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) are involved in both the start and end signs and regular expressions ). Then we will propose some anti-collection methods. 1. restrict the number of visits to IP addresses per unit time Analysis: no common person can access the same website five times in one second, unlessProgramBut with this kind of preference, there will be a search engine crawler and a nasty collector. Disadvantages: one-size-fits-all, which also prevents search engines from
1. Do not make any assumptions (JavaScript is an unreliable Assistant)One of the most important features of JavaScript that may not be abrupt is-you have to stop any assumptions:* Do not assume that JavaScript is available. You 'd better think it is probably unavailable, rather than relying on it directly.* Before you test and confirm that some methods and attributes can be used, do not assume that the browser supports them.* Do not assume that the HT
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