【小算法】实现一个将中文数字转换成阿拉伯数字的函数

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前言

本文记录一个小的算法,就是中文数字转换成数字算法

实现思路一:

1、从中文数字中逐个识别数字和权位组合

2、根据权位和数字倍数对应关系,计算出每个数字和权位组合值

3、最后求和得出结果

function ChineseToNumber(chnString) {
    const CHN_CHAR_LENGTH = 1;

    const chnNumChar = ["零", "一", "二", "三", "四", "五", "六", "七", "八", "九"];
    const chnUnitChar = ["", "十", "百", "千"]
    const chnUnitSection = ["", "万", "亿", "万亿"]
    const chnValuePair = [
      ["十", 10, false], //  [0] name中文权位名 [1] 10的倍数值 value  [2]secUnit 是否是节权位
      ["百", 100, false],
      ["千", 1000, false],
      ["万", 10000, true],
      ["亿", 100000000, true],
    ]
          //  主要算法
      let rtn = 0;
      let section = 0;
      let number = 0;
      let secUnit = false;
      let pos = 0;
    // 中文数字转换数字,如果返回-1,表示这是一个权位字符。
    function ChineseToValue(chnStr) {
      for (let val = 0; val < chnNumChar.length; val++) {
        if (chnStr == chnNumChar[val]) {
          return val;
        }
      }
      return -1;
    }
    //  chnValuePair 表得到权位对应的10的倍数。
    function ChineseToUnit(chnStr) {
      // console.log(chnStr)
      for (let unit = 0; unit < chnValuePair.length; unit++) {
        if (chnStr == chnValuePair[unit][0]) {
          secUnit = chnValuePair[unit][2];
          // console.log(secUnit)
          return chnValuePair[unit][1];
        }
    }

    return 1;
  }

    while (pos < chnString.length) {
    let num = ChineseToValue(chnString.substr(pos, CHN_CHAR_LENGTH));
    // console.log("num:",num)
    if (num >= 0) // 数字还是单位
    {
        number = num;
        pos += CHN_CHAR_LENGTH;
        if (pos >= chnString.length) //如果是最后一位数字 直接结束
        {
        section += number;
        rtn += section;
        break;
        }
    } else {
        let unit = ChineseToUnit(chnString.substr(pos, CHN_CHAR_LENGTH));
        // console.log("unit",unit,secUnit)
        if (secUnit) //是节权位说明一个节已经结束
        {
        section = (section + number) * unit;
        rtn += section;
        section = 0;
        } else {
        section += (number * unit);
        }
        number = 0;
        pos += CHN_CHAR_LENGTH;
        if (pos >= chnString.length) {
        rtn += section;
        break;
        }
    }
    }

    return rtn;
}

const testPair = [
   [ 0,"零" ],
    [ 1,"一" ],
    [ 2,"二" ],
    [ 3,"三" ],
    [ 4,"四" ],
    [ 5,"五" ],
    [ 6,"六" ],
    [ 7,"七" ],
    [ 8,"八" ],
    [ 9,"九" ],
    [ 10,"一十" ],
    [ 11,"一十一" ],
    [ 110,"一百一十" ],
    [ 111,"一百一十一" ],
    [ 100,"一百" ],
    [ 102,"一百零二" ],
    [ 1020,"一千零二十" ],
    [ 1001,"一千零一" ],
    [ 1015,"一千零一十五" ],
    [ 1000,"一千" ],
    [ 10000,"一万" ],
    [ 20010,"二万零一十" ],
    [ 20001,"二万零一" ],
    [ 100000,"一十万" ],
    [ 1000000,"一百万" ],
    [ 10000000,"一千万" ],
    [ 100000000,"一亿" ],
    [ 1000000000,"一十亿" ],
    [ 1000001000,"一十亿零一千" ],
    [ 1000000100,"一十亿零一百" ],
    [ 200010,"二十万零一十" ],
    [ 2000105,"二百万零一百零五" ],
    [ 20001007,"二千万一千零七" ],
    [ 2000100190,"二十亿零一十万零一百九十" ],
    [ 1040010000,"一十亿四千零一万" ],
    [ 200012301,"二亿零一万二千三百零一" ],
    [ 2005010010,"二十亿零五百零一万零一十" ],
    [ 4009060200,"四十亿零九百零六万零二百" ],
    [ 4294967295,"四十二亿九千四百九十六万七千二百九十五" ]

]

//  测试用例
function  testChineseToNumber()
{
    for(let i = 0; i < testPair.length; i++)
    {
        let  num = ChineseToNumber(testPair[i][1]);
        console.log(num == testPair[i][0]);
    }
}

testChineseToNumber();
// 控制台打印结果 :39 true

实现思路二

1、将中文数字转换成阿拉伯数字

2、将中文权位转换成10的倍数

function transform(str) {
    const numChar = {
        '零':0,
        '一':1,
        '二':2,
        '三':3,
        '四':4,
        '五':5,
        '六':6,
        '七':7,
        '八':8,
        '九':9
    };
    const levelChar = {
        '十':10,
        '百':100,
        '千':1000,
        '万':10000,
        '亿':100000000,
    };
    let ary = Array.from(str)
    let temp = 0
    let sum = 0
    for(let i = 0; i < ary.length; i++) {
        let char = ary[i]
        if(char === '零') continue
        if (char === '亿' || char === '万') {
            sum += temp * levelChar[char]
            temp = 0
        } else {
            let next = ary[i + 1]
            if(next && next !== '亿' && next !== '万') {
                temp += numChar[char] * levelChar[next]
                i++
            } else {
                temp += numChar[char]
            }
        }
    }
    return sum + temp
}

console.log(transform('一十二亿三千零九十六万三千八百九十七'))

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