float.js

function repeatChar(char, times) {
  if (typeof String.prototype.repeat === 'function') {
    return char.repeat(times)
  }
  let count = 0
  const array = []
  while (count < times) {
    count += 1
    array.push(char)
  }
  return array.join('')
}

export function genFloat(value, num = 1) {
  const integer = parseInt(`${value}`, 10)
  const float = parseFloat(value, 10) - integer
  if (float === 0) {
    return ['.', repeatChar('0', num)].join('')
  }
  const ratio = Math.pow(10, num)
  return String(Math.round(float * ratio) / ratio).substr(1)
}

export function gen(value, num) {
  const integer = parseInt(value, 10)
  const float = genFloat(value, num)
  return `${integer}${float}`
}