SOURCE

for (let i = 1; i <= 4; i++) {
    let temp = "";
    for (let j = 1; j <= 4 - i; j++) {
        temp += "\xa0";
    }
    for (let k = 1; k <= 2 * i - 1; k++) {
        temp += "*";
    }
    console.log(temp);
    }
    for (let i = 1; i <= 3; i++) {
        let temp = "";
        for (let j = 1; j <= i; j++) {
        temp += "\xa0";
    }
        for (let k = 1; k <= 7 - 2 * i; k++) {
        temp += "*";
    }
console.log(temp);
}

<script src="ling.js"></script>