caller和caller

npm init -y
yarn add vite -D

{
  "name": "demo1",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "vite --port 3002"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "vite": "^4.4.9"
  }
}

function test(a,b,c){
    console.log(arguments.callee.length)
    console.log(test.length)
    console.log(arguments.length)
}
test(1,2)

function test1(){
    console.log(arguments.callee)
    function test2(){
        console.log(arguments.callee)
    }
    test2()
}
test1()


function sum(n){
    if(n<=1){
        return 1
    }
    return n+sum(n-1)
}
var res=sum(10)
console.log(res)

var sum=(function(n){
    if(n<=1){
        return 1
    }
    return n+arguments.callee(n-1)
})(10)
console.log(sum)

function test1(){
    test2()
}
function test2(){
    console.log(test2.caller)
}
test1()