这个代码为什么没法运行呢? 网页直接无法显示
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>计算</title>
</head><body>
<form method="post">
<input type="text" name="number1">
<select name=lable size=1 face="黑体">
<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 "结果为".$r;
else
echo "请重新输入";
?>
</body>
</html>
#
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