小写金额转大写

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小写金额转大写

传统方式

代码：

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function changeZN(num){

  let charList=[0, '壹', '贰', '叁', '肆','伍', '陆', '柒', '捌', '玖'];
  let lowUnitList= ['千','百','拾',''];

  // let num='0';
  num=num.padStart(Math.ceil(num.length/8)*8,0);
  let len=Math.ceil(num.length/8);
  let numSlice=[];

  for(let i=0;i<len;i++){
    numSlice.push(num.slice(i*8,(i+1)*8))
  }

  let allList=[];

  for(let k=0;k<len;k++){

    let num=numSlice[k];
    num=num.padStart(Math.ceil(num.length/4)*4,0);
    let unitSlice=[];
    let unitLen=Math.floor(num.length/4);
    let uintInteger=Math.floor(num/(10**4));
    let unitMod=num%(10**4);

    for(let n=0;n<unitLen;n++){
      unitSlice.push(num.slice(n*4,(n+1)*4))
    }

    let charNumList=[]
    for(let i=0;i<unitSlice.length;i++){
      let charNum=''
      for(let j=0;j<unitSlice[i].length;j++){
        if(unitSlice[i][j]!=='0'){
          charNum+=charList[unitSlice[i][j]]+lowUnitList[j]
        }
        else{
          charNum+=0
        }
        
      }
      charNumList.push(charNum)
    }

    allList.push(charNumList.join('万')+(k===len-1?'元':'亿'));
  
  }
  return allList.join('')
    .replace(/^(0{4}['千百拾万亿元'])+$/,'零元')
    .replace(/^(0+['千百拾万亿']?)+/,'')
    .replace(/0{4,}['千百拾万']/g,'')
    .replace(/0{1,4}(['千百拾万亿元'])/g,"$1")
    .replace(/0{1,3}['千百拾万']?/g,'零')
}

运行结果： 

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console.log(changeZN('100869778'));
// 壹亿零捌拾陆万玖千柒百柒拾捌元

ES6(node 12)

代码：

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function changeZN(num){
  const charList=[0, '壹', '贰', '叁', '肆','伍', '陆', '柒', '捌', '玖'];
  const lowUnitList= ['千','百','拾',''];
  let len =Math.ceil(num.length/8);
  let numSlice=num
  .padStart(len*8,0)
  .replace(/\B(?=(?:\d{8})+(?!\d))/g,",亿,")
  .split(",")
  .map(s=>(
      s
      .replace(/\B(?=(?:\d{4})+(?!\d))/,",万,")
      .split(",")
      .map((n)=>{
        if(/^\d{4}$/.test(n)&&n!=="0000"){
            return [].map.call(n,(c,i)=>{
                return c==="0"?c:charList[c]+lowUnitList[i]
            }).join("")
        }else{
            return n
        }
      })
  ))
  .flat()
  .join("")+"元";
  return (numSlice
    .replace(/^(0{4}['万亿元'])+$/,'零元')
    .replace(/(^(0+['万亿']?)+)|(0{4}['万'])/g,'')
    .replace(/0{1,4}(['万亿元'])/g,"$1")
    .replace(/0{1,3}/g,'零')
  )
}

PS:以上代码来自我的同事大佬。。。

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