


Detailed explanation of how to multiply and divide two numbers through javascript
In the previous article "Calculate the volume of a cylinder through javascript and keep 4 decimal places", I introduced how to calculate the volume of a cylinder through javascript. Interested friends can also learn about it. ~
The Chinese topic of this article is "Writing a JavaScript program to calculate the product and quotient of two numbers (from user input)".
If we need to calculate multiplication and division based on two numbers entered by the user, then we must start by creating a form.
I will give you the complete implementation code directly below:
<!DOCTYPE html> <html> <head> <meta charset=utf-8 /> <title></title> <style type="text/css"> body {margin: 30px;} </style> </head> <body> <form> 第一个数 : <input type="text" id="firstNumber" /><br> 第二个数: <input type="text" id="secondNumber" /><br> <input type="button" onClick="multiplyBy()" Value="相乘" /> <input type="button" onClick="divideBy()" Value="相除" /> </form> <p>计算结果是: <br> <span id = "result"></span> </p> <script> function multiplyBy() { num1 = document.getElementById("firstNumber").value; num2 = document.getElementById("secondNumber").value; document.getElementById("result").innerHTML = num1 * num2; } function divideBy() { num1 = document.getElementById("firstNumber").value; num2 = document.getElementById("secondNumber").value; document.getElementById("result").innerHTML = num1 / num2; } </script> </body> </html>
View the effect through the browser as follows:
Then let’s do whatever we want Enter two numbers to see the results of multiplication and division:
Nothing wrong! Completely correct!
In the above code:
document.getElementById(id).value
: The value attribute sets or returns the value of the value attribute of the text field.
document.getElementById("result").innerHTM
: The innerHTML attribute sets or returns the HTML content of the element (inner HTML).
→Note: HTML DOM defines multiple methods for finding elements. In addition to getElementById(), there are also getElementsByName() and getElementsByTagName(); however, if you need to find a specific element in the document, For elements, the most efficient method is getElementById(). When working with a specific element of a document, it's a good idea to give that element an id attribute, giving it a unique name (within the document) and then using that ID to find the desired element.
There are also key calculation formulas for multiplication and division "num1 * num2
" and "num1 / num2
".
Finally, I would like to recommend "JavaScript Basics Tutorial" ~ Welcome everyone to learn ~
The above is the detailed content of Detailed explanation of how to multiply and divide two numbers through javascript. For more information, please follow other related articles on the PHP Chinese website!

Node.js excels at efficient I/O, largely thanks to streams. Streams process data incrementally, avoiding memory overload—ideal for large files, network tasks, and real-time applications. Combining streams with TypeScript's type safety creates a powe

The differences in performance and efficiency between Python and JavaScript are mainly reflected in: 1) As an interpreted language, Python runs slowly but has high development efficiency and is suitable for rapid prototype development; 2) JavaScript is limited to single thread in the browser, but multi-threading and asynchronous I/O can be used to improve performance in Node.js, and both have advantages in actual projects.

JavaScript originated in 1995 and was created by Brandon Ike, and realized the language into C. 1.C language provides high performance and system-level programming capabilities for JavaScript. 2. JavaScript's memory management and performance optimization rely on C language. 3. The cross-platform feature of C language helps JavaScript run efficiently on different operating systems.

JavaScript runs in browsers and Node.js environments and relies on the JavaScript engine to parse and execute code. 1) Generate abstract syntax tree (AST) in the parsing stage; 2) convert AST into bytecode or machine code in the compilation stage; 3) execute the compiled code in the execution stage.

The future trends of Python and JavaScript include: 1. Python will consolidate its position in the fields of scientific computing and AI, 2. JavaScript will promote the development of web technology, 3. Cross-platform development will become a hot topic, and 4. Performance optimization will be the focus. Both will continue to expand application scenarios in their respective fields and make more breakthroughs in performance.

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.


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

Dreamweaver CS6
Visual web development tools

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

Atom editor mac version download
The most popular open source editor

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
