js实现极为简单的计算器 -

超简便的计算器

<!doctype html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="Generator" content="EditPlus®">
        <meta name="Author" content="">
        <meta name="Keywords" content="">
        <meta name="Description" content="">
        <title>calculator</title>
    </head>
    <body>
        <div>
            <span>第一个数</span>
            <input type="" name="" id="number1" value="" />
            <br>
            <span>第二个数</span>
            <input type="" name="" id="number2" value="" />
            <br>
            <input type="submit" value="+" onclick="add()">
            <input type="submit" value="-" onclick="delect()">
            <input type="submit" value="*" onclick="mul()">
            <input type="submit" value="/" onclick="divi()">
            <div id="">
                <span>计算结果:</span><span id="result"></span>
            </div>
        </div>
        <script type="text/javascript">
            //加法
            function add() {
                add1 = Number(document.getElementById("number1").value);
                add2 = Number(document.getElementById("number2").value);
                var sum;
                sum = add1 + add2;
                document.getElementById("result").innerHTML = sum;
            }
            //减法
            function delect() {
                add1 = Number(document.getElementById("number1").value);
                add2 = Number(document.getElementById("number2").value);
                var sum;
                sum = add1 - add2;
                document.getElementById("result").innerHTML = sum;
            }
            //乘法
            function mul() {
                add1 = Number(document.getElementById("number1").value);
                add2 = Number(document.getElementById("number2").value);
                var sum;
                sum = add1 * add2;
                document.getElementById("result").innerHTML = sum;
            }
            //除法
            function divi() {
                add1 = Number(document.getElementById("number1").value);
                add2 = Number(document.getElementById("number2").value);
                var sum;
                sum = add1 / add2;
                document.getElementById("result").innerHTML = sum;
            }
        </script>
    </body>
</html>