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In the compilation of resident choice components, my original idea was to achieve the effect like above, showing the name, telephone number, ID number of the residents, and grouping them according to the plot and building, but there were some bug in the group.When I get residents again, I get all residents first and then pass filter to obtain t ...

[algorithm] sword finger Offer special assault version Day4 array part Title address: https://leetcode-cn.com/study-plan/lcof/?progress=wgzvtig Objective: summarize key points and share ideas Note: under reasonable conditions, only use the code that is the simplest to understand and practical to use I [medium] 010 Subarray with and k ...

What I wrote earlier: most of this article (all of it is OK) is copied, and the materials in the classroom are very good. I feel ashamed of writing, but if I don't write it, it will affect the content of the whole blog. I'll revise / write my notes later. Thank you for passing by. I hope the student's notes can give you a trivial reference (2 / ...

1.IO stream classification According to the direction: input stream (such as the file you copied) output stream (such as the new file you copied) By unit: byte stream (data transmission in bytes) Character stream (data transmission in characters char) According to function: node flow (equivalent to needle) filter flow (equivalent to needle ...

prefaceIn introduction to database transactions and learning notes on MySQL transactions (I), we have discussed transaction related concepts, transaction related operations, how to start a transaction, rollback, etc. How should we do the transaction operation in the program. In Java, transactions are controlled through JDBC API. This method is ...

object Everything in JavaScript is an object: strings, numbers, arrays, dates, and so on. In JavaScript, an object is data that has properties and methods. Property is a value associated with an object. Methods are actions that can be performed on objects Keywords () For example: cars are objects in real life. Car properties: car.name=Fiat n ...

What is a regular expression? Regular expressions are objects that describe character patterns. Regular expressions are search patterns formed by a sequence of characters. Syntax of regular expression: / regular expression body / modifier (optional) For example: const exp = /abc/i /abc/i is a regular expression, where abc is a regular expre ...

Supplement 4 When the connection is closed by default, we will submit it automatically, Each rollback is rolled back to the previous submission Transfer operation without considering database transactions When we finished the first transaction, we committed. As a result, an exception occurred, resulting in a direct exit. The subsequent t ...

Generally speaking, javaweb has learned one article. At that time, I just took it over. I didn't practice some things myself and forgot many of them. So I'll review it quickly here. I won't review the contents of HTML and CSS here. I'll review it from JavaScript. 1. JavaScript introduction The birth of JavaScript language is mainly to complet ...

This paper mainly illustrates with examples: As shown below, a Pod collection that provides web services is composed of two copies of Tomcat containers. The service port number provided by each container is 8080: apiVersion: apps/v1 kind: Deployment metadata: name: webapp spec: replicas: 2 selector: matchLabels: app: webap ...