Programmer Think

1, Introduction The function of this blog post is to select an element on the map and pop up its corresponding information window. For example, my internship theme is the historical buildings in Wuhan University. I can choose Song Qing gymnasium, like this. Then click "Introduction to architecture", and the software will pop up a wi ...

1, Introduction 1 grayscale The process of converting color image into gray image is called image graying. The pixel value in the color image is determined by the three RGB components, and each component has 0-255 (256) choices. In this way, the pixel value of a pixel can have 16 million possibilities (256256256), while the pixel value of the ...

Search navigation bar by category, you need to achieve: Wallpaper classification can slide horizontally, click on the classification to search for the corresponding classified wallpaper pictures; When the page scrolls down to the Category Search Navigation Bar, it needs to be docked at the top of the page to show a ceiling effect. When the page ...

Preface Native drag events have many criticisms. For example, the element that follows the mouse pointer when dragging is too simple. For example, dataTransfer is inaccessible except for start and drop, which makes drop elements less likely to accept drop. For example, there is no elegant way to set the mouse pointer during dragging. For examp ...

Here we recommend a free and convenient mall project: Source code through train > > > Under Linux, we often need to view the hardware information of the system. Here I list the practical commands for viewing the hardware information of the system, classify them and explain them with examples. Execution environment: ubuntu 16.04 1. c ...

1, Project introduction The main function of this project is to support dragging the text editing area or commodity picture to the canvas for editing and adjustment according to the uploaded background picture as the canvas, and finally generate the picture and css style for use by other terminals. This project is based on html/vue/css / n ...

SpringCloud Alibaba Nacos What is Nacos Nacos is the first two letters of Naming and Configuration, and the last S is Service A dynamic service discovery, configuration management and service management platform that is easier to build cloud native applications Nacos is the combination of registration center + configuration center Eureka+C ...

What is a hash table? Hash tables, also known as hash tables, are array based. This indirectly brings an advantage: the time complexity of search is O(1), and of course, its insertion time complexity is also O(1). There is also a disadvantage: the expansion cost is high after the array is created. There is a "mainstream" idea in hash ...

1, MySql installation Machine preparation: 10.117.201.80 (slave server, 8 cores), 10.117.201.81 (master server, 16 cores) Download mysql installation package: mysql-5.7.30-linux-glibc2.12-x86_64.tar.gz Upload to two linux servers [root@mon mysql]# pwd /usr/local/mysql [root@mon mysql]# ls mysql-5.7.30-linux-glibc2.12-x86_64.tar.gz decompr ...

Deep understanding of thread pool Fork Join in concurrent programming 1, What is Fork Join Maybe junior programmers don't know what Fork Join is. Let's take a simple example to illustrate: Suppose we need to send 10W emails in groups, which method may we use? Some people may say that using threads or thread pools, each thread sends ...