Programmer Think

Four positioning methods of CSS layout 1. static: Default value. Without positioning, the element appears in the normal flow (ignoring the top, bottom, left, right or z-index declarations). Refer to the previous essay. 2. relative: The element positioned as relative deviates from the normal document flow, but its position in the document fl ...

preface Although there are mature and useful libraries for dealing with dates, such as momentjs and date FNS, sometimes we don't need the whole library in actual development. Therefore, I have sorted out various operations on date and time in front-end development, which is relatively complete. Some of them come from ourselves and some from ou ...

Introduction to distributed apollo Apollo (Apollo) is an open source configuration management center developed by Ctrip framework department. It can centrally manage the configuration of different application environments and clusters. After the configuration is modified, it can be pushed to the application end in real time, and has the charac ...

The search engine must not default. ElasticSearch, which is often used in our project, is a search engine and is essential in our log system. ELK, as a whole, is basically standard for operation and maintenance. In addition, the bottom layer of the current search engine is based on Lucene. Xiaobian recently encountered a demand. Because the da ...

1. Differences between static variables and instance variables Static variable: because static variables do not belong to any instance object and belong to a class, there will only be one copy in memory. During class loading, the JVM will allocate memory space for static variables only once. Instance variable: each time an object is created, t ...

**MQ, also known as Message Queue, is a middleware for asynchronous communication** It can be understood as the post office. The sender delivers the message to the post office, and then the post office helps us send it to the specific message receiver (consumer). We don't need to care about the specific sending process and time, and it won't in ...

1, Introduction to nginx Nginx (engine x) is a high-performance HTTP and reverse proxy web server, which is characterized by less memory and strong concurrency. In fact, nginx performs better in the same type of web server. Nginx is specially developed for performance optimization. Performance is its most important consideration. In fact, it ...

I think everyone must have read the explanations and sermons of various "strategic models" more or less. This article is to "clarify" the strategic models and try to answer the following questions: 1. How does the policy pattern optimize the business logic code structure? 2. How can you kill a chicken with an ox knife? Jus ...

In CSS, you can use the position attribute to locate elements. The position attribute specifies the location type of the element. Attribute value: absolute: generates an absolutely positioned element, which is positioned relative to the first parent element other than static positioning. The position of the element is specified by the " ...

1, Foreword The powerful effect of css3 animation is self-evident. Since its emergence, it has been hot, and its advantages and disadvantages with js animation have always been the topic of debate in the front-end industry. There is no doubt that the emergence of css3 animation reduces the difficulty of realizing animation effect to a certain ...