codewars,js实现5kyu:Write out numbers(数字转化为英文写法)

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题目简介

该kata的链接地址
Create a function that transforms any positive number to a string representing the number in words. The function should work for all numbers between 0 and 999999.

Example

umber2words(0)  ==>  "zero"
number2words(1)  ==>  "one"
number2words(9)  ==>  "nine"
number2words(10)  ==>  "ten"
number2words(17)  ==>  "seventeen"
number2words(20)  ==>  "twenty"
number2words(21)  ==>  "twenty-one"
number2words(45)  ==>  "forty-five"
number2words(80)  ==>  "eighty"
number2words(99)  ==>  "ninety-nine"
number2words(100)  ==>  "one hundred"
number2words(301)  ==>  "three hundred one"
number2words(799)  ==>  "seven hundred ninety-nine"
number2words(800)  ==>  "eight hundred"
number2words(950)  ==>  "nine hundred fifty"
number2words(1000)  ==>  "one thousand"
number2words(1002)  ==>  "one thousand two"
number2words(3051)  ==>  "three thousand fifty-one"
number2words(7200)  ==>  "seven thousand two hundred"
number2words(7219)  ==>  "seven thousand two hundred nineteen"
number2words(8330)  ==>  "eight thousand three hundred thirty"
number2words(99999)  ==>  "ninety-nine thousand nine hundred ninety-nine"
number2words(888888)  ==>  "eight hundred eighty-eight thousand eight hundred eighty-eight"

我完成的代码

function number2words(n){// works for numbers between 0 and 999999   function toWord(n){//定义好特别的数字var a = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine","ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"],b = ["twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]//当n小于20时，可以直接获取if (n >= 0 && n < 20) return a[n];//当n大于等于20小于100时由...tyif (n >= 20 && n < 100) return b[Math.floor(n / 10) - 2] + (n % 10 ? '-' + a[n % 10] : '');//当n大于等于100小于1000时由...tyif (n >= 100 && n < 1000) return a[Math.floor(n / 100)] + ' hundred' + (n % 100 ? ' ' + toWord(n % 100) : '');//当n大于等于1000时return toWord(Math.floor(n / 1000)) + ' thousand' + (n % 1000 ? ' ' + toWord(n % 1000) : '');} return toWord(n)         
}