用js写简易计算器-优快云博客

本文链接：https://blog.youkuaiyun.com/m0_63338784/article/details/129822814

博客围绕前端开发展开，涉及HTML、CSS和JavaScript。HTML用于构建网页结构，CSS负责页面样式设计，JavaScript实现网页交互功能，三者是前端开发的核心技术。

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
         .wrapper{
            width: 300px;
            height: 300px;
            background-color: #6c6c6c;
        }
        .first{
            width: 100%;
            height: 100px;
        }
        .second{
            width: 100%;
            height: 200px;
            background-color: #11b006;
        }
        #kuang{
            display: inline-block;
            width: 200px;
            height: 60px;
            margin-left: 50px;
            margin-top: 10px;
            background-color: #fff;
            outline: none;
        }
        button{
            width: 55px;
            height: 30px;
            margin: 10px;
            float: left;
        }

    </style>
</head>
<body>
    <div class="wrapper">
        <div class="first">
            <input type="text" id="kuang">
        </div>
        <div class="second">
            
            <button class="aa" onclick="cc(1)">1</button>
            <button class="aa" onclick="cc(2)">2</button>
            <button class="aa" onclick="cc(3)">3</button>
            <button class="aa" onclick="cc(5)">5</button>
            <button class="aa" onclick="cc(6)">6</button>
            <button class="aa" onclick="cc(7)">7</button>
            <button class="aa" onclick="cc(8)">8</button>
            <button class="aa" onclick="jisuan()">=</button>
            <button class="aa" onclick="cc('+')">+</button>
            <button class="aa" onclick="cc('-')">-</button>
            <button class="aa" onclick="cc('*')">*</button>
            <button class="aa" onclick="cc('/')">/</button>

        </div>
        <script>
            let str="";//空串，最终算式
            let _kuang=document.getElementById("kuang");
            function cc(params){
                str+=params;
                _kuang.value=str;
            }
            function jisuan(){
                let res=eval(str);
                _kuang.value=res;
                str='';
            }
        </script>
    </div>
</body>
</html>