doomi-helper/utilities/utilities.js

Doomisoft NodeJs Common Utilities

var uuid            =   require('node-uuid')
class Utilities {
    /*
    * 判断对象是否为空
    */
    static isNullOrEmpty(value) {
        if (typeof (value) == "undefined" || value == null || value === '' || value === "undefined") return true;
        return false;
    }
    /*
    随机生成字符串
    */
    static generateRandomSerial(length = 4, onlyNumber = true) {
        let serial = [];
        if (onlyNumber) {
            for (var i = 0; i < length; i++) serial.push(Math.floor(Math.random() * 10));
            return serial.join('');
        }
        var $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';    /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
        var maxPos = $chars.length;
        for (i = 0; i < length; i++)
            serial.push($chars.charAt(Math.floor(Math.random() * maxPos)));
        return serial.join('');
    }
    /**
     * 生成一些随机的兑换码
     * @param {*} count 
     */
    static generateRandomCode(count){
        var $chars = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'; 
        let returnValue = [];
        for (var jLoop=0;jLoop<count;jLoop++){
            let seed = uuid.v4().split('-').join('');
            let newValue = [];
            for (var iLoop = 0; iLoop < 8; iLoop++) {  
                let str = seed.substring(iLoop * 4, (iLoop+1) * 4);  
                let xValue = parseInt(str, 16);  
                newValue.push($chars[xValue % 0x3E]);  
            }  
            returnValue.push(newValue.join(''))
        }
        return returnValue;
    }


    /*
    * 文字替换
    */
    static replace(originalStr, replFrom, replTo, ingoreCase = true) {
        // let regex = new RegExp(replFrom, "i", "g");
        // return originalStr.replace(regex, replTo);
        if (!RegExp.prototype.isPrototypeOf(replFrom)) {
            return originalStr.replace(new RegExp(replFrom, (ingoreCase ? "gi" : "g")), replTo);
        }
        return originalStr.replace(replFrom, replTo);
    }

    /*
    * 
    */
    static ifNull(value, nullValue) {
        if (value == null || value == "undefined" || value == "null" || (typeof value != "boolean" && value == "")) return nullValue;
        return value;
    }
    //判断是否为方法
    static isFunction(obj) {
        return obj != null && typeof (obj) === "function";
    }
}
exports = module.exports = Utilities;