SOURCE

function calc(n) {
    let result= 1;
    for (let i=1; i<=n; i++) {
        result = result * i;
    }
    return result;
}

function multiTable() {
    for (let i=1; i<=9; i++) {
        let s = '';
        for (let j=1; j<=i; j++) {
            s += i + '*' + j + '=' + i*j+ '  ';
            // console.log(i + '*' + j + '=' + i*j+ '  ');
        }
        console.log(s+ '\n');
    }
}

// console.log(calc(2));

// console.log(calc(4));
// multiTable()

let s = 'hello';
let n = 3;
let bt = true;
let bf = false;

let x;
x = 100;
console.log(s, n, bt, bf);

let score = 60;
if (score >= 90) {
    s = '优秀';
} else if (score >= 80) {
    s = '良';
} else if (score >= 70) {
    s = '中'
} else if (score >= 60) {
    s = '差'
} else {
    s = '不及格'
}
console.log(s);

let i=1;
while(i<=5) {
    console.log(i);
    i= i +1;
}