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How to Use JavaScript to Create a Simple Calculator
2023-06-15 20:13:59 深夜i     --     --
JavaScript

How to Use JavaScript to Create a Simple Calculator

JavaScript is a powerful programming language that can be used to create all sorts of interactive web applications, including calculators. In this article, we will walk you through the steps of creating a simple calculator using JavaScript.

To start, we need to create a basic HTML layout for our calculator. Here's the code:



 


   
 JavaScript Calculator


 


 


  



 
   

 
  




  



 
   

 
   

 
   

 
   

 
  




  



 
   

 
   

 
   

 
   

 
  




  



 
   

 
   

 
   

 
   

 
  




  



 
   

 
   

 
   

 
   

 
  




  



 
   

 
  




   
 


 

This HTML code creates the basic structure of our calculator and includes a JavaScript file called "calculator.js". Let's write the JavaScript code for our calculator now:



var result = document.getElementById('result');


function calculate(value) {


 result.value += value;


}


function clearResult()


 result.value = '';


function getResult() {


 result.value = eval(result.value);


}

This JavaScript code creates three functions - "calculate", "clearResult", and "getResult". The "calculate" function accepts a value (either a number or an operator) and adds it to the calculator's display. The "clearResult" function clears the calculator's display. Finally, the "getResult" function evaluates the mathematical expression entered in the calculator's display and displays the result.

We're now ready to test our calculator! Open the HTML file in a web browser and start entering numbers and operators. Press the "=" to get the result.

In summary, we've learned how to use JavaScript to create a simple calculator. With this knowledge, you can go on to create more sophisticated calculator applications that can handle complex mathematical expressions.

calculator, HTML, functions, eval.

  
  

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