Дмитрий C

Clock.prototype.start = function() {
  this._render();
  this._timer = setInterval(this._render.bind(this), 1000);

Clock.prototype.start = function() {
  this._render();
  this._timer = setInterval(function() {
    this._render.call(this);
  }.bind(this), 1000);

var textarea = document.querySelector('textarea');

textarea.addEventListener('keyup', function(){
	if(this.scrollTop > 0){
		this.style.height = this.scrollHeight + "px";
  }
});

$('tr', '.translate').each(function(){
var number = $('.number', $(this)),
		price = $('.price', $(this)),
    total = $('.price-one', $(this)),
    amount = number.length ? parseInt(number.html().replace(/\D/g, '')) : 0,
		cost = price.length ? parseInt(price.html().replace(/\D/g, '')) : 0,
    res = amount ? cost / amount : 0;
	
    (total.length) && total.text('$' + res.toFixed(0));
});

$(function() {
var _hlp_bx = $('.explanation');
Изменить на класс, так как id должны быть уникальные
$('.explanation-btn').click(function(e, d) {
var _hlp_bt = $(this)
if(mem) {
....
....
})
}

var table = '<table><tr><td>example</td></tr></table>',
    link = document.createElement('a');
    link.href = 'data:application/vnd.ms-excel,' + table;
    link.download = 'table.xls';
    link.click();