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前端新手第一课用 50 行代码写一个网页计算器

  • 2026-05-11 09:24:00
前端新手第一课用 50 行代码写一个网页计算器

如果你刚开始学前端开发,可能觉得做个项目还很遥远。但其实,一个能用的小项目,就是最好的老师。

今天我们来做一个网页计算器。它看起来简单,但涉及了 HTMLCSSJavaScript 三大核心技术,是理解前端开发思维的绝佳入门项目。

最终效果:一个支持加减乘除的计算器,有显示屏、按键盘、清除和等号功能。完整代码不到 50 行。

先看效果

在开始写代码之前,先看看我们要做什么。最终的计算器长这样:

思路分析:计算器由什么组成?

在动手写代码之前,我们先拆解一下计算器的结构。一个简单的计算器其实只需要三个部分:

部分

技术

作用

显示屏

HTML <input>

显示用户输入的数字和计算结果

按键盘

HTML <table>

用表格布局排列数字和运算符按钮

逻辑

JavaScript

处理点击事件,执行计算

理解了这三个部分,接下来就是把它们组装起来。

第一步:搭建 HTML 结构

我们用 HTML 的 <table> 标签来搭建计算器的布局。为什么用表格?因为计算器的按键本身就是一个规整的网格布局,用表格是最直观的方式。

整体结构分为四部分:

1.显示屏:一个跨越 4 列的 <input> 文本框

2.数字键 7-9:第一行,含加号

3.数字键 4-6:第二行,含减号

4.数字键 1-3:第三行,含乘号

5.底部:0、小数点、除号、清除、等号

核心 HTML 结构如下:

@font-face{font-family:"Times New Roman";}@font-face{font-family:"宋体";}@font-face{font-family:"Arial";}@font-face{font-family:"微软雅黑";}@font-face{font-family:"Consolas";}p.MsoNormal{mso-style-name:正文;mso-style-parent:"";margin:0pt;margin-bottom:.0001pt;mso-pagination:none;text-align:justify;text-justify:inter-ideograph;font-family:Arial;mso-fareast-font-family:微软雅黑;font-size:11.0000pt;}span.msoIns{mso-style-type:export-only;mso-style-name:"";text-decoration:underline;text-underline:single;color:blue;}span.msoDel{mso-style-type:export-only;mso-style-name:"";text-decoration:line-through;color:red;}table.MsoNormalTable{mso-style-name:普通表格;mso-style-parent:"";mso-style-noshow:yes;mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-padding-alt:0.0000pt 5.4000pt 0.0000pt 5.4000pt;mso-para-margin:0pt;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-family:'Times New Roman';font-size:10.0000pt;mso-ansi-language:#0400;mso-fareast-language:#0400;mso-bidi-language:#0400;}@page{mso-page-border-surround-header:no;	mso-page-border-surround-footer:no;}@page Section0{}div.Section0{page:Section0;}<!-- 显示屏 --><tr>  <td colspan="4">    <input type="text" id="nummessege">  </td></tr><!-- 按键示例 --><tr>  <td><input type="button" value="7" onclick="onclicknum(7)"></td>  <td><input type="button" value="8" onclick="onclicknum(8)"></td>  <td><input type="button" value="9" onclick="onclicknum(9)"></td>  <td><input type="button" value="+" onclick="onclicknum('+')"></td></tr>

知识点

colspan="4" 表示这个单元格跨越 列,让显示屏占据整行宽度。onclick 属性绑定了点击事件,用户按下按钮时会触发对应的 JavaScript 函数。

◆ 第二步:添加样式

光有结构还不够,我们需要一点 CSS 让计算器看起来像个计算器。这里只用了非常简单的样式:
@font-face{font-family:"Times New Roman";}@font-face{font-family:"宋体";}@font-face{font-family:"Arial";}@font-face{font-family:"微软雅黑";}@font-face{font-family:"Consolas";}p.MsoNormal{mso-style-name:正文;mso-style-parent:"";margin:0pt;margin-bottom:.0001pt;mso-pagination:none;text-align:justify;text-justify:inter-ideograph;font-family:Arial;mso-fareast-font-family:微软雅黑;font-size:11.0000pt;}span.msoIns{mso-style-type:export-only;mso-style-name:"";text-decoration:underline;text-underline:single;color:blue;}span.msoDel{mso-style-type:export-only;mso-style-name:"";text-decoration:line-through;color:red;}table.MsoNormalTable{mso-style-name:普通表格;mso-style-parent:"";mso-style-noshow:yes;mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-padding-alt:0.0000pt 5.4000pt 0.0000pt 5.4000pt;mso-para-margin:0pt;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-family:'Times New Roman';font-size:10.0000pt;mso-ansi-language:#0400;mso-fareast-language:#0400;mso-bidi-language:#0400;}@page{mso-page-border-surround-header:no;	mso-page-border-surround-footer:no;}@page Section0{}div.Section0{page:Section0;}<style>  input {    width100%;       /* 按钮自动填满单元格 */    height40px;      /* 按钮高度 */    font-size18px;   /* 字体大小 */  }  td:hover {    background-color#4A90D9;  /* 鼠标悬停变色 */    color: white;  }</style>

