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introduction: On node Another important and basic pattern used in JS is the observer pattern, which is also one of the pillars of the platform and a prerequisite for using the node core and user module The observer defines an ideal solution for building nodes JS response characteristics, and is a perfect complement to callback. A formal ...

1, SpringBoot project environment IntelliJ IDEA 2018.3.2Mysql 5.1 2, Tencent cloud CentOS 7.6 image server Students can apply for Tencent cloud student exclusive, 27 yuan for three months 3, Attention (1) XShell Modify host namehostnamectl set-hostname master #Set to master name View current hostnamehostname After modifying the hos ...

1, Install java project Install jdk and tomcat. Please refer to the article Configuring multiple tomcat on one linux server 2, Installing nginx Please refer to the article Linux Installation nginx steps 3, Install nginx VTS export 1. Install git yum install git -y 2. Install nginx VTS export git clone https://gitee.com/mirrors/nginx-mo ...

preface link Niuke Xiaobai monthly race 45 Finish five questions for the first time hh Try to write a solution The codes are directly copy the game time codes, which may be messy I'll try to write notes hh If you have any questions, please point them out hh A This problem is difficult to read... If n > = x Then you can jump horizont ...

Get ueeditor Download UEditor source code from the official website. There is no UEditor in the downloaded source code all. JS file. You need to use grunt to package the source package into a deployment Version (including ueditor.all.js file) Install node jsGlobal install grunt (NPM install - G grunt CLI)The command line switches the director ...

Collection query INTERSECT and INTERSECT operations include INTERSECT and INTERSECT Query students in the Department of computer science and students under the age of 19 SELECT * FROM STUDENT WHERE SDEPT='CS' UNIOM SELECT* FROM STUDENT WHERE SAGE<=19; Example 3.65 query the students who have elective course 1 or elective course 2 SEL ...

Firewall firewall policy details 1, Firewall firewalld Firewall is Centos7 The default firewall management tool of the system replaces the previous one iptables In the firewall layer, packet filtering also belongs to the network. firewalld and iptables are tools used to manage firewalls (in user mode) to define various rules and functions o ...

identifier In Python, all identifiers can include English (case sensitive), numbers, and underscores (), But it cannot start with a number. Start with a single underscore_ The class to be imported cannot be accessed directly through the class provided by XXX, but the class provided by foo. Double underlined__ foo represents the private membe ...

Inheritance reflects the hierarchical relationship between classes Polymorphism is to consider this hierarchical relationship and the relationship between specific member functions of the class itself to solve the problem of behavior re abstraction 5.1 static binding and dynamic binding Polymorphism: the phenomenon that the same symbol or nam ...

This section mainly explains how to use Apollo in ordinary Java projects and Spring Boot. Used in ordinary Java projects Add Maven dependency of Apollo Client. The code is as follows. <dependency> <groupId>com.ctrip.framework.apollo</groupId> <artifactId>apollo-client</artifactId> <version&gt ...