鼠年全馬鐵人挑戰 - 1-5

sampleBlock.js

var x = 1;
{
  var x = 2;
  console.log(x)
}
console.log(x)
// console 會印出 2 跟 2

let x = 1;
{
  let x = 2;
  console.log(x)
}
console.log(x)
// console 會印出 2 跟 1