SOURCE

for (let i = 1; i < 10; i++) {
    for (let j = 1; j < i + 1; j++) {
        let out = "";
        out += j;
        out += "X";
        out += i;
        out += "="
        out += (i * j);
        console.log(out);
    }
    console.log('\n');
}