheSameDay = function(t1, t2) {
    if (!t1 || !t2) return false;
    return new Date(t1*1000).toDateString() == new Date(t2*1000).toDateString();
};

exports.inTheSameWeek = function(t1, t2) {
    if (!t1 || !t2) return false;
    t1 = t1 * 1000;
    t2 = t2 * 1000;
    var date1 = new Date(t1);
    var dayOfWeek1 = (date1.getDay()==0 ? 7 : date1.getDay());
    var date3 = new Date(date1.getFullYear(), date1.getMonth(), date1.getDate());
    var t3 = date3.getTime() - (dayOfWeek1-1) * 86400000;
    var t4 = t3 + 7 * 86400000;
    if (t3 <= t2 && t2 < t4)
        return true;
    else
        return false;
},

// 每周开始
// 周一凌晨 0:00
exports.getWeekStart = function(t1) {
    if (t1 === undefined || t1 === null) {
        t1 = getNow();
    }
    t1 = t1 * 1000;
    var date1 = new Date(t1);
    var dayOfWeek1 = (date1.getDay()==0 ? 7 : date1.getDay()); // 周几 1~7
    var date3 = new Date(date1.getFullYear(), date1.getMonth(), date1.getDate());
    var startTime = date3.getTime() - (dayOfWeek1-1) * 86400000;
    return Math.floor(startTime / 1000);
},


exports.inTheSameMonth = function(t1, t2) {
    if (!t1 || !t2) return false;
    var date1 = new Date(t1 * 1000);
    var date2 = new Date(t2 * 1000);
    if (date1.getFullYear() == date2.getFullYear() &&
        date1.getMonth() == date2.getMonth())
        return true;
    else 
        return false;
};

exports.lastSecondOfDay = function(time) {
    var date = new Date(time * 1000);
    date.setHours(23);
    date.setMinutes(59);
    date.setSeconds(59);
    return Math.floor(date.getTime() / 1000);
};

exports.getSomeDayTime = function(time, hmsFormat) {
    var date = new Date(time * 1000);
    var format = formatDate(date);
    return getTime(format.split(‘ ‘)[0] + ‘ ‘ + hmsFormat);
};

exports.getTodayTime = function(hmsFormat) {
    var date = new Date();
    var format = formatDate(date);
    return getTime(format.split(‘ ‘)[0] + ‘ ‘ + hmsFormat);
};

var getTime = exports.getTime = function(format) {
    var tmp = format.split(‘ ‘);
    var day = tmp[0];
    var time = tmp[1] || ‘00:00:00‘;
    var day = day.split(‘-‘);
    if(!day[2])
        day[2] = ‘01‘;
    var time = time.split(‘:‘);
    var date = new Date(day[0],day[1]-1,day[2],time[0]||0,time[1]||0,time[2]||0,0);
    return Math.floor(date.getTime()/1000);
};

// 字符串转为秒
// "dd hh:mm:ss" 或者 "hh:mm:ss" 或者 "hh:mm"
var stringToSecond = exports.stringToSecond = function (d_hms) {
    var day = 0;
    var sec = 0;
    var tmp = d_hms.split(‘ ‘);
    if (tmp.length > 1) {
        day = +tmp[0];
        tmp = tmp[1].split(‘:‘);
    } else {
        tmp = tmp[0].split(‘:‘);
    }
    
    sec = (+tmp[0]) * 3600 + (+tmp[1]) * 60;
    if (tmp.length >= 3) {
        sec += (+tmp[2]);
    }

    sec += (day * 24 * 3600);

    return sec;
};

// time的时间单位为秒
exports.isInTheDateRange = function(time, start, end) {
    var start_time = getTime(start);
    var end_time = getTime(end);
    if (time > start_time && time < end_time)
        return true;
    return false;
};

exports.isInTheDateRangeEx = function(time, start, end) {
    var start_time = getTime(start);
    var end_time = getTime(end);
    if (time >= start_time && time <= end_time)
        return true;
    return false;
};

var getNow = exports.getNow = function() {
    return Math.floor(Date.now()/1000);
};

exports.getToday = function() {
    var date = new Date();
    date.setHours(0);
    date.setMinutes(0);
    date.setSeconds(0);
    return Math.floor(date/1000);
};

//获取第day天后0点时间戳 time为时间戳
exports.getTimestamp = function(time, day) {
    var date = new Date(time * 1000);
    date.setHours(0);
    date.setMinutes(0);
    date.setSeconds(0);
    var timestamp = 0;
    if(!isNaN(parseInt(day))){
        timestamp = day * 24 * 3600;
    }
    return Math.floor(date.getTime() / 1000) + Math.floor(timestamp);
};

exports.getUnixTime = function(date) {
    var arr = date.split(‘-‘).map(function(a){return +a;})
    var newDate = new Date(arr[0], arr[1] - 1, arr[2], 0, 0, 0, 0);
    return newDate.getTime();
};

