题解 | #直角三角形#

<script>
            var triangle = document.querySelector('.triangle');
            // 补全代码
            let htmlStr = ""
            for(let i = 1; i <= 3; i++){
                for(let j = 1; j <= i;j++){
                    if(j == i) {
                        htmlStr += `<span>*</span></br>`
                        break;
                    }
                     htmlStr += `<span>*</span>`
                }
            }
            triangle.innerHTML = htmlStr
        </script>