其实就两个样式:让按钮自动填满单元格,以及鼠标悬停时变色。这就是 CSS 的魅力——少量代码,明显提升体验。

◆ 第三步:实现计算逻辑

这是最核心的部分。我们需要三个函数,各司其职:

函数

功能说明

onclicknum(nums)

将用户点击的数字或运算符追加到显示屏末尾

onclickclear()

清空显示屏中的所有内容

onclickresult()

读取显示屏中的表达式,调用 eval() 计算结果

完整的 JavaScript 代码:
@font-face{font-family:"Times New Roman";}@font-face{font-family:"宋体";}@font-face{font-family:"Arial";}@font-face{font-family:"微软雅黑";}@font-face{font-family:"Consolas";}p.MsoNormal{mso-style-name:正文;mso-style-parent:"";margin:0pt;margin-bottom:.0001pt;mso-pagination:none;text-align:justify;text-justify:inter-ideograph;font-family:Arial;mso-fareast-font-family:微软雅黑;font-size:11.0000pt;}span.msoIns{mso-style-type:export-only;mso-style-name:"";text-decoration:underline;text-underline:single;color:blue;}span.msoDel{mso-style-type:export-only;mso-style-name:"";text-decoration:line-through;color:red;}table.MsoNormalTable{mso-style-name:普通表格;mso-style-parent:"";mso-style-noshow:yes;mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-padding-alt:0.0000pt 5.4000pt 0.0000pt 5.4000pt;mso-para-margin:0pt;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-family:'Times New Roman';font-size:10.0000pt;mso-ansi-language:#0400;mso-fareast-language:#0400;mso-bidi-language:#0400;}@page{mso-page-border-surround-header:no;	mso-page-border-surround-footer:no;}@page Section0{}div.Section0{page:Section0;}<script>var numresult;var str;// 点击数字或运算符:追加到显示屏function onclicknum(nums) {  str = document.getElementById("nummessege");  str.value = str.value + nums;}// 清除显示屏function onclickclear() {  str = document.getElementById("nummessege");  str.value = "";}// 计算结果function onclickresult() {  str = document.getElementById("nummessege");  numresult = eval(str.value);  str.value = numresult;}</script>

关于 eval() 的说明

eval() 可以将字符串当作 JavaScript 代码执行。比如用户输入 "1+2*3"eval() 会返回 7。这在学习阶段非常方便,但在生产环境中使用 eval() 存在安全风险,后续可以用更安全的方式替代。

完整代码

将以上三部分合并,就是完整的计算器代码。复制下面的代码,保存为 calculator.html,双击用浏览器打开即可使用:

