這個代碼為什么沒法運行呢? 網頁直接無法顯示
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>計算</title>
</head><body>
<form method="post">
<input type="text" name="number1">
<select name=lable size=1 face="黑體">
<option>+</option>
<option>-</option>
<option>*</option>
<option>/</option>
</select>
<input type="text" name="nunber2">
<input type="submit" name="button" value="提交">
</form>
<? php
function yx ($s1,$s2,$b)
{
if($b=="+")
return ($s1+$s2);
else if ($b=="-")
return ($s1-$s2);
else if ($b=="*")
return ($s1*$s2);
else
return($s1/$s2);
}
if(isset($_POST['button']))
$s1=$_POST["number1"];
$s2=$_POST["number2"];
$b=$_POST["lable"];
if(is_nameric($s1)&&is_nameric($s2))
$r=yx($s1,$s2,$b);
echo "結果為".$r;
else
echo "請重新輸入";
?>
</body>
</html>
1
0
0
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
