how to set image src by js code example

Example 1: change image src jquery

$(document).ready(function () {
    $('img').click(function(){
        $(this).attr('src','images/download.jpeg')
      })
})

Example 2: javascript set image src

// Pure JavaScript to Create img tag and add attributes manually ,
var image = document.createElement("img");
var imageParent = document.getElementById("body");
image.id = "id";
image.className = "class";
image.src = searchPic.src;            // image.src = "IMAGE URL/PATH"
imageParent.appendChild(image);

// Set src in pic1
document["#pic1"].src = searchPic.src;

// or with getElementById

document.getElementById("pic1").src= searchPic.src;

// jQuery to archive this,
$("#pic1").attr("src", searchPic.src);