JavaScript 实现自定义考勤日历组件

 function initCalendarBody() {
  $content = document.createElement("div");
  addClass($content, "div_calendar_body");
  $elem.appendChild($content);
  addCalendarHead();

  //日期计算bug，例：2017-01
  var num = 0;
  do {
   var length = 0;
   if (num == 0) {
    //出星期天外，星期数(1~6)和第一行显示的日期数(7~2)，相加的结果都为8
    length = firstWeekDay == 0 ? 1 : 8 - firstWeekDay;
    num = length;
    createLine(length - 1, 1);
   }
   else {
    var length = mds - num > 6 ? 7 : mds - num;
    num = num + length;
    createLine(length - 1);
   }
  }
  while (num < mds)
  showCurrentDate();
 }

 function createLine(num, type) {
  var newDiv = document.createElement("div");
  for (var i = 0; i <= num; i++, index++) {
   var span = document.createElement("span");
   var span_text = document.createTextNode(index + 1);
   //单个日期元素的操作
   if (attendances && attendances.length > 0) {
    bindAttendance(span, attendances[index]);
   }
   span.appendChild(span_text);
   newDiv.appendChild(span);
  }
  if (type == 1) {
   addClass(newDiv, "first_div")
  }
  else {
   addClass(newDiv, "last_div")
  }
  $content.appendChild(newDiv);
 }

.div_calendar {
 width: 450px;
 margin: 0 auto;
 text-align: center;
 display: -webkit-box;
}

/** 日历标题 */
.div_calendar_title {
 width: 450px;
 margin: 0 auto;
 text-align: center;
}

/** 日历主体 */
.div_calendar_body {
 width: 350px;
 text-align: center;
}

/** 日元素 */
.div_calendar span {
 width: 50px;
 display: inline-block;
 text-align: center;
 line-height: 50px;
}

/** 正常 */
.div_calendar span.normal {
 color: blue;
}

/** 迟到 */
.div_calendar span.late {
 color: red;
}

/** 缺勤 */
.div_calendar span.absense {
 color: #666;
}

/** 缺勤 */
.div_calendar span.today {
 border-radius: 50%;
 background: cornflowerblue;
}

/** 日历第一行日期 */
.div_calendar .first_div {
 text-align: right;
}

/** 日历末行日期 */
.div_calendar .last_div {
 text-align: left;
}

/** 日期显示div */
.div_calendar .div_currentDate {
 text-align: right;
}

.div_calendar .changeDate {
 cursor: pointer;
}

.div_calendar .div_currentDate span {
 width: inherit;
}

.div_calendar .div_currentDate span em {
 margin: 5px;
}

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <link href="css/style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="div_calendar_title"><h1>自定义日历</h1></div>
<div id="calendar_div" class="div_calendar">
</div>
<script src="script/attendanceCalendar.js"></script>
</body>
</html>