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/
js_16.html

<html>
<head>
    <meta charset="UTF-8">
    <title>IFE ECMAScript</title>
</head>
<body>
    <input id="first-number" type="number" value="0" placeholder="第一个数字">
    <input id="second-number" type="number" value="0" placeholder="第二个数字">
    <button id="add-btn">加</button>
    <button id="minus-btn">减</button>
    <button id="times-btn">乘</button>
    <button id="divide-btn">除</button>
    <p id="result">运算结果</p>
    <script>
        document.getElementById("add-btn").onclick=function(){
            var n1 = document.getElementById("first-number").value;
            var n2 = document.getElementById("second-number").value;
            var Text = Number(n1)+Number(n2);
            document.getElementById("result").innerHTML = Text;
        }
        document.getElementById("minus-btn").onclick=function(){
            var n1 = document.getElementById("first-number").value;
            var n2 = document.getElementById("second-number").value;
            var Text = Number(n1)-Number(n2);
            document.getElementById("result").innerHTML = Text;
        }
        document.getElementById("times-btn").onclick=function(){
            var n1 = document.getElementById("first-number").value;
            var n2 = document.getElementById("second-number").value;
            var Text = Number(n1)*Number(n2);
            document.getElementById("result").innerHTML = Text;
        }
        document.getElementById("divide-btn").onclick=function(){
            var n1 = document.getElementById("first-number").value;
            var n2 = document.getElementById("second-number").value;
            var Text = Number(n1)/Number(n2);
            document.getElementById("result").innerHTML = Text;
        }
    </script>
</body>
</html>