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也许我们的知音会迟到，但是他/她却不会不来…………一连下了五六天的雪，天空终于放晴。However, this method has great limitations. XMLHttpRequest requests are usually used for asynchronous refresh of local pages in Ajax methods. Not all requests are suitable to be initiated by this class, and the pages obtained through this class of requests cannot be recorded by browsers, thus carrying out operations such as forward, backward, refresh and collection, which brings inconvenience to users. In addition, for legacy systems that do not have CSRF protection, to use this method to protect, to change all requests to XMLHttpRequest requests, this is almost to rewrite the entire website, which is undoubtedly unacceptable.System form (referring to pipe network, no pipe network, combined distribution, independent type, high pressure, low pressure, etc.), number and location of protection areas protected by the system, location of manual control device, location between steel cylinders, type of extinguishing agent, and diagram of gas fire extinguishing system.· Increased sweating;