需要使用两个for循环嵌套,代码如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>九九乘法表</title>
</head>
<body>
<script>
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>
</body>
</html>