使用setTimeout实现一个递归函数，希望把函数外的两个变量放到函数内，请问怎么实现？

Question

使用setTimeout实现一个递归函数，希望把函数外的两个变量放到函数内，请问怎么实现？

var aTime = null
var aCount = 0
function testSetTimeout() {
  aTime = setTimeout(function(){
    console.log('aCount == ', aCount)
    aCount += 1
 testSetTimeout()
  }, 2*1000)
}
testSetTimeout()

Answer 1

function testSetTimeout(aTime,aCount) {
  aTime = setTimeout(function(){
    console.log('aCount == ', aCount)
    aCount += 1
    testSetTimeout(aTime,aCount)
  }, 2*1000)
}
testSetTimeout(null,0)