static get observedAttributes () {
        return ['title', 'reverse', 'for', 'eventType', 'align'];
    }
@Tips.js
@author zhangxinxu
@version
@Created: 15-06-25
@edit:    17-06-19
@edit:    20-06-09 edit by y2x
@edit:    20-11-03 by zxx