html+js实现的简单计算器(加减乘除)

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>
<table>
    <tr>
      <td><input type="button" value="add"     onclick="setOp('+', 'add');"/></td>
      <td><input type="button" value="miner"  onclick="setOp('-', 'miner');"/></td>
      <td><input type="button" value="times"  onclick="setOp('*', 'times');"/></td>
      <td><input type="button" value="divide" onclick="setOp('/', 'divide');"/></td>
    </tr>
</table>
<table id="tb_calc" style="display:none;">
     <tr>
        <td> <input id="x" type="text" style="width:100px" value="" name="x" /></td>
        <td> <lable id="op"  name="op"></lable> </td>
        <td> <input id="y" type="text" style="width:100px" value="" name="y" /> </td>
        <td> <input id="opTips" type="button" value="" onclick="calc();"/> </td>
        <td> <lable id="z" name="z"></lable> </td>
    </tr>
</table>
<script type="application/javascript">
    function setOp(op, opTips)
    {
        var tb=document.getElementById("tb_calc");
        tb.style.display = "none";
                    
        document.getElementById("x").value = ""; 
        document.getElementById("y").value = ""; 
        document.getElementById("z").innerText = ""; 
        document.getElementById("op").innerText = op;
        document.getElementById("opTips").value = opTips;
        
        tb.style.display = "block";
    }
    function calc()
    {
        var x  = parseInt(document.getElementById("x").value); 
        var y  = parseInt(document.getElementById("y").value);
        var op = document.getElementById("op").innerText;
        
        var z = "";
        switch(op)
        {
            case '+':
                z = x + y;
                break;
            case '-':
                z = x - y;
                break;
            case '*': ;
                z = x * y;
                break;
            case '/': ;
                z = x / y;
                break;
            default:
                z = '';
        }
        console.log(x, op, y, '=', z);
        document.getElementById("z").innerText = z;
    }
</script>
</body>
</html>


截图如下:

html+js实现的简单计算器(加减乘除)_第1张图片


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