Евгений Самсонов

const checkbox = document.getElementById('link5')

checkbox.addEventListener('change', (event) => {
  if (event.target.checked) {
    document.getElementById('tab1').style.display = 'block';
  } else {
    document.getElementById('tab1').style.display = 'none';
  }
})

const x = 6;
const y = 2;
const pattern = new RegExp(`^\\d{0,${x}}(\\.\\d{0,${y}})?$`, 'g');

(
function(id, input) {
    input.addEventListener("change", function() {
        localStorage.setItem(id, input.value);
    });
}
)(id, input);

var fun = function(id, input) {
    input.addEventListener("change", function() {
        localStorage.setItem(id, input.value);
    });
}

fun(id, input);

var fileInput = $('#inputfile');
var dinamicNumber = $('#dinamic_number');
fileInput.change(function(){
    var length = fileInput[0].files.length;
    if (length > 4) {
      fileInput.val('');
      length = 0;
      alert('Не больше 4 файлов');
    }

    dinamicNumber.text(length); 
});

jquery.min.js:4 Mixed Content: The page at 'https://raftlayer.net/' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://raftlayer.net/module/basket/www/basket_ajax.php?func=add&prodId=37'. This request has been blocked; the content must be served over HTTPS.

$(function() {
    var top = 0, bottom = 0, left = 0, right = 0;
    $("#up").click(function() {
        top += 2;
        $("#player").css("bottom", top);
     });
});

<div id="template">
    <input type="text" class="lol">
</div>

var ter = "(255, 0, 0, 0.1)";
var rer = ter.match(/(\d+(.\d+)?)/g);
alert (rer);

var re = /bb\ncc/gm, match;
while (match = re.exec(s)) {
    console.log(match);
}

var params = {
    id: $(this).attr('data-id'),
    comment: $('#comments').val()
};

if (условия){
     что делаем
     return;
}