how to check condition of query selector queryselectorall in javascript code example

Example 1: query selector has clas

document.body.classList.add('thisClass');
// $('body').addClass('thisClass');

document.body.classList.remove('thatClass');
// $('body').removeClass('thatClass');

document.body.classList.toggle('anotherClass');
// $('body').toggleClass('anotherClass');

Example 2: document.queryselectorall extract all href element

[].forEach.call( document.querySelectorAll('img.PinImageImg'), 
function  fn(elem){ 
    console.log(elem.src);
});