js打印正三角實現方法

js打印正三角

<div id="triangle"></div>
    <style>
        #triangle{font-size: 30px;}
    </style>
    <script>
        let str='';
        let ele = document.getElementById('triangle');
        function triangle(num=3){
            for (let i = 0; i <= num; i++) {
                    str = i+1;
                    ele.innerHTML += "*   ".repeat(str)+"<br/>";
            }
        }
        triangle(9)

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