我有这行代码（php）：
<!DOCTYPE html>
<html>
<head>
<title> okay</title>
</head>
<body>
<?php
echo "<table border=2>";
for ($i = 1; $i <= 10; $i++ ) {
echo "<tr>";
echo "<td >".$i."</td>";
for ( $j = 2; $j <= 10; $j++ ) {
echo "<td>".$i * $j."</td>";
}
echo "</tr>";
}
echo "</table>";
?>
</body>
</html>
我希望偶数的背景颜色变为绿色（白色字体），奇数变为红色（黑色字体）。我怎样才能做到这一点 ？
使用php的%运算符来确定奇数/偶数行
<!DOCTYPE html>
<html>
<head>
<title> okay</title>
</head>
<body>
<?php
echo "<table border=2 >";
for ($i = 1; $i <= 10; $i++ ) {
$style="background:red;color:black";
if($i%2==0)
$style="background:green;color:white";
echo "<tr style=$style>";
echo "<td >".$i."</td>";
for ( $j = 2; $j <= 10; $j++ ) {
echo "<td>".$i * $j."</td>";
}
echo "</tr>";
}
echo "</table>";
?>
</body>
</html>
或者简单地用css：
tr:nth-of-type(odd)
{
background:red;color:black;
}
tr:nth-of-type(even)
{
background:green;color:white;
}
编辑
如果要在值为奇数/偶数时更改颜色。尝试以下代码：
<!DOCTYPE html>
<html>
<head>
<title> okay</title>
</head>
<body>
<?php
echo "<table border=2 >";
for ($i = 1; $i <= 10; $i++ ) {
echo "<tr >";
$style="background:red;color:black";
if($i%2==0)
$style="background:green;color:white";
echo "<td style=$style>".$i."</td>";
for ( $j = 2; $j <= 10; $j++ ) {
$val = ($i * $j);
$style="background:red;color:black";
if($val%2==0)
$style="background:green;color:white";
echo "<td style=$style>".$val."</td>";
}
echo "</tr>";
}
echo "</table>";
?>
</body>
</html>
我添加了部分来检查奇数甚至是您选择的打印件
<!DOCTYPE html>
<html>
<head>
<title> okay</title>
</head>
<body>
<?php
echo "<table border=2>";
for ($i = 1; $i <= 10; $i++ ) {
echo "<tr>";
echo "<td >".$i."</td>";
for ( $j = 2; $j <= 10; $j++ ) {
if(($i*$j)%2==0)
echo "<td style="color:white;background-color:green">".$i * $j."</td>";
else
echo "<td style="color:black;background-color:red">".$i * $j."</td>";
}
echo "</tr>";
}
echo "</table>";
?>
</body>
</html>
试试这个：
<?php
if ($i % 2 != "0") # An odd row
$rowColor = "green";
else # An even row
$rowColor = "orange";
?>