bet.js

var _ = require('lodash')

var base = 10000;

function win() {
	return ~~(Math.random() * 10000 % 2)
}


function bet(num) {
  var isWin = win()
  if (isWin) {
    return num * 0.9
  } else {
    return 0;
  }
}

function bet2(num) {
  base -= num

  if (base <= 0) {
    console.log('输完了')
    process.exit(0)
  }
  console.log('下注：', num, '，余额：', base)
  var winNum = bet(num)

  if (!winNum) {
    num *= 3
    bet2(num)
  } else {
    base += num + winNum
  }
}

_.range(1000).forEach(function () {
  bet2(1)
})

console.log('base', base)