@font-face{font-family:"Times New Roman";}@font-face{font-family:"宋体";}@font-face{font-family:"Arial";}@font-face{font-family:"微软雅黑";}@font-face{font-family:"Consolas";}p.MsoNormal{mso-style-name:正文;mso-style-parent:"";margin:0pt;margin-bottom:.0001pt;mso-pagination:none;text-align:justify;text-justify:inter-ideograph;font-family:Arial;mso-fareast-font-family:微软雅黑;font-size:11.0000pt;}span.msoIns{mso-style-type:export-only;mso-style-name:"";text-decoration:underline;text-underline:single;color:blue;}span.msoDel{mso-style-type:export-only;mso-style-name:"";text-decoration:line-through;color:red;}table.MsoNormalTable{mso-style-name:普通表格;mso-style-parent:"";mso-style-noshow:yes;mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-padding-alt:0.0000pt 5.4000pt 0.0000pt 5.4000pt;mso-para-margin:0pt;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-family:'Times New Roman';font-size:10.0000pt;mso-ansi-language:#0400;mso-fareast-language:#0400;mso-bidi-language:#0400;}@page{mso-page-border-surround-header:no;	mso-page-border-surround-footer:no;}@page Section0{}div.Section0{page:Section0;}<!DOCTYPE html><htmllang="en"><head>    <metacharset="UTF-8">    <title>计算器</title>    <style>        input { width100%; }        td:hover { background-color#4A90D9color: white; }    </style>    <script>        var numresult, str;        function onclicknum(nums) {            str = document.getElementById("nummessege");            str.value = str.value + nums;        }        function onclickclear() {            str = document.getElementById("nummessege");            str.value = "";        }        function onclickresult() {            str = document.getElementById("nummessege");            numresult = eval(str.value);            str.value = numresult;        }    </script></head><body><tableborder="1">    <thead>    <tr>        <tdcolspan="4"><inputtype="text"id="nummessege"></td>    </tr>    </thead>    <tbody>    <tr>        <td><inputtype="button"value="7"onclick="onclicknum(7)"></td>        <td><inputtype="button"value="8"onclick="onclicknum(8)"></td>        <td><inputtype="button"value="9"onclick="onclicknum(9)"></td>        <td><inputtype="button"value="+"onclick="onclicknum('+')"></td>    </tr>    <tr>        <td><inputtype="button"value="4"onclick="onclicknum(4)"></td>        <td><inputtype="button"value="5"onclick="onclicknum(5)"></td>        <td><inputtype="button"value="6"onclick="onclicknum(6)"></td>        <td><inputtype="button"value="-"onclick="onclicknum('-')"></td>    </tr>    <tr>        <td><inputtype="button"value="1"onclick="onclicknum(1)"></td>        <td><inputtype="button"value="2"onclick="onclicknum(2)"></td>        <td><inputtype="button"value="3"onclick="onclicknum(3)"></td>        <td><inputtype="button"value="*"onclick="onclicknum('*')"></td>    </tr>    <tr>        <tdcolspan="2"><inputtype="button"value="0"onclick="onclicknum(0)"></td>        <td><inputtype="button"value="."onclick="onclicknum('.')"></td>        <td><inputtype="button"value="/"onclick="onclicknum('/')"></td>    </tr>    </tbody>    <tfoot>    <tr>        <tdcolspan="2"><inputtype="button"value="Del"onclick="onclickclear()"></td>        <tdcolspan="2"><inputtype="button"value="="onclick="onclickresult()"></td>    </tr>    </tfoot></table></body></html>

如何运行?

运行这个计算器非常简单,不需要任何开发环境:

1.新建一个文本文件,将上面的完整代码粘贴进去

2.保存为 calculator.html(注意后缀名必须是 .html

3.双击这个文件,浏览器会自动打开并运行

小贴士

如果你用的是 VS Code,可以安装 Live Server 插件,实现代码修改后浏览器自动刷新,开发体验更佳。

◆ 原理解析:它是怎么工作的?

让我们用一个具体例子来说明。假设你要计算 12 + 8 

4.点击 "1" → 显示屏变为 "1"

5.点击 "2" → 显示屏变为 "12"

6.点击 "+" → 显示屏变为 "12+"

7.点击 "8" → 显示屏变为 "12+8"

8.点击 "=" → eval("12+8") 计算结果为 20,显示屏显示 "20"

核心思路就是:每次点击按钮,把对应的字符拼接到显示屏的字符串后面。点击等号时,把整个字符串当作数学表达式执行计算。

◆ 进阶挑战

如果你已经把上面的代码跑起来了,可以尝试以下改进,加深理解:

难度

改进方向

提示

添加退格功能

 str.value.slice(0, -1) 删除最后一个字符

★★

美化界面

学习 CSS 的 border-radiusbox-shadowgradient

★★

键盘支持

监听 keydown 事件,实现键盘输入

★★★

替换 eval()

用正则表达式或自己写解析器替代

★★★

历史记录

用数组保存计算历史,支持上下翻查

这个计算器项目虽然简单,但它涵盖了前端开发最核心的三个知识点:

HTML 负责页面结构(显示什么)

CSS 负责页面样式(怎么显示)

JavaScript 负责页面逻辑(怎么交互)

如果你是前端新手,强烈建议亲手把代码敌一遍,而不是直接复制粘贴。每效一行代码,想想它的作用是什么,这比看任何教程都有用。

觉得有用就转发给正在学前端的朋友吧!

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  1. CONNECT:[ UseTime:0.000396s ] mysql:host=127.0.0.1;port=3306;dbname=g_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000528s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.065937s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004709s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000707s ]
  6. SELECT * FROM `set` [ RunTime:0.004314s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000666s ]
  8. SELECT * FROM `article` WHERE `id` = 458507 LIMIT 1 [ RunTime:0.026039s ]
  9. UPDATE `article` SET `lasttime` = 1778592004 WHERE `id` = 458507 [ RunTime:0.000826s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000540s ]
  11. SELECT * FROM `article` WHERE `id` < 458507 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007044s ]
  12. SELECT * FROM `article` WHERE `id` > 458507 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002689s ]
  13. SELECT * FROM `article` WHERE `id` < 458507 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015286s ]
  14. SELECT * FROM `article` WHERE `id` < 458507 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.017462s ]
  15. SELECT * FROM `article` WHERE `id` < 458507 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013305s ]
0.232052s