php简单计算器实现

php简单计算器实现

<?php
header("content-type:text/html;charset=utf-8");
//error_reporting( E_ALL&~E_NOTICE );
/**
 * Created by PhpStorm.
 * User: zk
 * Date: 2017/8/24
 * Time: 21:03
 */
?>

<?php
$num1 = isset($_GET['num1'])?$_GET['num1']:'';
$num2 = isset($_GET['num2'])?$_GET['num2']:'';
$symbol = isset($_GET['symbol'])?$_GET['symbol']:'';
$result = "";
    switch ($symbol){
        case "+":
            $result = $num1 + $num2;
            break;
        case "-":
            $result = $num1 - $num2;
            break;
        case "*":
            $result = $num1 * $num2;
            break;
        case "/":
            $result = $num1 / $num2;
            break;
    }
?>
<!--简单计算器-->
<form action="" method="get" onsubmit="return function() {}" id="form1">
    <script src="js/jquery.min.js"></script>
    <input type="text" name="num1" id="num1" placeholder="请输入数字" value="<?php echo $num1;?>">
    <select name="symbol" id="symbol">
        <option value="+" <?php if($symbol == "+"){ echo "selected";}?>>+</option>
        <option value="-" <?php if($symbol == "-"){ echo "selected";}?>>-</option>
        <option value="*" <?php if($symbol == "*"){ echo "selected";}?>>*</option>
        <option value="/" <?php if($symbol == "/"){ echo "selected";}?>>/</option>
    </select>
    <input type="text" name="num2" id="num2" placeholder="请输入数字" value="<?php echo $num2;?>">
    <input type="button" value="计算" id="btn">
    <input type="text" name="result" value="<?php echo $result;?>">
</form>
<a href="ji-suan-qi.php">刷新</a>
<script>
    $("#btn").click(function () {
        var num2 = Number($("#num2").val());
        var symbol = $("#symbol").val();
//        alert(1);
        if(symbol == "/"){
            if(num2 == 0){
                alert("除数不能为0");
                return false;
            }
        }

        $("#form1").submit();
    })
</script>