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2021SC@SDUSC 2021SC@SDUSC ReactHooks In the previous article, we introduced what the react hooks initialization does. Next, we analyzed the update phase and explained that the previous workInProgress tree has been assigned to the current tree. The memoizedState storing hooks information already exists in the current tree. The processing ...

The HashMap data structure is very useful in most development scenarios, so we must understand its underlying principle when using it, so that we can skillfully optimize our program according to its design when using it. Later, I will explain several problems and try to be easy to understand. 1. How is the process of hash index calculation imp ...

1. Basic package type To facilitate the operation of basic type values, ECMAScript provides three special reference types (basic wrapper types): Boolean, number and string. Whenever a basic type value is read, a corresponding basic wrapper type object will be created in the background, so that some methods can be called to operate the data. ...

First, the definition of modularity. ① With file scope ② With communication rules: Rules for loading and exporting 2, CommonJS module specification 1. The module system in nodejs has file scope and communication rules. It uses the require method to load the module, and uses the exports interface object to export the members of the module. 2 ...

               When you want to update your Web application in real time, you can rely on old-fashioned periodic polling or try some modern technology with push function. Your first impulse may be to use WebSockets . However, if you only want to receive data from the server, you can use Server Sent Events. Traditionally, web pages ...

1, ES5 (ECMAScript version 5) 1. Add a function in the array Judgment function          every() is used to judge whether all elements in an array meet the requirements. The format is as follows: var Judgment result=array.every( function(Current element value n,Current subscript i,Current array ...

1. The core of front-end Routing: Change the URL without overall refresh: Implementation methods: 1) hash of URL 2) history of html5 2. hash of URL location.hash=' ' 3. history of HTML5 history.pushState({}, ' ' , 'home' ) history.replaceState({},'','home') pushState() is like entering and exiting the stack. It is a stack structure that ca ...

Iife (self executing function) IIFE (Immediately Invoked function Expression) is a function expression called immediately. This function is called immediately when it is declared. The so-called self executing function, as the name suggests, is a function that is executed immediately after definition. Generally, it has no name and will only be ...

JavaScript is a descriptive scripting language, which is different from java or C# and other compiled languages. It does not need to be compiled into an intermediate language, but by browser Dynamically parse and execute. The code cannot be run directly. It needs to be compiled by the JavaScript compiler. Only the compiled code can be recognize ...

🌊 Author home page: Hai Yong 🌊 About the author: 🏆 CSDN high-quality creators in the whole stack field 🥇 HDZ core group members 🥈 Ranked among the top ten in the weekly list of station C 🌊 Fan benefits: 👉 Fan group 👈 Four books per week and various small gifts per month (enamel cup, pillow, mouse pad, mug, etc.) Jump straight to the ...