//获取某年月1号
exports.getYearMonthFirstDay = function(date) {
    if(!date)
        date = new Date();
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    if (month < 10) month = ‘0‘ + month;
    return ‘‘ + year + ‘-‘  + month + ‘-‘+ ‘01‘;
};

var formatDate = exports.formatDate = function(date) {
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    if (month < 10) month = ‘0‘ + month;
    var day = date.getDate();
    if (day < 10) day = ‘0‘ + day;
    var hour = date.getHours();
    if (hour < 10) hour = ‘0‘ + hour;
    var minute = date.getMinutes();
    if (minute < 10) minute = ‘0‘ + minute;
    var second = date.getSeconds();
    if (second < 10) second = ‘0‘ + second;
    return ‘‘ + year + ‘-‘  + month + ‘-‘+ day + ‘ ‘ + hour + ‘:‘ + minute + ‘:‘ + second;
};

//返回yyyy-mm-dd
var formatDate2 = exports.formatDate2 = function(date) {
    var year = date.getFullYear();
    var month = date.getMonth() + 1;
    if (month < 10) month = ‘0‘ + month;
    var day = date.getDate();
    if (day < 10) day = ‘0‘ + day;
    return ‘‘ + year + ‘-‘  + month + ‘-‘+ day;
};
//判断输入字符串是否是有效日期格式 (1) yyyy-mm-dd (2) yyyy-mm-dd hh:mm:ss  (3) yyyy-mm-dd hh:mm
exports.isDate = function(strDate) {
   try{
        var tmp = strDate.split(‘ ‘);
        if(!tmp[1])tmp[1]=‘1:1‘;
        var days = tmp[0].split(‘-‘);
        var times = tmp[1].split(‘:‘);
        if(days.length!=3)return false;
        if(!(times.length==2 || times.length==3))return false;
        for(var i=0;i<days.length;i++){
            if(isNaN(parseInt(days[i])))return false;
        }
        for(var i=0;i<times.length;i++){
            if(isNaN(parseInt(times[i])))return false;
        }
        var year = parseInt(days[0], 10);
        if(year<1 || year>9999)return false;
        var month = parseInt(days[1], 10);
        if(month<1 || month>12)return false;
        
        var day = parseInt(days[2], 10);
        var maxDay =31;
        if(month==4 || month==6 || month==9 ||month ==11)maxDay =30;
        if(month==2){
            if(year%4 != 0) maxDay = 28;
            else if(year%100==0 && year%400!=0) maxDay = 28;
            else  maxDay = 29;
        }
        if(day<1 || day>maxDay)return false;
        
        var hour = parseInt(times[0], 10);
        if(hour<0 || hour>23)return false;
        var minute = parseInt(times[1], 10);
        if(minute<0 || minute>59)return false;
        if(times.length == 3){
            var sec = parseInt(times[2], 10);
            if(sec<0 || sec>59)return false;
        }
        return true;
    }catch(e){
        return false;
    }
};

exports.dateDiff = function(time1, time2) {
    var date1 = new Date(time1 * 1000);
    var date2;
    if (time2 == undefined) {
        date2 = new Date();
    }
    else date2 = new Date(time2 * 1000);
    date1.setHours(0);
    date1.setMinutes(0);
    date1.setSeconds(0);
    date2.setHours(0);
    date2.setMinutes(0);
    date2.setSeconds(0);
    return Math.round((date2 - date1)/86400000) + 1;
};

// same as dateDiff but minus 1
exports.dateDiff2 = function(time1, time2) {
    var date1 = new Date(time1 * 1000);
    var date2;
    if (time2 == undefined) {
        date2 = new Date();
    } else 
        date2 = new Date(time2 * 1000);
    date1.setHours(0);
    date1.setMinutes(0);
    date1.setSeconds(0);
    date2.setHours(0);
    date2.setMinutes(0);
    date2.setSeconds(0);
    return Math.round((date2 - date1)/86400000);
};

