数字转换成中文大写

fn
fn-ss

完成将 toChineseNum 函数，可以将数字转换成中文大写的表示，处理到万级别，

例如：toChineseNum(12345)，返回 一万二千三百四十五。

解法1：

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const toChineseNum = (num) => {
  const keys = ['零','一','二','三','四','五','六','七','八','九']
  var count = ['','十','百','千','亿']
  var str ='';
  var nums = num.toString().split('').reverse();
  nums.map(function (a, index) {
      str = (keys[a]+ ( a==0?'': count[index>3 ? index-4 : index]))+(index=='4'?'万':'')+str 
  })
  return str.replace(/(零(?=零))|(零$)|(零(?=万))/g,'')
}

解法2：

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const toChineseNum = (num) => {
  const unit = ['', '十', '百', '千']
  const counts = ['零', '一', '二', '三', '四', '五', '六', '七', '八', '九']

  const pre = Math.floor(num / 10000)
  const next = num % 10000

  let getfour = (mynum, flag = false) => {
        if(!mynum){return ''}
  	let i = 0, str = ''
  	
  	while(flag ? i < 4 : mynum > 0 ) {
  		count = mynum % 10
  		mynum = Math.floor(mynum / 10)
  		str = (count ? counts[count] + unit[i] : str[0] == '零' ? '' : str.length && i ? '零' : '') + str
  		i++
  	}
  	return str
  }
  
  return pre ? getfour(pre) + '万' + getfour(next, true) : getfour(num)
}

解法3：

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const toChineseNum = (num) => {
	const chiPos = ["千", "百", "十", ""];
	const chiNum = ["", "一", "二", "三", "四", "五", "六", "七", "八", "九"];

	if (num === 0) {
		return "零";
	}

	let symbol = "";
	if (num < 0) {
		num = -num;
		symbol = "-";
	}

	let result = "";
	num = num + "";
	let frontZeros = "0".repeat(chiPos.length - Math.floor(num.length % chiPos.length))//补足前导0
	let arr = (frontZeros + num).split("").map((e) => +e);
	
	//find first non-zero digit
	let i = 0;
	while (arr[i] === 0) {
		i++;
	}

	//开始处理数字
	let hasZero = false;
	while (i < arr.length) {
		if (arr[i] !== 0) {
			if (hasZero) {
				result += "零";
				hasZero = false;
			}
			result += chiNum[arr[i]] + chiPos[Math.floor(i % chiPos.length)];
		} else {
			// 每组末尾的0，不用兑现，设置为false
			if (Math.floor(i % chiPos.length) === 3) {
				hasZero = false;
			} else {
				hasZero = true;
			}
		}

		//判断是否加上"万""
		if (i < arr.length - chiPos.length
			&& Math.floor(i % chiPos.length) === 3) {
			result += "万";
		}

		i++;
	}

	return result;
}
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