Writing conversion temperature in javascript
In daily life, we often need to convert Celsius to Fahrenheit. This functionality can be easily achieved by writing code using JavaScript. In this article, we'll explore how to write a simple temperature conversion program using JavaScript.
Step 1: HTML page
First, we need to create an HTML page so that users can perform conversions by entering temperature values. The following is the HTML code:
<!DOCTYPE html>
<html>
<head>
<title>温度转换器</title>
</head>
<body>
<h1>温度转换器</h1>
<form>
<label>输入要转换的温度：</label>
<input type="text" id="temperature">
<br><br>
<input type="radio" name="converter" value="celsius">摄氏度转华氏度
<input type="radio" name="converter" value="fahrenheit">华氏度转摄氏度
<br><br>
<input type="button" value="转换" onclick="convertTemperature()">
</form>
<br>
<p id="result"></p>
</body>
</html>The above code includes: a title and a form, including an input box, a radio button and a "Convert" button. We've also added a paragraph below the page to display the converted results.
Step 2: JavaScript function
Next, we need to write a JavaScript function to perform temperature conversion when the user clicks the "Convert" button. The following is the JavaScript code:
function convertTemperature() {
var input = document.getElementById("temperature");
var temperature = input.value;
var radio = document.getElementsByName("converter");
var result = document.getElementById("result");
if (radio[0].checked) {
var fahrenheit = (temperature * 9 / 5) + 32;
result.innerHTML = temperature + " 摄氏度 = " + fahrenheit + " 华氏度";
} else {
var celsius = (temperature - 32) * 5 / 9;
result.innerHTML = temperature + " 华氏度 = " + celsius + " 摄氏度";
}
}The above code uses the getElementById, getElementsByName and innerHTML functions to obtain the temperature value entered by the user, obtain the conversion type selected by the user and display the conversion result.
If the user selects "Celsius to Fahrenheit", the program will replace the data type Number type and assign it to the variable temperature, then multiply the input value by 9/5 and add 32 to calculate the corresponding Fahrenheit, and finally output the conversion result.
On the contrary, if the user selects "Fahrenheit to Celsius", the program will also replace the data type Number with the value and assign it to the variable temperature, then subtract 32 from it and multiply it by 5/9 to calculate Output the corresponding degrees Celsius and also output the conversion result.
Step 3: Run the program
Finally, run the program in your browser and you should see a simple temperature converter, easily convert to degrees Celsius after viewing the temperature conversion results Fahrenheit or Fahrenheit to Celsius. Ensure that the JavaScript code is correct and follows the Document Object Model (DOM) to obtain and process temperature values, conversion types, and output results.
Summary:
Through the above simple steps, we can write a very practical JavaScript temperature converter. Although this program is simple, it is highly extensible and can implement more functions to meet your different needs, such as adding unit selections, supporting more temperature regimes, etc. This also illustrates the powerful utility of JavaScript as a general-purpose scripting language.
The above is the detailed content of Writing conversion temperature in javascript. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
React's Role in HTML: Enhancing User Experience
Apr 09, 2025 am 12:11 AM
React combines JSX and HTML to improve user experience. 1) JSX embeds HTML to make development more intuitive. 2) The virtual DOM mechanism optimizes performance and reduces DOM operations. 3) Component-based management UI to improve maintainability. 4) State management and event processing enhance interactivity.
React and the Frontend: Building Interactive Experiences
Apr 11, 2025 am 12:02 AM
React is the preferred tool for building interactive front-end experiences. 1) React simplifies UI development through componentization and virtual DOM. 2) Components are divided into function components and class components. Function components are simpler and class components provide more life cycle methods. 3) The working principle of React relies on virtual DOM and reconciliation algorithm to improve performance. 4) State management uses useState or this.state, and life cycle methods such as componentDidMount are used for specific logic. 5) Basic usage includes creating components and managing state, and advanced usage involves custom hooks and performance optimization. 6) Common errors include improper status updates and performance issues, debugging skills include using ReactDevTools and Excellent
React Components: Creating Reusable Elements in HTML
Apr 08, 2025 pm 05:53 PM
React components can be defined by functions or classes, encapsulating UI logic and accepting input data through props. 1) Define components: Use functions or classes to return React elements. 2) Rendering component: React calls render method or executes function component. 3) Multiplexing components: pass data through props to build a complex UI. The lifecycle approach of components allows logic to be executed at different stages, improving development efficiency and code maintainability.
Frontend Development with React: Advantages and Techniques
Apr 17, 2025 am 12:25 AM
The advantages of React are its flexibility and efficiency, which are reflected in: 1) Component-based design improves code reusability; 2) Virtual DOM technology optimizes performance, especially when handling large amounts of data updates; 3) The rich ecosystem provides a large number of third-party libraries and tools. By understanding how React works and uses examples, you can master its core concepts and best practices to build an efficient, maintainable user interface.
React's Ecosystem: Libraries, Tools, and Best Practices
Apr 18, 2025 am 12:23 AM
The React ecosystem includes state management libraries (such as Redux), routing libraries (such as ReactRouter), UI component libraries (such as Material-UI), testing tools (such as Jest), and building tools (such as Webpack). These tools work together to help developers develop and maintain applications efficiently, improve code quality and development efficiency.
React vs. Backend Frameworks: A Comparison
Apr 13, 2025 am 12:06 AM
React is a front-end framework for building user interfaces; a back-end framework is used to build server-side applications. React provides componentized and efficient UI updates, and the backend framework provides a complete backend service solution. When choosing a technology stack, project requirements, team skills, and scalability should be considered.
React and the Frontend Stack: The Tools and Technologies
Apr 10, 2025 am 09:34 AM
React is a JavaScript library for building user interfaces, with its core components and state management. 1) Simplify UI development through componentization and state management. 2) The working principle includes reconciliation and rendering, and optimization can be implemented through React.memo and useMemo. 3) The basic usage is to create and render components, and the advanced usage includes using Hooks and ContextAPI. 4) Common errors such as improper status update, you can use ReactDevTools to debug. 5) Performance optimization includes using React.memo, virtualization lists and CodeSplitting, and keeping code readable and maintainable is best practice.
The Future of React: Trends and Innovations in Web Development
Apr 19, 2025 am 12:22 AM
React's future will focus on the ultimate in component development, performance optimization and deep integration with other technology stacks. 1) React will further simplify the creation and management of components and promote the ultimate in component development. 2) Performance optimization will become the focus, especially in large applications. 3) React will be deeply integrated with technologies such as GraphQL and TypeScript to improve the development experience.
