Hello everyone, the editor will answer the question of javascript:void($=o). Many people still don’t know javascript void o, let’s take a look at it now! JavaScript object-oriented (ES5 article) 1. JavaScript object-oriented 1. Several ways to create objects in JavaScript 1. 1. Constructor pattern 1. 2. Factory mode 1. 3. Prototype mode 1. 4. Combined […]
Tag: void
Java car automatic path finding and obstacle avoidance avg scheduling simulation
uml diagram Graph.java import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * @author: * @description：TODO * @date: 2023/3/4 1:53 */ public class Graph {<!– –> public int v; // number of vertices public int e; // number of edges static public List<List<Path>> pathArrayList = new ArrayList<>(); static public List<Node> nodes = new ArrayList<>(); static public int […]
Actual measurement: Oracle 19C hot cloning application pitfall avoidance guide
1. Background As Oracle 11g enters the extended support stage, Oracle 19C, as the final stable version of the 12C family, has been well known and used in production by most companies. My company is also trying to deploy, test, upgrade, and migrate 19C, so I took this opportunity to test the hot cloning feature. […]
[SCM graduation project] [cl-010] Intelligent fire extinguishing car | Tracking and obstacle avoidance car | Infrared tracking car | Ultrasonic obstacle avoidance car
1. Basic introduction Item name: Design of intelligent fire-fighting trolley monitoring system based on microcontroller Design of monitoring system for tracking and obstacle avoidance car based on single-chip microcomputer Design of infrared tracking car detection system based on microcontroller Design of ultrasonic obstacle avoidance car system based on microcontroller Project number: mcuclub-cl-010 Microcontroller type: STC89C52, […]
C++ Standard Templates (STL) – Type Support (type attributes, is_void, is_null_pointer, is_integral)
Type attributes A type attribute defines a compile-time template-based structure for querying or modifying the properties of a type. Attempting to specialize a template defined in the header causes undefined behavior, except that std::common_type can be specialized as described. Templates defined in the header file may be instantiated with incomplete types unless otherwise specified, although […]
Solve Vue error: Uncaught (in promise) NavigationDuplicated: Avoided redundant navigation to current location
1. When clicking navigation repeatedly, an error message appears on the console Solution: Option 1: Just add the following code under the router folder: import Vue from ‘vue’ import VueRouter from ‘vue-router’ import Home from ‘@/views/Home’ import Main from ‘@/views/Main’ import User from ‘@/views/User’ Vue.use(VueRouter) // 0. If you use the modular mechanism to program […]
javascript:void appears on the web page, and there is javascript in the lower left corner of the page
Hello everyone, the editor will answer your question about why the exclamation mark appears in the lower left corner of the web page. Many people still don’t know that javascript appears in the lower left corner of the computer browser, let’s take a look now! Table of Contents Introduction to JS JS consists of three […]
to avoid detours! Thoroughly learn the practical application of spring source code
Introduction I believe that everyone can often encounter the export of various excels on projects. Simple excel formats can be exported using simple poi, easyExcel and other tools. However, for complex Excel, there are various requirements such as fixed styles, merged cells, dynamic columns, etc., resulting in Excel export requiring a lot of effort to […]
How does the flash sale system avoid oversold inventory?
public String buy(Long goodsId, Integer goodsNum) { //Query product inventory Goods goods = goodsMapper.selectById(goodsId); //If the current inventory is 0, it will prompt that the product has been sold out. if (goods.getGoodsInventory() <= 0) { return “The product has been sold out!”; } //If the current purchase quantity is greater than the inventory, it will […]
How to avoid using too many if elses?
1. Introduction I believe you have heard of callback hell – callback functions are nested layer by layer, which greatly reduces code readability. In fact, if-else is nested layer by layer, as shown in the figure below, which will also form a situation similar to callback hell. When the business is more complex, there are […]