2
1812<form>
<input type="text" name="num1">
<select name="fh">
<option value="jia">+</option>
<option value="jian">-</option>
<option value="chen" >*</option>
<option value="chu">/</option>
<option value="quzhi">%</option>
</select>
<input type="text" name="num2">
<input type="button" value="提交">
</form>
<?php
$num1=$_GET["num1"];
$num2=$_GET["num2"];
$a=$_GET['fh'];
if(!is_numeric($num1)||!is_numeric($num2)){
echo "请输入数字";
}
if($a=="jia"){
echo $num1.'+'.$num2.'='.($num1+$num2);
}
if($a=="jian"){
echo $num1.'-'.$num2.'='.($num1-$num2);
}
if($a=="chen"){
echo $num1.'*'.$num2.'='.($num1*$num2);
}
if($a=="chu"){
echo $num1.'/'.$num2.'='.($num1/$num2);
}
if($a=="quzhi"){
echo $num1.'%'.$num2.'='.($num1%$num2);
}
?>如题
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是的，button只是按钮属性，是没有提交表单的功能的，除非是用到ajax提交才会用button~
<form action='' method="get"> <input type="text" name="num1"> <select name="fh"> <option value="jia">+</option> <option value="jian">-</option> <option value="chen" >*</option> <option value="chu">/</option> <option value="quzhi">%</option> </select> <input type="text" name="num2"> <!-- <input type="button" value="提交"> --> <input type="submit" name="submit" value="提交"> </form> <?php if(isset($_GET['submit'])){ $num1=$_GET["num1"]; $num2=$_GET["num2"]; $a=$_GET['fh']; if(!is_numeric($num1)||!is_numeric($num2)){ echo "请输入数字"; } if($a=="jia"){ echo $num1.'+'.$num2.'='.($num1+$num2); } if($a=="jian"){ echo $num1.'-'.$num2.'='.($num1-$num2); } if($a=="chen"){ echo $num1.'*'.$num2.'='.($num1*$num2); } if($a=="chu"){ echo $num1.'/'.$num2.'='.($num1/$num2); } if($a=="quzhi"){ echo $num1.'%'.$num2.'='.($num1%$num2); } } ?>代码我帮你改了一下，首先提交时类型为submit而不是用button，而且你的表单的action和method最好显式写出来，虽然不写是用get方式默认传到本页面；然后，php代码最好先判断是否接收到提交，如果不判断是否接收到提交，最开始会有警告