基于JavaScript實現(xiàn)簡易計算器

更新時間：2021年06月22日 09:05:57 作者：妄癡夢中

這篇文章主要為大家詳細介紹了基于JavaScript實現(xiàn)簡易計算器，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了JavaScript實現(xiàn)簡易計算器的具體代碼，供大家參考，具體內(nèi)容如下

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>計算器</title>
    <style>
        .op {
            margin: 50px auto;
            width: 300px;
            height: 300px;
            border: 1px solid orange;
            background-color: lightskyblue;
            border-radius: 50px;
        }

        input {
            width: 210px;
            height: 30px;
            border-radius: 5px;
        }

        button {
            width: 30px;
            height: 30px;
            border-radius: 10px;
        }
    </style>
</head>
<body>
<div class="op">
    <h2 align="center">計算器</h2>
    <form name="calculator">
        <table align="center">
            <tr>
                <td>num1:</td>
                <td><input type="text" name="num1"></td>
            </tr>
            <tr>
                <td>num2:</td>
                <td><input type="text" name="num2"></td>
            </tr>
            <tr>
                <td colspan="2">&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp
                    <button type="button">+</button>
                    &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp
                    <button type="button">-</button>
                    &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp
                    <button type="button">*</button>
                    &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp
                    <button type="button">/</button>
                </td>
            </tr>
            <tr>
                <td>結果：</td>
                <td><input type="text" name="result" disabled></td>
            </tr>
        </table>
    </form>
</div>
<script>
    //得到標簽名下的所有元素對象，返回一個數(shù)組
    let buttonArr = document.getElementsByTagName("button");
    for (let but of buttonArr) {
        but.addEventListener('click', function () {
            let operator = this.innerHTML;
            count(operator);
        });
    }

    function count(operator) {
        //得到form為calculator中name為num1的輸入值
        let num1 = parseFloat(document.calculator.num1.value);
        let num2 = parseFloat(document.calculator.num2.value);
        let result = '';
        switch (operator) {
            case '+':
                result = num1 + num2;
                break;
            case '-':
                result = num1 - num2;
                break;
            case '*':
                result = num1 * num2;
                break;
            case '/':
                if (num2 == 0) {
                    alert("除數(shù)不能為零");
                    return;
                }
                result = num1 / num2;
                break;
        }
//將結果賦值于屬性名name為result的input框
        document.calculator.result.value = result;
    }
</script>
</body>
</html>

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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