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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.