Programmer Think

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 ...

Four rules Let's first understand the following four rules for reference types: 1. Reference types have object properties, which can be extended freely. 2. Reference types have an implicit prototype__ proto__ Property. The property value is an ordinary object. 3. Reference types, implicit prototypes__ proto__ The property value of points t ...

background Taking the microservice system built by SpringCloud as an example, using the front-end and back-end separated architecture, each system will provide some general request parameters, such as system version information and IMEI information on the mobile end, IP information on the Web end, browser version information, etc. these parame ...

New features In view of the previous shortcomings, some experience tags and new form attributes are addedHowever, these new attributes have some version compatibility problems. Basically, they can only be supported by IE9 +div has no semantics for search engines 1. New semantic tags Picture from Dark horse programmer pink teacher fr ...

Advance preparation For the smooth development of the story, we first create a table and insert some records into the table. The following is the SQL statement: CREATE TABLE hero ( number INT, name VARCHAR(100), country varchar(100), PRIMARY KEY (number), KEY idx_name (name) ) Engine=InnoDB CHARSET=utf8; INSERT INTO hero ...

Learning links: https://www.bilibili.com/video/BV1Sy4y1C7ha JavaScript basic syntax dom-bom-js-es6 new syntax jQuery data visualization ecarts dark horse pink teacher's front end introduction video tutorial, P204~P246 catalogue 1. Operation elements 1.1 case of imitating JD to display and hide password plaintext 1.2 case of closing QR code ...

The calculations provided on Math objects are much faster than those implemented directly in JavaScript, because the calculations on Math objects use more efficient implementations and processor instructions in the JavaScript engine. However, the problem with Math calculation is that the accuracy will vary depending on the browser, operating sy ...