Programmer Think

I. What is Vue.js Vue.js: A progressive framework for building user interfaces. The core library of Vue focuses only on the view layer. Installation: Vue.js provides an official command-line tool that can be used to quickly build large single-page applications. The tool provides out-of-the-box configuration of building tools, ...

Enumeration concept Enumeration types (also known as enumerations) provide an effective way to define a set of named integer constants that may be assigned to variables. This type is declared using the enum keyword. Example code 1 enum Day { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday }; By default, the basic type of ...

Original text: https://legacy.ofcrab.com/press/javascript-new.html If we talk about JavaScript's new in an object-oriented way, it's still hard to understand. We can understand it in another direction. You humans I am a programmer and a person. I may: There's a loud name. Born on a certain day It's a man. I can walk. I can still run. Still hop ...

problem (1) What's the difference between Collection and Set? (2) How does HashSet ensure that elements are not duplicated? (3) Does HashSet allow null elements? (4) Is HashSet orderly? (5) Is HashSet synchronous? (6) What is fail-fast? brief introduction Set, the concept is a little vague. Generally speaking, collections in Java refer to cont ...

Introduction to Spring Framework: In February 2003, the Spring Framework became an open source project and was released in SourceForge. Solutions devoted to Java EE applications, rather than focusing only on one level of solutions, are the "one-stop" choice for enterprise application development. Throughout the presentation layer, bus ...

Previously, we analyzed ArrayList. We know that ArrayList is implemented by arrays and traverses quickly, but when inserting and deleting, we need to move the elements behind, which is slightly less efficient. In this article, let's look at LinkedList, which is implemented by a two-way linked list. When inserting and deleting linkedList, we on ...

3.1 histogram Histogram is mainly used in the visualization scene of qualitative data, or in the distribution display of classification features. Then the graphics derived from the histogram are stacked histogram, and multi-data parallel histogram. eg1: Simple histogram Previous drawings used plt.xxx to manipulate graphics d ...

create object Although Object constructors or object literals can be used to create a single object, these methods have obvious drawbacks: creating many objects with the same interface can generate a lot of duplicate code. To solve this problem, people began to use a variant of the factory model. Factory mode Factory pattern is a well-known des ...

Dynamic script Definition: Page loading does not exist, but at some point in the future by modifying the DOM dynamically added scripts. There are two ways to create dynamic scripts: Insert external files Insert JavaScript code directly Insert external files var script = document.createElement("script"); script.type = "text/javascipt"; ...

index.js is the entry file for the entire project. // 1. Initialize const app = dva({ history: createHistory(), }); // 2. Plugins app.use(createLoading()); // 3. Register global model app.model(require('./models/global').default); // 4. Router app.router(require('./router').default); // 5. Start app.start('#root'); export default app._st ...