console 命令行工具 X clear

console

let a=4;

switch(a){
  case a===1:
      console.log(1)
      return 1
  case a===4 || a===3 ||  a===2:
      console.log(2)
      return 2
  default:
      console.log(5)
      return 3
}

<div>dg</div>