todayDivAttr = {time: today.time,title: today.tooltip,class: 'day '+today.type+' '+today.extraClass+' '+(today.valid ? 'valid' : 'invalid')+' '+(highlightToday?'real-today':'')};
class是保留字，作为json键名称一定要用引号扩起，保留字都要用引号扩起
'class':