天发表了一篇阿拉伯数字转中文汉字的Java方法的文章。

Java方法在后端比较方便。但是前端转换的话，用JS方法就方便多了。

为了前端转换不用请求服务器。现把同样逻辑的Java方法，用JS来实现。

function convertNumberToChinese(inputData) {
    var decimalUnit = new Map();
    decimalUnit.set(-2, "分");
    decimalUnit.set(-1, "角");
    decimalUnit.set(1, "元");
    decimalUnit.set(2, "拾");
    decimalUnit.set(3, "佰");
    decimalUnit.set(4, "仟");
    decimalUnit.set(5, "万");
    decimalUnit.set(6, "拾");// 十万
    decimalUnit.set(7, "佰");// 佰万
    decimalUnit.set(8, "仟");// 仟万
    decimalUnit.set(9, "亿");
    decimalUnit.set(10, "拾");// 十亿
    decimalUnit.set(11, "佰");// 佰亿
    decimalUnit.set(12, "仟");// 仟亿
    decimalUnit.set(13, "兆");
    decimalUnit.set(14, "拾");// 十兆
    decimalUnit.set(15, "佰");// 佰兆
    decimalUnit.set(16, "仟");// 仟兆

    var extraUnit = new Array();
    extraUnit.push("万");
    extraUnit.push("亿");
    extraUnit.push("兆");

    var unitCount = new Map();
    unitCount.set(0, "零");
    unitCount.set(1, "壹");
    unitCount.set(2, "贰");
    unitCount.set(3, "叁");
    unitCount.set(4, "肆");
    unitCount.set(5, "伍");
    unitCount.set(6, "陆");
    unitCount.set(7, "柒");
    unitCount.set(8, "捌");
    unitCount.set(9, "玖");

    var outputData = "";

    integerData = null;
    scaleData = null;


    var decimalMatcher = inputData.match(new RegExp(/^(\d{1,16})\.(\d{0,2})$/));
    var integerMatcher = inputData.match(new RegExp(/^(\d{1,16})$/));
    if (decimalMatcher != null && decimalMatcher.length == 3) {// 小数的场合
        integerData = decimalMatcher[1];
        scaleData = decimalMatcher[2];
    } else if (integerMatcher != null && integerMatcher.length == 2) {// 整数的场合
        integerData = integerMatcher[1];
    }

    // 转换整数
    if (integerData != null && integerData != "") {
        for (var k = 0; k < integerData.length; k++) {
            var inputChar = integerData[k];
            var currentUnitCount = parseInt(inputChar);
            var currentUnit = decimalUnit.get(integerData.length - k);
            var numToChinese = null;
            if (currentUnitCount == 0) {
                numToChinese = unitCount.get(currentUnitCount);
                if (k == integerData.length - 1) {
                    numToChinese = unitCount.get(currentUnitCount) + currentUnit;
                } else if (extraUnit.includes(currentUnit)) {
                    numToChinese = currentUnit;
                }

            } else {
                numToChinese = unitCount.get(currentUnitCount) + currentUnit;
            }
            outputData = outputData + numToChinese;
        }
    }

    // 转换小数
    if (scaleData != null && scaleData != "") {
        for (var k = 0; k < scaleData.length; k++) {
            var inputChar = scaleData[k];
            var currentUnitCount = parseInt(inputChar);
            var currentUnit = decimalUnit.get(-(k + 1));
            var numToChinese = null;
            if (currentUnitCount == 0) {
                numToChinese = unitCount.get(currentUnitCount);
            } else {
                numToChinese = unitCount.get(currentUnitCount) + currentUnit;
            }
            outputData = outputData + numToChinese;
        }
    }

    // 去除重复的零
    outputData = outputData.replace(/(零{2,})/g, '');
    if (outputData != "零元") {
        // 去除零
        outputData = outputData.replace(/(零{1})/g, '');
        // 去除不合理的单位
        outputData = outputData.replace(/^(零元)/g, '');
        outputData = outputData.replace(/(亿万)/g, '亿');
        outputData = outputData.replace(/(兆亿)/g, '兆');
        outputData = outputData.replace(/^(兆)/g, '');
        outputData = outputData.replace(/^(亿)/g, '');
        outputData = outputData.replace(/^(万)/g, '');
    }
    return outputData;
}

调用方式如下：

convertNumberToChinese('1000.12')

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