二進位計算器是一種對二進制數進行數學計算的程式。現在，您還記得二進制數是僅由兩個數字（即 0 和 1）組成的數字。在本部落格中，我們將使用此程序來計算二進制數的加法、減法、乘法和除法。這將是一個基本的計算器，將使用 HTML、CSS 和 JavaScript 的基本概念來執行相同的操作。那麼，讓我們開始了解 HTML 結構。
首先，我們將製作一個表格，該表格將分為表格行，提供諸如加1，加0，清除加，減，乘和除號等號的顯示和按鈕等功能。
<form>
<table>
<tr>
<td colspan="4">
<input type="text" id="display" disabled />
</td>
</tr>
<tr>
<td>
<input type="button" value="1" onclick="addToDisplay(1)" />
</td>
<td>
<input type="button" value="0" onclick="addToDisplay(0)" />
</td>
<td>
<input type="button" value="C" onclick="clearDisplay()" />
</td>
<td>
<input type="button" value="+" onclick="addToDisplay('+')" />
</td>
<td>
<input type="button" value="-" onclick="addToDisplay('-')" />
</td>
<td>
<input type="button" value="*" onclick="addToDisplay('*')" />
</td>
<td>
<input type="button" value="/" onclick="addToDisplay('/')" />
</td>
<td>
<input type="button" value="=" onclick="calculate()" />
</td>
</tr>
<tr>
<td colspan="4">
Equivalent Decimal is:
<p id="toDecimal"></p>
</td>
</tr>
<tr>
<td colspan="4">
<p id="previousCalculation"></p>
</td>
</tr>
<!-- more buttons for the other operations -->
</table>
</form>
如您所見，我們有一個 ID 為「display」的輸入欄位已被停用。此欄位將用於顯示輸入和計算結果。我們還有一組用於不同二進位數字（0 和 1）和不同數學運算（ 、-、*、/）的按鈕。每個按鈕都有一個 onclick 屬性，點擊時會觸發 JavaScript 函數。
接下來，我們將添加一些 CSS 樣式以使我們的計算器看起來更美觀。
<style>
/* Center the calculator on the page */
table {
margin: 0 auto;
padding: 20px;
}
/* Style the display */
#display {
background-color: #f2f2f2; /* gray */
text-align: right;
padding: 12px 20px;
font-size: 20px;
border: none;
width: 100%;
}
/* Add some spacing between the buttons */
input[type="button"] {
margin: 5px;
}
/* Give the buttons a consistent size and appearance */
input[type="button"] {
width: 50px;
height: 50px;
font-size: 18px;
background-color: #f2f2f2;
border: none;
cursor: pointer;
}
#toDecimal {
font-size: 30px;
}
/* Add hover effect to the buttons */
input[type="button"]:hover {
background-color: #e6e6e6;
}
/* Add a different style for the operator buttons */
input[type="button"][value="+"],
input[type="button"][value="-"],
input[type="button"][value="*"],
input[type="button"][value="/"] {
background-color: #4caf50;
color: white;
}
/* Add a different style for the clear button */
input[type="button"][value="C"] {
background-color: #f44336;
color: white;
}
/* Add a different style for the equal button */
input[type="button"][value="="] {
background-color: #2196f3;
color: white;
}
</style>
最後，我們將在計算機上新增 JavaScript 功能。
<script>
function addToDisplay(val) {
var display = document.getElementById("display");
display.value += val;
}
function clearDisplay() {
var display = document.getElementById("display");
display.value = "";
document.getElementById("toDecimal").innerHTML = "";
}
function calculate() {
var display = document.getElementById("display");
var result = eval(display.value);
display.value = result;
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
}
function calculate() {
var display = document.getElementById("display");
var input = display.value;
var result;
//splitting the input by operator
var numbers = input.split(/[+\-*/]/);
var operator = input.replace(numbers[0], "").replace(numbers[1], "");
//converting strings to binary
var num1 = parseInt(numbers[0], 2);
var num2 = parseInt(numbers[1], 2);
//checking the operator and performing the corresponding operation
switch (operator) {
case "+":
result = (num1 + num2).toString(2);
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
break;
case "-":
result = (num1 - num2).toString(2);
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
break;
case "*":
result = (num1 * num2).toString(2);
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
break;
case "/":
result = (num1 / num2).toString(2);
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
break;
default:
result = "Invalid operator";
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
}
display.value = result;
}
</script>
<!DOCTYPE html>
<html>
<head>
<title>Calculator</title>
<style>