//取得将来的周几的几点，对应的秒级时间 time格式11:30 or 11:30:00, weekDay 0-6
exports.getFutureTimeByWeek = function(weekDay, time, from) {
    var date;
    if (!from) date = new Date();
    else date = new Date(from * 1000);
    var nowWeekDay = date.getDay();
    var nowHour = date.getHours();
    var nowMinute = date.getMinutes();
    var nowSecond = date.getSeconds();
    var tmp = time.split(‘:‘);
    var futureHour = tmp[0] || 0;
    var futureMinute = tmp[1] || 0;
    var futureSecond = tmp[2] || 0;
    date.setHours(futureHour);
    date.setMinutes(futureMinute);
    date.setSeconds(futureSecond);
    var todayFutureTime = Math.floor(date.getTime()/1000);
    if (nowWeekDay == weekDay) {
        var interval = nowHour * 3600 + nowMinute * 60 + nowSecond - futureHour * 3600 - futureMinute * 60 - futureSecond;
        //时间未到，就是当天了
        if (interval <= 0) {
            return todayFutureTime;
        }
        //已经过了时间
        else {
            return todayFutureTime + 86400 * 7;
        }
    }
    else {
        if (nowWeekDay < weekDay) return todayFutureTime + 86400 * (weekDay - nowWeekDay);
        else return todayFutureTime + 86400 * (weekDay + 7 - nowWeekDay);
    }
};

// 取符号
var sign = exports.sign = function(a) {
    if (a > 0)
        return 1;
    else if (a < 0)
        return -1;
    else 
        return 0;
};

//服务器大区前缀
exports.getSvrPrex = function(gId) {
    var svrId = gId.split(‘-‘)[1];
    if (!svrId) return ‘‘;
    return i18n(‘svrPrex‘, svrId);
};

exports.getMaxKey = function(dict) {
    var max = 0;
    for (var k in dict) {
        k = parseInt(k);
        if (k > max) {
            max = k;
        }
    }
    return max;
};

// 根据key从字典数据中取值，未达到key值的则取前一个key对应的值
exports.getValueFromDictByRange = function(dict, key) {
    var value = undefined;
    var final_key = 0;
    for (var k in dict) {
        k = parseInt(k);
        if (key >= k && final_key < k)
            final_key = k;
    }
    if (dict[final_key] != undefined)
        value = dict[final_key]; 
    return value;
};

// 根据key从字典数据中取值，取一个key对应的值
exports.getValueFromDict= function(dict, key) {
    var value = undefined;
    var final_key = 0;
    for (var k in dict) {
        k = parseInt(k);
        if (key == k)
            final_key = k;
    }
    if (dict[final_key] != undefined)
        value = dict[final_key]; 
    return value;
};



// 根据key从字典数据中取值，取大于等于key对应的值
exports.getValueFromDictByMax = function(dict, key) {
    var value = undefined;
    var max_key = 0;
    for (var k in dict) {
        var int_k = parseInt(k);
        if (max_key < int_k)
            max_key = int_k;
    }
    var final_key = max_key + 1;
    for (var k in dict) {
        var int_k = parseInt(k);
        if (key <= int_k && final_key >= int_k)
            final_key = int_k;
    }

    if (dict[final_key])
        value = dict[final_key];
    return value;
};

// 根据key从字典数据中取值，取大于key对应的值
exports.getValueFromDictByMaxNotEqual = function(dict, key) {
    var value = undefined;
    var max_key = 0;
    for (var k in dict) {
        var int_k = parseInt(k);
        if (max_key < int_k)
            max_key = int_k;
    }
    var final_key = max_key + 1;

    for (var k in dict) {
        var int_k = parseInt(k);
        if (key < int_k && final_key >= int_k)
            final_key = int_k;
    }

    if (dict[final_key] != undefined)
        value = dict[final_key];
    return value;
};

//校验IP地址格式
exports.isIP = function(strIP) {
    if (!strIP || ‘‘ == strIP) {
        return false;
    }
    var re = /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/g;    //匹配正则表达式
    if (re.test(strIP)) {
        if (RegExp.$1 < 256 && RegExp.$2 < 256 && RegExp.$3 < 256 && RegExp.$3 < 256) {
            return true;
        }
    }
    return false;
};

exports.isInList = function(list, item) {
    if (!list || !item || ‘‘ == item || list.length == 0) return false;
    for (var i = 0; i < list.length; i++) {
        if (item == list[i]) 
            return true;
    }
    return false;
};
    
// 判断对象是否是[]或者{}
// 各种非Object都返回true
    exports.isEmpty = function (obj) {
        for (var name in obj) {
            return false;
        }
        return true;
    };

    // 获取指定的属性
    exports.getAttr = function (attrs, getlist, clone) {
        var attr = {};
        for (var i in getlist) {
            var k = getlist[i];
            var v = attrs[k];
            if (v === undefined) {
                continue;
            }
            
            if (clone) {
                attr[k] = cloneOf(v);
            } else {
                attr[k] = v;
            }
        }

        return attr;
    };

