JavaScript面试题

var num1 = 100;var num2 = new Number(100)
var str1 = 'message';var str2 = new String('message')
var bool1 = true;var bool2 = new Boolean(true)
   
var arr1 = [];var arr2 = new Array();

var msg;

var msg = undefined;

function fn() {
  console.log("1");
}

function fn() {
  return undefined;
}

var obj = {
    name:'李雷',
    age:18
}
console.log(obj.job);