<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<div class='triangle'></div>
<script>
var triangle = document.querySelector('.triangle');
// 补全代码
//封装成函数,更具有通用性
function rightAngle(n){
let str = '';
//第一层循环 输出行
for (let i = 1; i <= n; i++ ){
//第二层循环输出列
for(let j=1; j<=i ; j++ ){
str += '*';
}
str += '<br/>'
}
return str;
}
//n可以是任意数字
triangle.innerHTML = rightAngle(n);
</script>
</body>
</html>