判斷當前日期是否在當前周

 datebox組件的屬性：

當值發生變化時執行limitDate

options:{onShowPanel:reInitIframeHeght,editable:false,required:true,onChange:limitDate}

下面是limitDate方法：

		function limitDate(newDate, oldDate){
			if(newDate){
				newDate = new Date(newDate);
				var now = new Date();
				var limit = newDate.getTime() < now.getTime() - now.getDay() * 24 * 60 * 60 * 1000
					|| newDate.getTime() > now.getTime() + (7 - now.getDay()) * 24 * 60 * 60 * 1000
				if(limit){
					var edDate = $('#dg').datagrid('getEditor', {
						index: editIndex,
						field: 'Date'
					});
					$(edDate.target).datebox('setValue', oldDate);
				}
			}
		}