var b = document.getElementsByClassName('.click_link');
var c = document.getElementsByClassName('.open');
b.onclick = function() {
if (b.hasClass('active')) {
c.addClass('active');
} else {
c.removeClass('active');
}
}
const button = document.querySelector('.button')
$('button').on('click', function(){
if($('.block1').is(':visible')){
$('.block1').slideUp(300);
$('.block2').slideDown(300);
}
else{
$('.block1').slideDown(300);
$('.block2').slideUp(300);
}
});