search

Home  >  Article  >  Web Front-end  >  Implementing a simple calculator with pure js code_javascript skills

Implementing a simple calculator with pure js code_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:28:201275browse

This article shares an example of implementing a simple calculator code with pure js code. I believe everyone will like it. The details are as follows:
The screenshot of the running effect is as follows:

The specific code is as follows: 

<!DOCTYPE html>
<html>
 <head>
 <title> new document </title> 
 <script type="text/javascript">
  function count(){
    var txt1  = parseInt( document.getElementById('txt1').value);//获取第一个输入框的值
    var txt2  = parseInt( document.getElementById('txt2').value);//获取第二个输入框的值
    var select = document.getElementById('select').value;//获取选择框的值
    var result = '';
    switch (select)
     {
      case '+':
        result = txt1 + txt2;
        break;
      case '-':
        result = txt1 - txt2;
        break;
      case '*':
        result = txt1 * txt2;
        break;
      case '/':
        result = txt1 / txt2;
        break; 
     }
     document.getElementById('fruit').value = result;//设置结果输入框的值 
  }
 </script> 
 </head> 
 <body>
  <input type='text' id='txt1' /> 
  <select id='select'>
    <option value='+'>+</option>
    <option value="-">-</option>
    <option value="*">*</option>
    <option value="/">/</option>
  </select>
  <input type='text' id='txt2' /> 
  <input type='button' value=' = ' onclick = "count()" /> <!--通过 = 按钮来调用创建的函数，得到结果--> 
  <input type='text' id='fruit' />  
 </body>
</html>

Copy and paste the code above to implement a simple calculator function. I hope this article will be helpful for everyone to learn javascript programming.

Statement：
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
Previous article：jquery tips for daily collection_jqueryNext article：jquery tips for daily collection_jquery

Related articles

See more