how to change the text in js code example

Example 1: change text of element js

document.getElementById("p1").innerHTML = "New text!";

Example 2: change the text of inputfield unity

using UnityEngine.UI;

public InputField example; //creates an inputfield with the name "example"
public string textToPutToInputField = "If I helped you don't forget to upvote!"; //creates a string to give its value to the inputfield

public void SetTheText() //creates a void that we can call in one of our main void
{
example.text = textToPutToInputField; //gives the value of our string to the text of the inputfield
}

//Now, it's written "If I helped you don't forget to upvote!" on the inputfield

Example 3: change the border of an image js

<input id="imageId" type="image" src="http://goo.gl/UohAz" onclick="mark(this)"/>

function mark(el) {
    el.style.border = "1px solid blue";
}