Js implements simple calculator Functions

This article mainly shares the sample code for js to implement the simple calculator function. It has a certain reference value. Let's take a look at the sample code below:

  
   Simple Calculator  
  
    
  
  
    
 
 
      
  
  
 
   
 
    
7
 
    
8
 
    
9
 
    
*
 
   
 
   
 
    
4
 
    
5
 
    
6
 
    
/
 
   
 
   
 
    
1
 
    
2
 
    
3
 
    
+
 
   
 
   
 
    
DEL
 
    
0
 
    
=
 
    
-
 
   
 
  
 
 
  
Script var numString = document. getElementsByClassName ("string") [0]; var buttonGroup = document. getElementsByTagName ("a"); var screen = document. getElementsByClassName ("string") [0]; var num1 = 0; var num2 = 0; var count = 0; var f; var flag = true; /* control the input number */var flag2 = true;/* control whether to continuously click the symbol */screen. onclick = function () {numString. innerHTML = "" ;}; for (var I = 0; I <buttonGroup. length; I ++) {ButtonGroup [I]. onclick = function () {switch (this. innerHTML) {case "0": case "1": case "2": case "3": case "4": case "5": case "6 ": case "7": case "8": case "9": if (! Flag) {numString. innerHTML = ""; flag2 = true;} flag = true; numString. innerHTML + = this. innerHTML; break; case "DEL": numString. innerHTML = numString. innerHTML. substr (0, numString. innerHTML. length-1); break; case "+": case "-": case "*": case "/": f = this. innerHTML; count ++; if (flag2) {flag = false;/* indicates the input symbol */if (count = 1) {num1 = numString. innerHTML;} else {flag2 = false; num2 = nu MString. innerHTML; numString. innerHTML = eval (num1 + f + num2); num1 = numString. innerHTML ;}} break; case "=": num2 = numString. innerHTML; numString. innerHTML = eval (num1 + f + num2); count = 0; flag =! Flag; break ;}} script

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