/* Center the calculator on the page */
table {
margin: 0 auto;
padding: 20px;
}
/* Style the display */
#display {
background-color: #f2f2f2; /* gray */
text-align: right;
padding: 12px 20px;
font-size: 20px;
border: none;
width: 100%;
}
/* Add some spacing between the buttons */
input[type="button"] {
margin: 5px;
}
/* Give the buttons a consistent size and appearance */
input[type="button"] {
width: 50px;
height: 50px;
font-size: 18px;
background-color: #f2f2f2;
border: none;
cursor: pointer;
}
#toDecimal {
font-size: 30px;
}
/* Add hover effect to the buttons */
input[type="button"]:hover {
background-color: #e6e6e6;
}
/* Add a different style for the operator buttons */
input[type="button"][value="+"],
input[type="button"][value="-"],
input[type="button"][value="*"],
input[type="button"][value="/"] {
background-color: #4caf50;
color: white;
}
/* Add a different style for the clear button */
input[type="button"][value="C"] {
background-color: #f44336;
color: white;
}
/* Add a different style for the equal button */
input[type="button"][value="="] {
background-color: #2196f3;
color: white;
}
</style>
</head>
<body>
<form>
<table>
<tr>
<td colspan="4">
<input type="text" id="display" disabled />
</td>
</tr>
<tr>
<td>
<input type="button" value="1" onclick="addToDisplay(1)" />
</td>
<td>
<input type="button" value="0" onclick="addToDisplay(0)" />
</td>
<td>
<input type="button" value="C" onclick="clearDisplay()" />
</td>
<td>
<input type="button" value="+" onclick="addToDisplay('+')" />
</td>
<td>
<input type="button" value="-" onclick="addToDisplay('-')" />
</td>
<td>
<input type="button" value="*" onclick="addToDisplay('*')" />
</td>
<td>
<input type="button" value="/" onclick="addToDisplay('/')" />
</td>
<td>
<input type="button" value="=" onclick="calculate()" />
</td>
</tr>
<tr>
<td colspan="4">
Equivalent Decimal is:
<p id="toDecimal"></p>
</td>
</tr>
<tr>
<td colspan="4">
<p id="previousCalculation"></p>
</td>
</tr>
<!-- more buttons for the other operations -->
</table>
</form>
<script>
function addToDisplay(val) {
var display = document.getElementById("display");
display.value += val;
}
function clearDisplay() {
var display = document.getElementById("display");
display.value = "";
document.getElementById("toDecimal").innerHTML = "";
}
function calculate() {
var display = document.getElementById("display");
var result = eval(display.value);
display.value = result;
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
}
function calculate() {
var display = document.getElementById("display");
var input = display.value;
var result;
//splitting the input by operator
var numbers = input.split(/[+\-*/]/);
var operator = input.replace(numbers[0], "").replace(numbers[1], "");
//converting strings to binary
var num1 = parseInt(numbers[0], 2);
var num2 = parseInt(numbers[1], 2);
//checking the operator and performing the corresponding operation
switch (operator) {
case "+":
result = (num1 + num2).toString(2);
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
break;
case "-":
result = (num1 - num2).toString(2);
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
break;
case "*":
result = (num1 * num2).toString(2);
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
break;
case "/":
result = (num1 / num2).toString(2);
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
break;
default:
result = "Invalid operator";
var decimalNumber = parseInt(result, 2);
document.getElementById("toDecimal").innerHTML = decimalNumber;
}
display.value = result;
localStorage.setItem("previousCalculation", input + " = " + result);
var previousCalculation = localStorage.getItem("previousCalculation");
document.getElementById("previousCalculation").innerHTML = previousCalculation;
}
</script>
</body>
</html>
在本教學中，我們學習如何使用 HTML、CSS 和 JavaScript 建立二進位計算器。我們已經了解如何設定 HTML 結構、新增 CSS 樣式和 JavaScript 功能來建立一個可用的計算器。您可以新增更多功能，例如處理錯誤情況並根據您的要求添加更多操作。此專案可以幫助您了解不同語言如何協同工作來建立動態的互動式 Web 應用程式。
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