BuildAndInitAll returns all of the enable spider.

CoolDownTime sets the sleep time after crawlOnce, the purpose is to reduce the risk being banned of ip by the website.

Limit sets the rule used by the Collector.

NewSpider creates a new Spider with name and default configurations.

Period sets the interval duration, which is used to set the sleep time after each url is crawled.

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NameOfYun 云代理，质量较高.

Spider provides the instance for crawling jobs.