JavaScript将输入的数值转换为人民币大写

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/yhj198927/article/details/89354089

function convertCurrency(currencyDigits) {

            var MAXIMUM_NUMBER = 99999999999.99;  //最大值
            // 定义转移字符
            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 = "萬";
            var CN_HUNDRED_MILLION = "億";
            var CN_DOLLAR = "圆";
            var CN_TEN_CENT = "角";
            var CN_CENT = "分";
            var CN_INTEGER = "整";

            // 初始化验证:
            var integral, decimal, outputCharacters, parts;
            var digits, radices, bigRadices, decimals;
            var zeroCount;
            var i, p, d;
            var quotient, modulus;

            // 验证输入字符串是否合法
            if (currencyDigits.toString() == "") {
                alert("还没有输入数字");
                $("#txtMoney").focus();
                return;
            }
            
            if (parseFloat(currencyDigits).toString() == "NaN") {
                alert("请输入有效格式数字");
                $("#txtMoney").focus();
                return;
            }
            
            currencyDigits = currencyDigits.replace(/,/g, "");
            currencyDigits = currencyDigits.replace(/^0+/, "");
            //判断输入的数字是否大于定义的数值
            if (Number(currencyDigits) > MAXIMUM_NUMBER) {
                alert("您输入的数字太大了");
                $("#txtMoney").focus();
                return;
            }
            if (Number(currencyDigits) < 5000) {
                document.getElementById("trToDisplay").style.display = "none";
                document.getElementById("test1").style.display = "none";
                document.getElementById("test2").style.display = "none";
                document.getElementById("test3").style.display = "none";
                document.getElementById("test4").style.display = "block";
            }
            else {
                document.getElementById("trToDisplay").style.display = "block";
                document.getElementById("test1").style.display = "block";
                document.getElementById("test2").style.display = "block";
                document.getElementById("test3").style.display = "block";
                document.getElementById("test4").style.display = "none";
            }

            parts = currencyDigits.split(".");
            if (parts.length > 1) {
                integral = parts[0];
                decimal = parts[1];
                decimal = decimal.substr(0, 2);
            }
            else {
                integral = parts[0];
                decimal = "";
            }
            // 实例化字符大写人民币汉字对应的数字
            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);

            outputCharacters = "";
            //大于零处理逻辑
            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;
            }
            // 包含小数部分处理逻辑
            if (decimal != "") {
                for (i = 0; i < decimal.length; i++) {
                    d = decimal.substr(i, 1);
                    if (d != "0") {
                        outputCharacters += digits[Number(d)] + decimals[i];
                    }
                }
            }
            //确认并返回最终的输出字符串
            if (outputCharacters == "") {
                outputCharacters = CN_ZERO + CN_DOLLAR;
            }
            if (decimal == "") {
                outputCharacters += CN_INTEGER;
            }
        }