Sum of two numbers in JavaScript

In this tutorial we will discover how to calculate the sum of two numbers entered by the user in Javascript.

Program to calculate the sum of two numbers in JavaScript
<!doctype html>
         function sumOfNbr(){
             var nbr1, nbr2, sum;
             nbr1 = Number(document.getElementById("nbr1").value);
             nbr2 = Number(document.getElementById("nbr2").value);
             sum = nbr1 + nbr2;
             document.getElementById("sum").value = sum;
      <input id="nbr1"> + <input id="nbr2">
      <button onclick="sumOfNbr()">Calculate the sum</button>
      = <input id="sum">
+ =
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