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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Calendar</title>
</head>
<body>
<style>
.month, .month.vert .week, .day { display:inline-block; }
.month.vert .day { display:block; }
.day { border:1px solid #ccc; width:30px; line-height:30px; text-align:center; }
</style>
<div class="month"></div>
<script>
var calendar = {
update: function (year, month) {
this.days.length = 7;
var stepDay = new Date(year, month, 1);
stepDay.setDate(1 - stepDay.getDay());
var lastDay = new Date(year, month + 1, 0);
lastDay.setDate(lastDay.getDate() + 6 - lastDay.getDay());
while (stepDay <= lastDay) {
this.days.push(stepDay.getDate());
stepDay.setHours(24);
}
},
render: function () {
var html = '';
for (var i = 0, j = 0; i < this.days.length; j = ++i % 7) {
if (j == 0) html += '<div class="week">';
html += '<div class="day">' + this.days[i] + '</div>';
if (j == 6) html += '</div>';
}
this.element.innerHTML = html;
},
toggle: function () {
this.element.classList.toggle('vert');
}
};
var today = new Date, thisYear = today.getFullYear(), thisMonth = today.getMonth();
calendar.days = ['S', 'M', 'T', 'W', 'T', 'F', 'S'];
calendar.element = document.querySelector('.month');
calendar.element.addEventListener('click', function () { calendar.toggle() });
calendar.update(thisYear, thisMonth);
calendar.render();
</script>
</body>
</html>
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