JavaScript 函数

var num = 10


function  func() {
    var num1 =20
    num =20
    console.log("num1 ="+ num1)

}

func()

console.log ("num = "+ num)

============================

function func (){
    var num = 20
     p =30
    console.log(p)
}

func()

//报错p是局部变量
console.log(P)