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Introduction:   A server configuration block is an Nginx instruction, which defines the settings for a specified domain name and allows you to run multiple websites on a single server. For each website, you can set the root directory of website files (the directory containing website files), create an independent security policy, use diffe ...

Original title: Spring certified China Education Management Center - Spring Data MongoDB tutorial 14 (content source: Spring China Education Management Center)18.5.6. Wildcard indexAWildcardIndex is an index that can be used to contain all fields or specific fields based on a given (wildcard) pattern. For more information, see the MongoDB docum ...

         It is recommended that front-end developers use ES6 for development, which can reduce the amount of code and increase readability. 1. About value const obj = { a:1, b:2, c:3, d:4, e:5, } Make complaints: const a = obj.a; const b = obj.b; const c = obj.c; const d = obj.d; c ...

Android Bluetooth framework 1, scan in Settings interface Enter the android setting interface and open Bluetooth, and the scanning will start automatically. Let's start with the android Bluetooth setting interface: Bluetooth switch button BluetoothSettings.java (packages\apps\settings\src\com\android\settings\blue ...

Like a process, when a child thread exits, its kernel resources are mainly recycled by the main thread. The thread recycling function provided in the thread library is called pthread_join() is a blocking function. If there are still sub threads running, calling this function will block. The sub thread exits the function to unblock and recycle r ...

Learning resources: Pull hook Education What is a ranking problem Sorting - the process of turning a group of unordered data into order. Generally, the order here is from small to large by defaultMeasure the advantages and disadvantages of a sorting algorithm Time complexity - specifically, the best time complexity, the worst time complexi ...

Environment construction The vulnerability is in the version before yii2.0.38. Download version 2.0.37basic https://github.com/yiisoft/yii2/releases/tag/2.0.37 Modify the value of the / config/web file Enter php yii serve in the current directory to start Reappearance Construct the deserialization entry first Create a new contro ...

1. Process Software download and installationdata acquisitionCustom datasetModel buildingmodel trainingtestsummaryfollow-up Download address of this project GitHub 1. Software download and installation 1.Download address: https://github.com/udacity/self-driving-car-sim 2. After entering the link, you can choose your own platform to download ...

Component communication props Applicable to parent-child component communication Parent component - > child component The parent component passes the parameters to be passed to the child component through key={xxx}, and the child component obtains the parameters through this.props.key import React from 'react' import Son from './son' cla ...

Answer #11: what is the difference between char and varchar in MySQL 1. Experimental scenario GreatSQL 8.0.25 InnoDB 2. Experimental test 2.1 differences parametercharvarcharIs the length variableFixed lengthLengthenstorage capacity 0 ~ 2550 ~ 65,535 2.2 construction test table CREATE TABLE vc (v VARCHAR(4), c CHAR(4)); 2.3 test without ...