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JavaScript-循环嵌套规律

需求

  • 要求往界面中打印​​****​
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Demo</title>
<script type="text/javascript">
document.write("****");
</script>
</head>
<body>
</body>
</html>

JavaScript-循环嵌套规律_html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Demo</title>
<script type="text/javascript">
document.write("*");
document.write("*");
document.write("*");
document.write("*");
</script>
</head>
<body>
</body>
</html>

JavaScript-循环嵌套规律_html

  • 要求往界面中打印​​三行​​​、​​****​
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Demo</title>
<script type="text/javascript">
for (let i = 0; i < 4; i++) {
document.write("*");
}

document.write("<br>");

for (let i = 0; i < 4; i++) {
document.write("*");
}

document.write("<br>");

for (let i = 0; i < 4; i++) {
document.write("*");
}
</script>
</head>
<body>
</body>
</html>

JavaScript-循环嵌套规律_html_03

在循环嵌套中外循环控制的是 ​​行数​​​, 内循环控制的是 ​​列数​​。

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Demo</title>
<script type="text/javascript">
for (let j = 0; j < 3; j++) {

for (let i = 0; i < 4; i++) {
document.write("*");
}

document.write("<br>");
}
</script>
</head>
<body>
</body>
</html>

JavaScript-循环嵌套规律_html_03




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