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严师傅说，他不会什么高深的武功，他会的，就是杀人。(3) Vision: Both eyes have not undergone any surgery, and the naked vision of any eye (according to the C-character visual acuity chart) is not less than 0.3, without color blindness, color weakness, strabismus, severe trachoma or trichiasis;Analysis: Is Math.power (2, 53) the maximum value that can be expressed in JS, the maximum value plus 1 or the maximum value. What happened was this:, so it can never be greater than Math.power (2, 53).Thanks to Tengxunyun's friends, they provided a high-security IP, which enabled the website to go online again. Now, my protection is that there is a CDN in front of the source server. If the domain name is attacked, CDN can block it. If I directly attack the source server, I bought a flexible IP, which can dynamically mount the host instance and change the address when attacked. This is just a technical blog, the content is free, to prevent this point, I am speechless.Public class Test {In this example, the policy pattern is used to encapsulate the algorithm. However, in practice, it can be used to encapsulate almost any type of rules, as long as the similarities between different rules are analyzed and abstracted