我使用创建了一个金字塔JavaScript，下面是我迄今为止使用 for 循环尝试的代码：function showPyramid() { var rows = 5; var output = ''; for (var i = 1; i <= rows; i++) { //Outer loop for (var j = 1; j <= i; j++) { //Inner loop output += '* '; } console.log(output); document.getElementById('result').innerHTML = output; output = ''; }}很基础！但是我正在尝试将结果与HTML元素绑定，例如使用div如下：document.getElementById('result').innerHTML = output;相反，它连续显示五颗星，而不是在控制台中看到的 JS 格式。我在这里缺少什么吗？完整代码：<head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Pyramid</title> <script> function showPyramid() { var rows = 5; var output = ''; for (var i = 1; i <= rows; i++) { for (var j = 1; j <= i; j++) { output += '* '; } console.log(output); document.getElementById('result').innerHTML = output; output = ''; } } </script></head><body onload="showPyramid();"> <h1>Pyramid</h1> <div id="result"></div></body>
2 回答
慕雪6442864
TA贡献1812条经验 获得超5个赞
目前，您innerHTML在每次循环迭代结束时重置；要么使用+=附加 HTML，要么先将所有输出附加在一起，然后设置innerHTML. 此外，您将需要使用<br>标签在HTML.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Pyramid</title>
<script>
function showPyramid() {
var rows = 5;
var output = '';
for (var i = 1; i <= rows; i++) {
for (var j = 1; j <= i; j++) {
output += '* ';
}
output += "<br/>";
}
document.getElementById('result').innerHTML += output;
}
</script>
</head>
<body onload="showPyramid();">
<h1>Pyramid</h1>
<div id = "result"></div>
</body>
</html>
湖上湖
TA贡献2003条经验 获得超2个赞
const result = document.querySelector("#result");
function generatePyramid(max = 5) {
result.innerHTML = "";
const length = 2 * max - 1;
for (let i = 1; i <= max; i++) {
let s = "*".repeat(i).split("").join(" ");
s = s.padStart(
s.length + Math.floor((length - s.length) / 2)
).padEnd(length);
const div = document.createElement("div");
div.innerHTML = s.replace(/\s/g, " ");
result.appendChild(div);
}
}
// generatePyramid(); // base 5 stars
generatePyramid(11); // base 11 stars
// generatePyramid(21); // base 21 stars
<h1>Pyramid</h1>
<div id="result"></div>
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