匿名First Day of Week
Choose the first day of the week.
示例：
代码：
<div style="margin:20px 0">
<select onchange="$('#cc').calendar({firstDay:this.value})">
<option value="0">Sunday</option>
<option value="1">Monday</option>
<option value="2">Tuesday</option>
<option value="3">Wednesday</option>
<option value="4">Thursday</option>
<option value="5">Friday</option>
<option value="6">Saturday</option>
</select>
</div>
<div id="cc" class="easyui-calendar" style="width:250px;height:250px;">
</div>