Programmer Group

Niuke portal KMP's practices are not understood yet. Here are two SAM practices. Thank you for the ideas provided by the codes of the two teams of cherry pig driving a meow car to create a big white bear and novice on the road. The first approach is a little more troublesome: For each prefix, the substring with the largest dictionary order mu ...

The paper is Bioactivity descriptors for uncharacterized chemical compoundsLocal storage file name s41467-021-24150-4.pdfThe official account of the public address asked some readers' comments on the implementation of some of the drawings in this paper, but I did not find the original data used for drawing. It's still troublesome to reproduce. ...

1. Life cycle The process of an object from creation to destruction is a life cycle, in other words, a callback method. It has been encapsulated in fluent to know what state the widget is in, and then give you a callback corresponding to the state. Therefore, the life cycle is actually a series of callback methods. So what does the life c ...

1, BIO (Blocking IO) 1. Characteristics In the synchronous blocking model, a thread can only process one request 2. Shortcomings The read operation in IO code is a blocking operation. If the connection does not read and write data, it will cause thread blocking and waste resources If there are many threads, there will be too many server t ...

Before we know about LRU, we should know about cache. We all know that the computer has cache memory and can temporarily store the most commonly used data. When the cache data exceeds a certain size, the system will recycle it to free up space to cache new data, but the cost of retrieving data from the system is relatively high. Cache requirem ...

Module expansion and cognition   · Process oriented programming   · Module introduction   · import sentence pattern   · from...import... Sentence pattern   · Circular import problem   · Absolute import and relative Import   · Software development cata ...

What is SQL injection The first is the security vulnerability in the database layer of the Web program, which is the simplest vulnerability in the website.The main reason is that the program does not judge the legitimacy of the user input data, so that the attacker can add additional SQL statements to the pre-defined SQL statements in the Web ...

The article continues above, Ways and skills of small programs nesting H5 (1) 4, Refresh the embedded H5 page of WEV view     1) Why should we refresh the embedded H5 page of WEV view?         Many business scenarios require developers to update the page data every time they open the page. It is relatively simple ...

leadThe project needs an effect: when scrolling down the list, the custom view at the top does not move, and when moving up, the top view is hidden to improve the display range of the list. On this basis, Shanghai adds a dynamic fade in and fade out effect when hiding the list, as follows:realizationThe key point of implementation is that the t ...

Pre knowledge, six principles of design pattern General principle: Open Close Principle The opening and closing principle means that it is open to extensions and closed to modifications. When the program needs to be expanded, you can't modify the original code, but expand the original code to achieve a hot plug effect. So in a word, in order t ...