[Javascript] How to sum of all its digits for a number

Given a number x, find sum of digits in that number.
Examples:

1. Input n = 8
Output - Sum of digits in number is 8

2. Input n = 1234
Output - Sum of digits in number is 10

3. Input n = - 8
Output - Sum of digits in number is -8

4. Input n = -1234
Output - Sum of digits in number is 8

Step 1: we have to create a demo.html


Step 2: we write the function in javascript to sum of all digits in a number. With 2 ways to declare the function.

The first one: using var num = parseInt(document.getElementById("demo").value); when everything is done, we got the sum. We will use document.getElementById("result").innerHTML = sum to show on web browser.

The second one: using var textType = Node.textContent ? 'textContent' : 'innerText'; Is is the textContent or innerText? You also do something like the first one, but when you get the value for <p> tag. Just using like this result1[textType] = sum;

Let's do it now

[Javascript] How to sum of all its digits for a number