//通过url分析一个页面，获得PageItems
func (this *Spider) Get(url string, respType string) *page.PageItems {
//TODO
req := page.NewRequest(url, respType, "GET")
return this.GetByRequest(req)
}
func (this *Spider) AddUrl(url string, respType string, urlType string) *Spider {
req := page.NewRequest(url, respType, "GET")
req.SetUrlTag(urlType)
this.AddRequest(req)
return this
}