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Why do many websites wait a few seconds before automatically downloading resources? What are the reasons?

WBOY
Release： 2016-08-04 08:53:59
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Why do many websites wait a few seconds before automatically downloading resources? What are the reasons?
As shown in the picture, many websites have N seconds of waiting time before automatically downloading resources. I would like to know what considerations this is based on.

Possible answers collected so far:

  • One saves disk IO, two advertisements, three anti-crawlers, four fraud pv

  • Anti-hotlinking and anti-swiping

Please explain in detail. .

Related labels：
html javascript php python
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