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Front Hello everyone, I'm here again. Today we'll talk about what is a request interceptor and the role of a request interceptor. Well, I won't say anything superfluous. I'll start today's explanation right away Here we go request interceptor The function of the request interceptor is to: Some operations are performed before the ...

1, What is Ajax?          Asynchronous Javascript + XML (asynchronous JavaScript and XML) is not a new technology in itself, but a 'new' method to describe a collection of existing technologies. 2, How to access background data?          1. Create XMLHttpRequest ...

Prototype and prototype chain Constructor Show Prototype Object===Implicit Prototype Object for Instance Object of Current Constructor A prototype is an object. Its purpose is to provide objects with shared data to other objects. A function object, either by itself or by object name()Way to execute the function. A normal object is an ob ...

1, Use the Gaud weather interface: The URL link is: https://lbs.amap.com/api/webservice/guide/api/weatherinfo (1) Register and get Key When you use, you need to register for Key, because it is Ali's company, you can use Alipay scan code registration. After registration, click apply key on the page shown in the figure: Click "create new ...

JS is an object-oriented programming language. The object-oriented in JS focuses on prototype and prototype chain knowledge. Prototype is the foundation of javascript object-oriented system implementation. Creating objects in javascript is not based on 'classes', but through constructors and prototype chains. JS is based on prototype chain in ...

Front end technology stack HTML hypertext markup language realizes page presentation and forms a static web page CSS cascading style sheets to achieve page beautification JS javascript script language realizes the data interaction between the front end and back end of the page to form a dynamic web page React facebook produces front-end and ...

0. Execution context and execution context stack 0.1 variable promotion and function promotion Variable promotion: this variable can be accessed before the variable definition statementFunction promotion: the function is executed before the function definition statementFirst the variable is promoted, then the function is promoted 0.2 how to ...

1, Introduction vue is a progressive framework for building user interfaces: Build user interface: as the name suggests, it is the framework that can be used to write the interfaceProgressive: you can either transform a small part of a page or build a complex website from scratch The core idea of vue framework is data driven: vue framework ...

1, Introduction to webpack What is webpack webpack is a front-end resource building tool and a static module packer In webpack, all file resources in the front end (js/json/css/img/less) are treated as modules. It will perform static analysis according to the dependency of the module and package the corresponding static resources. ...

Create a new jquery.min.js file in vs (any name here, as long as it is a JS file) Import in html file <script src = "jquery.min.js"></script> 1.2. jQuery entry function 🔥 // The first method is recommended $(function(){ ... // This is the entrance to the completion of page DOM loading }) // The second ...