Programmer Think

brief introduction The full name of ES is ECMAScript, which is the specification of scripting language, and JavaScript is an implementation of ES, so the new feature of ES can also be called the new feature of JavaScript. Why learn: Simple grammar and rich functions.Using the framework to develop applications, such as front-end development u ...

When learning becomes a habit, knowledge becomes common sense. Thank you for your likes, collections and comments.The new video and articles will be sent to WeChat official account for the first time. Li YongningThe article has been included in github warehouse liyongning/blog , welcome to Watch and Star.targetDeeply understand the initializati ...

When learning becomes a habit, knowledge becomes common sense. Thank you for your likes, collections and comments. The new video and articles will be sent to WeChat official account for the first time. Li Yongning The article has been included in github warehouse liyongning/blog , welcome to Watch and Star. target Deeply understand the init ...

preface: Following the monitoring of fishing behaviors such as playing games and watching videos, the tendency of migrant workers to leave will also be monitored. Some netizens broke the news that Zhihu was laying off low-key staff, and the video related departments had to lay off almost half. In the discussion area of Zhihu layoffs, some net ...

JSR303 performs data verification 1. Add verification annotation to Bean Multiple annotations can be verified @NotBlank(message = "Brand name cannot be empty") private String name; //Cannot be empty + custom rule @NotEmpty @Pattern(regexp = "!/^[a-zA-Z]$/",message = "The search initial must be a letter") private String firstLetter; //Canno ...

Many times, PowerShell administrators must manually scan the server to see the performance problems of the server in the network. This can happen when one of the servers is not responding or unresponsive and causes performance problems on the related servers. In this case, knowing the memory usage of the server will help determine which particu ...

Simple analysis of ReentrantLock source code Most of the content comes from reprint https://www.cnblogs.com/waterystone/p/4920797.html , I only wrote the state and Condition sections, Author: Water rock source: http://www.cnblogs.com/waterystone Articles not reproduced in this blog belong to the author Water rock It is shared with the b ...

Preprocessing is an important function of C language, which is completed by preprocessor. When compiling a source file, the system will automatically call the preprocessing program to process the preprocessing part of the source program. After processing, it will automatically enter the compilation of the source program. C language provides a ...

There are multiple radar function packages under the lidar folder. It also includes a udev rule conversion script. The radar uses cp2102usb to serial port chip. Multiple devices are connected to the host through usb, so it is difficult to distinguish the devices corresponding to each port name. Set rules for the chip of USB to serial por ...

I haven't opened my blog for a long time. I found that my previous blog had a certain number of views. I was surprised and felt that blogging was very meaningful. Let's talk about html related knowledge today 1. Two box models As we all know, the element in our page is a box, which has width, height, border, padding and margin. Calculation o ...