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Basic tutorial for getting started with React What is React? React is a declarative, efficient and flexible JavaScript library for building user interfaces. Using react, you can combine some short and independent code fragments into a complex UI interface. These code fragments are called "components" What are the characteristics of ...

Data binding DataJoin Essence: data is bound with entities, that is, after binding, each entity has its own semantics. For example, in demo2, if the region field in the data is bound to the entity, the entity represents the region Eg: The number of people per country is bound to the length of the rectangleThe proportion of people infected b ...

Why use anti shake and throttling? Take a chestnut eight: html: No throttling and anti chattering <input type="text" name="" id="normal"> js: window.onload=function(){ // Impersonate ajax requests function ajax(content){ console.log('ajax request'+content); } let iptnormal=document.getElementById('no ...

Compare the scope of the var and let keywords When a variable is declared with the var keyword, it is declared globally. If it is declared inside a function, it is declared locally. The let keyword behaves similarly, but has some additional functionality. When you use the let keyword to declare a variable in a code block, statement, or expres ...

preface In the process of Web project development, the file upload function is almost essential. Many times, when we upload files, especially when we open the file upload function to ordinary users, we generally need to limit the format of uploaded files to prevent bad users and hackers from uploading virus script files to the server, Common f ...

Definition of function (Declaration of function) grammar function Function name(Parameter 1,Parameter 2,...){ //The statement that the function will execute }//This is called a function declaration //It can also be written like this var f = function(Parameter 1,...){...}//This is also called function expression. //In this way, f is the f ...

32 handwritten JS to consolidate your JS Foundation (high frequency interview) As a front-end development, JS is the top priority. Recently, the peak of the interview has been ended. Basically, the offer has been decided. Wait for the lottery. Take this time to summarize 32 handwritten JS questions. These are high-frequency interview questions ...

Webpack is a technology that many front-end workers will contact. It has no doubt about the effect of code optimization, but its complex operation is undoubtedly very troublesome for Xiaobai who is new to the front-end. Today, let's talk about the introduction and use of the basis of webpack. Basic concepts webpack is a static module packer f ...

brief introductionIn large applications, some components may not be displayed at the beginning and will only be rendered under specific conditions. In this case, the resources of the component do not need to be loaded at the beginning, and can be requested when necessary. This can also reduce the resource volume loaded on the page for the first ...

let and const of ES6 series Occurrence of block level scope Variables declared through var have the characteristics of variable promotion: if (condition) { var value = 1; } console.log(value); Beginners may think that value can be created only when condition is true. If condition is false, the result should be an error. However, due to ...