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This article introduces the relevant knowledge of "what are the basic data types of JavaScript". In the operation of actual cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. HTML: HTML Hypertext markup language, which is used to generate web pages seen by users on browsers. We need to have an in-depth understanding of him. HTML5 is currently in use in the market.

2, CSS: he is the HTML style sheet, which is used to display the style of the web page on the browser, that is, to control the font, color, size, width and height of the web page, and to make the effect of the web page on the browser dynamic.

3, JavaScript, it and Java in the syntax of some hi is similar, but they are relatively independent languages, JS can allow some simple business processes in the browser to calculate and submit to the background, but also can change the browser CSS, so that we make the web page more powerful.

See here, many people will ask, Java is a back-end development language, why to learn the front-end language knowledge?

At present, the demand for talents in major enterprises is getting higher and higher, and comprehensive talents can improve their competitiveness. Moreover, if you need to develop the background of a website at work, when communicating with front-end colleagues, you already have an in-depth understanding of the front-end language, so your work efficiency can be improved to a certain extent. If both of you only know your own language, there will be no less rework.

4. Java, a qualified Java programmer, must be proficient in the basic language and framework of Java, as well as the multithreading of Java, although many of them are not in-depth understanding of multithreading, and thread locks are rarely used, but threads are a very important part of Java.

5, Spring, it is a perfect collection of tools to build Web applications, the current market JavaWeb projects can see its figure, Spring Ioc container and dependency injection, compared with other frameworks more convenient to manage, its SpringMvc can directly replace the Struts framework, SpringSecurity is also a very powerful security tool, Spring is a more perfect integration of other major frameworks.

6. Struts, before the emergence of SpringMvc, Struts is an indispensable framework to replace Servlet. With Struts, we can achieve the same function as Servlet. It is more simple and clear to configure, and we can configure different filters under different requests.

7. Orm framework, divided into Jdbc,Hibernate,Mybatis, these three are the three Orm frameworks with high utilization at present. As a JavaWeb project, database is essential. Jdbc framework is a framework that beginners must learn, and it is also the underlying implementation of Hibernate framework and Mybatis framework. However, it is more tedious to use Jdbc framework alone. Hibernate and Mybatis perfectly encapsulate the Jdbc,Hibernate framework with more powerful functions, including acoustic Sql query and Hql query. The sample query encapsulated by Hibernate, Criteria query, is a little more difficult to learn than Mybatis. Mybatis needs to have a good Sql foundation. In contrast, although the function of Hibernate is more comprehensive, the insertion speed of single table query is slightly slower than Mybatis.

8. Redis, as an open source in-memory database, is faster than disk databases such as Mysql. It supports many types of data structures, such as String, Hash, List, Set, SortedSet or ZSet. It does not require split tables and stores key-value pairs. Because it is an in-memory database, it does not involve IO, so it runs very fast. It is commonly used as a cluster, or as a message queue.

9. SringBoot, when building a small website, the advantage of Java is not as powerful as php, the Java project is relatively cumbersome, the SpringMvc project needs to configure a lot of xml files, the configuration of xml undoubtedly increases the programmer's workload, SpringBoot omits all these links, and the built-in server can be started directly without tomcat, built-in web.xml can be configured directly in properties, and the project is built very quickly Is the current mainstream framework.

10. Bootstrap, which is a front-end framework, using bootstrap allows background programmers with mediocre front-end technology to quickly build background or official website pages, and the functions needed to continue can be found in bootstrap, a very powerful front-end tool.

11, Linux server, the current mainstream server is not windows system, Linux server is more open source than windows, memory cpu will be smaller than Windows, but Linux does not have a visual interface, the operation is not as simple as Windows, but shell script provides a lot of convenience, developers can do almost anything they want to do when developing.

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