    // 将字符串转换成数组
    // "123|456|789" ==> [123,456,789]
    exports.getNumberArray = function (str, splitChar) {
        if (typeof (str) == ‘number‘)
            return [str];

        if (!str)
            return [];
        
        var ret = [];
        splitChar = splitChar || "|"; // 默认分隔符
        var strArray = ("" + str).split(splitChar);
        for (var i = 0; i < strArray.length; ++i) {
            ret.push(Number(strArray[i]));
        }

        return ret;
    };

// 删除数组中指定的值
// 成功删除返回true
exports.removeArrayValue = function (arr, value) {
    if (!(arr instanceof Array)) {
        return false;
    }
    if (value == undefined) {
        return false;
    }
    
    var idx = arr.indexOf(value);
    if (idx < 0) {
        return false;
    }
    
    arr.splice(idx, 1);

    return true;
};


exports.isMoneyName = function (name) {
    if (!name || typeof (name) !== ‘string‘) {
        return false;
    }
    
    // 金钱种类定义见 FinanceType
    for (var k in FinanceType) {
        if (FinanceType[k] == name) {
            return true;
        }
    }

    return false;
};


// 根据数组中指定的元素进行排序
// 参数 desc/asc 分别代表 倒序 正序  与 执行元素
// 返回符合条件的数组
exports.getSortFun = function (order, sortBy) {
    var ordAlpah = (order == ‘asc‘) ? ‘>‘ : ‘<‘;
    var sortFun = new Function(‘a‘, ‘b‘, ‘return a.‘ + sortBy + ordAlpah + ‘b.‘ + sortBy + ‘?1:-1‘);
    return sortFun;
};

exports.isSuccess = function (rate) {
    return Math.random() < rate;
};


//传入两个坐标，返回两个坐标之间的距离
var getDistance = exports.getDistance = function (coordinate1, coordinate2) {
    var d = 0;
    if (coordinate1 && coordinate2) {
        var x1 = coordinate1.x;
        var y1 = coordinate1.y;
        var x2 = coordinate2.x;
        var y2 = coordinate2.y;
        d = Math.sqrt(Math.pow(x1-x2, 2) + Math.pow(y1-y2, 2));
    }
    return d;
};

/*
coord1 当前坐标
coord2 目标坐标
h 矩形高
w 矩形宽
根据当前坐标计算中心点坐标
*/
exports.isInRectangle = function (coord1, coord2, h, w) {
    var leftDown = {x: coord1.x - w/2, y: coord1.y};
    var rightDown = {x: coord1.x + w/2, y: coord1.y};
    var leftUp = {x: coord1.x - w/2, y: coord1.y + h};
    var rightUp = {x: coord1.x + w/2, y: coord1.y + h};
    if (coord2.x >= leftDown.x && coord2.x <= rightUp.x && coord2.y >= leftDown.y && coord2.y <= rightUp.y) {
        return true;
    }
    return false;
};

/*
coord1 当前坐标
coord2 目标坐标
h 攻击范围
判断点在圆形范围内
*/
exports.isCanAttack = function (coord1, coord2, h) {
    var isIn = getDistance(coord1, coord2);
    // 两点坐标小于攻击范围
    if (h > isIn) {
        return true;
    }
    return false;
};

var find_model_sql = exports.find_model_sql = function (sql, params) {
    var deferred = new promise.Deferred();
    persist.queryModelWithEscape(sql, params, function (err, cursor) {
        if (err) {
            deferred.emitSuccess(null);
        } else {
            var results = [];
            cursor.forEach(function (doc) {
                if (doc != null) {
                    results.push(doc);
                }
            });
            if (results.length === 0) {
                deferred.emitSuccess(null);
            } else {
                deferred.emitSuccess(results);
            }
        }
    });
    return deferred.promise;
};

exports.check_seq = function (seq) {
    //从数据库载入seq记录
    var sql = "SELECT name, val FROM nx_sequence";
    return find_model_sql(sql, []).then(function (result) {
        var res_obj = {};
        if (result) {
            var error_seq = [];
            for (var i = 0; i < result.length; i++) {
                res_obj[result[i].name] = true;
            }
            for (var name in seq) {
                if (!res_obj[name]) {
                    error_seq.push(name);
                }
            }
            if (error_seq.length > 0) {
                for (var i = 0; i < error_seq.length; i++) {
                    sys.log("ERROR: sequence " + error_seq[i] + " not found in mysql");
                }
                sys.log("ERROR: sequence not found in mysql, process exit!");
                return false;
            }
            return true;
        } else {
            sys.log(‘ERROR: find nx_sequence record failed! process exit!‘);
            return false;
        }
    });
};