12.6Day10

function chengji (num1,num2) {
    return num1*num2
}
let a = chengji(2 , 3)
console.log(a)



for (let b = 1 ; b <= 100 ; b++ ){
    let c=String(b)
    let d = c.match(/7/)
    console.log(d)
}

for (let month = 4 ; month <= 20 ; month++){
    function tuzi(p) {
        if(month<=20){
            return tuzi(p)*2
        }

    }

}
console.log(tuzi(1))