clearResult<\/code> functions in a JavaScript file. The following is a sample code: <\/p>function buttonClick(value) {\n var result = document.getElementById(\"result\");\n\n if (value === '=') {\n result.value = eval(result.value); \/\/ 使用 eval 函數(shù)計(jì)算表達(dá)式\n } else {\n result.value += value;\n }\n}\n\nfunction clearResult() {\n document.getElementById(\"result\").value = \"\";\n}<\/pre>In the buttonClick<\/code> function, we first obtain the reference to the text box through the getElementById<\/code> method, and then perform different processing based on the value of the button . If the button's value is the equal sign (=), we will use the eval<\/code> function to evaluate the expression and display the result in the text box. Otherwise, we append the button's value to the text box's content. <\/p>\nclearResult<\/code> The function simply sets the value of the text box to an empty string, realizing the clearing function. <\/p>\nNow, you can save the above HTML code and JavaScript code to the corresponding files and open the HTML file in the browser. You'll see a simple calculator interface that allows you to perform basic mathematical operations. <\/p>\n
This is just a simple calculator example, which only implements the basic four arithmetic functions. If you want to implement more complex calculator functions, such as supporting brackets, trigonometric functions, etc., you need to further improve the code. But with this example, you can see how to use JavaScript to implement a simple calculator function. <\/p>\n
I hope this article can help you, and I wish you happy programming! <\/p>"}
Home
Web Front-end
JS Tutorial
How to implement a simple calculator function using JavaScript?
How to implement a simple calculator function using JavaScript?
Oct 27, 2023 pm 02:51 PM
javascript
calculator
accomplish
How to use JavaScript to implement a simple calculator function?
The calculator is one of the commonly used tools in our daily life. It can be used to perform simple mathematical operations. Today, we will implement a simple calculator function using JavaScript. In this article, I'll show you how to write code using JavaScript to implement basic math operations and a calculator interface.
First, we need to create an HTML file that contains a text box, number buttons, and operator buttons for displaying the results of the operation. The following is the basic HTML structure:
<!DOCTYPE html>
<html>
<head>
<title>簡單計(jì)算器</title>
<style>
/* 樣式可以根據(jù)個(gè)人喜好進(jìn)行自定義 */
</style>
</head>
<body>
<input type="text" id="result" readonly>
<br>
<button onclick="buttonClick('1')">1</button>
<button onclick="buttonClick('2')">2</button>
<button onclick="buttonClick('3')">3</button>
<button onclick="buttonClick('+')">+</button>
<br>
<button onclick="buttonClick('4')">4</button>
<button onclick="buttonClick('5')">5</button>
<button onclick="buttonClick('6')">6</button>
<button onclick="buttonClick('-')">-</button>
<br>
<button onclick="buttonClick('7')">7</button>
<button onclick="buttonClick('8')">8</button>
<button onclick="buttonClick('9')">9</button>
<button onclick="buttonClick('*')">*</button>
<br>
<button onclick="buttonClick('0')">0</button>
<button onclick="buttonClick('.')">.</button>
<button onclick="buttonClick('=')">=</button>
<button onclick="buttonClick('/')">/</button>
<br>
<button onclick="clearResult()">清空</button>
</body>
</html>In the above HTML code, we use a text box (id is "result") to display the result of the operation, and add number buttons, operator buttons and clear button. Each button has an onclick event, which calls a JavaScript function named buttonClick to handle button click events.
Next, we need to write the implementation of the buttonClick and clearResult functions in a JavaScript file. The following is a sample code:
function buttonClick(value) {
var result = document.getElementById("result");
if (value === '=') {
result.value = eval(result.value); // 使用 eval 函數(shù)計(jì)算表達(dá)式
} else {
result.value += value;
}
}
function clearResult() {
document.getElementById("result").value = "";
}In the buttonClick function, we first obtain the reference to the text box through the getElementById method, and then perform different processing based on the value of the button . If the button's value is the equal sign (=), we will use the eval function to evaluate the expression and display the result in the text box. Otherwise, we append the button's value to the text box's content.
clearResult The function simply sets the value of the text box to an empty string, realizing the clearing function.
Now, you can save the above HTML code and JavaScript code to the corresponding files and open the HTML file in the browser. You'll see a simple calculator interface that allows you to perform basic mathematical operations.
This is just a simple calculator example, which only implements the basic four arithmetic functions. If you want to implement more complex calculator functions, such as supporting brackets, trigonometric functions, etc., you need to further improve the code. But with this example, you can see how to use JavaScript to implement a simple calculator function.
