4.10 双层循环输出九九乘法表
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script type="text/javascript">
for (var i=1;i<=9;i++){
for (var j=1;j<=i;j++){
document.write(i+"Ⅹ"+j+"="+i*j," ")
}
document.write("<br>")
}
</script>
</head>
<body>
</body>
</html>
返回：
1×1=1
2×1=2 2×2=4
3×1=3 3×2=6 3×3=9
4×1=4 4×2=8 4×3=12 4×4=16
5×1=5 5×2=10 5×3=15 5×4=20 5×5=25
6×1=6 6×2=12 6×3=18 6×4=24 6×5=30 6×6=36
7×1=7 7×2=14 7×3=21 7×4=28 7×5=35 7×6=42 7×7=49
8×1=8 8×2=16 8×3=24 8×4=32 8×5=40 8×6=48 8×7=56 8×8=64
9×1=9 9×2=18 9×3=27 9×4=36 9×5=45 9×6=54 9×7=63 9×8=72 9×9=81