常用的一些函

//判断数据类型的方法
let arr= [1,2,3]
function getDataType(args) {
            let cc= Object.prototype.toString.call(args) 
            // [object ...]
            
            return  '数据类型是：'+ cc.replace(/^[object (S+)]$/, '$1');
        }
        console.log(getDataType(arr))

//金额大小写转换
function convertCurrency (currencyDigits) {
                var MAXIMUM_NUMBER = 1000000000000.0;

                var CN_ZERO = '零';
                var CN_ONE = '壹';
                var CN_TWO = '贰';
                var CN_THREE = '叁';
                var CN_FOUR = '肆';
                var CN_FIVE = '伍';
                var CN_SIX = '陆';
                var CN_SEVEN = '柒';
                var CN_EIGHT = '捌';
                var CN_NINE = '玖';
                var CN_TEN = '拾';
                var CN_HUNDRED = '佰';
                var CN_THOUSAND = '仟';
                var CN_TEN_THOUSAND = '万';
                var CN_HUNDRED_MILLION = '亿';
                var CN_SYMBOL = '人民币';
                var CN_DOLLAR = '元';
                var CN_TEN_CENT = '角';
                var CN_CENT = '分';
                var CN_INTEGER = '整';

                var integral; // integral part
                var decimal; // decimal part
                var outputCharacters = ''; // result.
                var parts;
                var digits, radices, bigRadices, decimals;
                var zeroCount;
                var i, p, d;
                var quotient, modulus;

                if (currencyDigits != null) {
                    currencyDigits = currencyDigits.toString();
                    currencyDigits = currencyDigits.replace(/,/g, ''); // Remove comma delimiters.
                    currencyDigits = currencyDigits.replace(/^0+/, ''); // Trim zeros at the beginning.

                    if (Number(currencyDigits) < MAXIMUM_NUMBER) {
                        if (Number(currencyDigits) < 0) {
                            outputCharacters += '负';
                            currencyDigits = Math.abs(Number(currencyDigits)).toString();
                        }

                        parts = currencyDigits.split('.'); // separate the number by decimal point
                        if (parts.length > 1) {
                            integral = parts[0];
                            decimal = parts[1];
                            decimal = decimal.substr(0, 2); // two decimal places
                        } else {
                            integral = parts[0];
                            decimal = '';
                        }

                        digits = new Array(
                            CN_ZERO,
                            CN_ONE,
                            CN_TWO,
                            CN_THREE,
                            CN_FOUR,
                            CN_FIVE,
                            CN_SIX,
                            CN_SEVEN,
                            CN_EIGHT,
                            CN_NINE
                        );
                        radices = new Array('', CN_TEN, CN_HUNDRED, CN_THOUSAND);
                        bigRadices = new Array('', CN_TEN_THOUSAND, CN_HUNDRED_MILLION);
                        decimals = new Array(CN_TEN_CENT, CN_CENT);

                        if (Number(integral) > 0) {
                            zeroCount = 0;
                            for (i = 0; i < integral.length; i++) {
                                p = integral.length - i - 1;
                                d = integral.substr(i, 1);
                                quotient = p / 4;
                                modulus = p % 4;
                                if (d == '0') {
                                    zeroCount++;
                                } else {
                                    if (zeroCount > 0) {
                                        outputCharacters += digits[0];
                                    }
                                    zeroCount = 0;
                                    outputCharacters += digits[Number(d)] + radices[modulus];
                                }
                                if (modulus == 0 && zeroCount < 4) {
                                    outputCharacters += bigRadices[quotient];
                                }
                            }
                            outputCharacters += CN_DOLLAR;
                        }

                        if (decimal != '') {
                            for (i = 0; i < decimal.length; i++) {
                                d = decimal.substr(i, 1);
                                if (d != '0') {
                                    outputCharacters += digits[Number(d)] + decimals[i];
                                }
                            }
                        }
                        if (outputCharacters == '') {
                            outputCharacters = CN_ZERO + CN_DOLLAR;
                        }
                        if (decimal == '') {
                            outputCharacters += CN_INTEGER;
                        }
                        outputCharacters = '' + outputCharacters + '';
                    }
                }
                return outputCharacters;
            };

// 格式化金钱 每三位进用逗号隔开（银行金钱格式）
function outputcents (amount) {
    amount = Math.round(((amount) - Math.floor(amount)) * 100);
    return (amount < 10 ? '.0' + amount : '.' + amount);
};

function outputdollars (number) {
    if (number.length <= 3)
        return (number == '' ? '0' : number);
    else {
        var mod = number.length % 3;
        var output = (mod == 0 ? '' : (number.substring(0, mod)));
        for (var i = 0; i < Math.floor(number.length / 3); i++) {
            if ((mod == 0) && (i == 0))
                output += number.substring(mod + 3 * i, mod + 3 * i + 3);
            else
                output += ',' + number.substring(mod + 3 * i, mod + 3 * i + 3);
        }
        return (output);
    }
};

 function outputmoney (number) {
    // number = number.toString().replace(/\,/g, "");
    number = number.toString().replace(/\,/g, "");
    if (isNaN(number) || number == "") return "";
    number = Math.round(number * 100) / 100;
    if (number < 0)
        return '-' + outputdollars(Math.floor(Math.abs(number) - 0) + '') + outputcents(Math.abs(number) - 0);
    else
        return outputdollars(Math.floor(number - 0) + '') + outputcents(number - 0);
};
console.log(outputmoney(15698763)) // 15,698,763.00

　　　　　　　　// 随机数生成函数区间
            function randomNumber (startNum, endNum) {
                if (startNum.constructor !== Number || endNum.constructor !== Number) {
                    alert('您输入的范围区间数据数据类型不正确！')
                    return false
                }

                return Math.floor(Math.random() * (endNum - startNum) + startNum)
            }