I hope this article can help you, and I wish you happy programming!
The above is the detailed content of How to implement a simple calculator function using JavaScript?. For more information, please follow other related articles on the PHP Chinese website!
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How to implement dual WeChat login on Huawei mobile phones?
Mar 24, 2024 am 11:27 AM
How to implement dual WeChat login on Huawei mobile phones? With the rise of social media, WeChat has become one of the indispensable communication tools in people's daily lives. However, many people may encounter a problem: logging into multiple WeChat accounts at the same time on the same mobile phone. For Huawei mobile phone users, it is not difficult to achieve dual WeChat login. This article will introduce how to achieve dual WeChat login on Huawei mobile phones. First of all, the EMUI system that comes with Huawei mobile phones provides a very convenient function - dual application opening. Through the application dual opening function, users can simultaneously
PHP Programming Guide: Methods to Implement Fibonacci Sequence
Mar 20, 2024 pm 04:54 PM
The programming language PHP is a powerful tool for web development, capable of supporting a variety of different programming logics and algorithms. Among them, implementing the Fibonacci sequence is a common and classic programming problem. In this article, we will introduce how to use the PHP programming language to implement the Fibonacci sequence, and attach specific code examples. The Fibonacci sequence is a mathematical sequence defined as follows: the first and second elements of the sequence are 1, and starting from the third element, the value of each element is equal to the sum of the previous two elements. The first few elements of the sequence
PHP Game Requirements Implementation Guide
Mar 11, 2024 am 08:45 AM
PHP Game Requirements Implementation Guide With the popularity and development of the Internet, the web game market is becoming more and more popular. Many developers hope to use the PHP language to develop their own web games, and implementing game requirements is a key step. This article will introduce how to use PHP language to implement common game requirements and provide specific code examples. 1. Create game characters In web games, game characters are a very important element. We need to define the attributes of the game character, such as name, level, experience value, etc., and provide methods to operate these
An efficient Fibonacci sequence calculator written in PHP
Mar 21, 2024 am 10:06 AM
Efficient Fibonacci sequence calculator: PHP implementation of Fibonacci sequence is a very classic mathematical problem. The rule is that each number is equal to the sum of the previous two numbers, that is, F(n)=F(n -1)+F(n-2), where F(0)=0 and F(1)=1. When calculating the Fibonacci sequence, it can be implemented recursively, but performance problems will occur as the value increases. Therefore, this article will introduce how to write an efficient Fibonacci using PHP
How to implement the WeChat clone function on Huawei mobile phones
Mar 24, 2024 pm 06:03 PM
How to implement the WeChat clone function on Huawei mobile phones With the popularity of social software and people's increasing emphasis on privacy and security, the WeChat clone function has gradually become the focus of people's attention. The WeChat clone function can help users log in to multiple WeChat accounts on the same mobile phone at the same time, making it easier to manage and use. It is not difficult to implement the WeChat clone function on Huawei mobile phones. You only need to follow the following steps. Step 1: Make sure that the mobile phone system version and WeChat version meet the requirements. First, make sure that your Huawei mobile phone system version has been updated to the latest version, as well as the WeChat App.
Master how Golang enables game development possibilities
Mar 16, 2024 pm 12:57 PM
In today's software development field, Golang (Go language), as an efficient, concise and highly concurrency programming language, is increasingly favored by developers. Its rich standard library and efficient concurrency features make it a high-profile choice in the field of game development. This article will explore how to use Golang for game development and demonstrate its powerful possibilities through specific code examples. 1. Golang’s advantages in game development. As a statically typed language, Golang is used in building large-scale game systems.
How to implement exact division operation in Golang
Feb 20, 2024 pm 10:51 PM
Implementing exact division operations in Golang is a common need, especially in scenarios involving financial calculations or other scenarios that require high-precision calculations. Golang's built-in division operator "/" is calculated for floating point numbers, and sometimes there is a problem of precision loss. In order to solve this problem, we can use third-party libraries or custom functions to implement exact division operations. A common approach is to use the Rat type from the math/big package, which provides a representation of fractions and can be used to implement exact division operations.
How to convert currency on Mac system calculator - How to convert currency on Mac system calculator
Mar 18, 2024 pm 03:58 PM
Friends, do you know how to convert currency on Mac system calculator? Today I will explain how to convert currency on Mac system calculator. If you are interested, please come and take a look with me. I hope it can help you. Step 1: Open the Mac system calculator, click Convert on the menu bar. Step 2: In the Conversion menu, click Currency. Step 3: After selecting the currency to convert, click the Convert button.
See all articles
|
|