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纯js代码实现简单计算器_javascript技巧

WBOY
Release: 2016-05-16 15:28:20
Original
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本文实例分享了纯js代码实现简单计算器代码,相信大家会喜欢。具体如下:
运行效果截图如下:

具体代码如下:

<!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>
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复制粘贴上方代码即可实现简单的计算器功能,希望本文所述对大家学习javascript程序设计有所帮助。

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