Programmer Think

1, What is JSON? JSON is a format for storing and transmitting data.JSON is usually used to transfer data from the server to the web page.JSON refers to JavaScript Object NotationJSON is a lightweight text data exchange formatJSON is language independent: JSON uses Javascript syntax to describe data objects, but JSON is still language and ...

1. Hook introduction Hook is a new feature added in React 16.8.0. You can use state and other React features in function components. ✌️ Hook usage rules: Hook s are JavaScript functions, but there are two additional rules for using them: Hook can only be called on the outermost layer of a function. Do not call in loops, conditional judgemen ...

Why use JQuery? When using native js to obtain tags, it was once very troublesome, and the problem of blank documents should be considered. The method of obtaining tags is very single. It always needs to obtain the target tags through parent nodes and child nodes, and the animation effect of js is weak; JQuery encapsulates js. Many dom operati ...

1. Run js in the page (1)javascript, abbreviated as js, is a functional and weakly typed scripting language. (2) In a web page: HTML is responsible for what is in the page. CSS is responsible for what the page looks like. JS is responsible for what the page can do. JS can control HTML and CSS (3)Js runs in two ways in the page: Wri ...

Convenient and practical technology that can reduce the number of lines of code and speed up the development work! In our daily tasks, we will write functions such as sorting, searching, finding unique values, passing parameters, exchanging values and so on, so here I list my shorthand skills! ✌🏻 JavaScript is really a great language ...

March 30, 2020 Monday # How to restore JSON data after it is transferred to Blob When axios requests to download the file interface, the responseType: 'blob' is generally set. If the file returns normally, there is no problem, but if there is a problem in the background file processing or authentication, the interface returns JSON format data ...

Chapter 3. Scales, Axes and Lines This chapter introduces the processing of various scales, coordinate axes and the use of broken lines. As mentioned at the beginning, a basic problem to consider when drawing visual charts is how to present the actual data values on the page in an appropriate proportion of pixel size and color. D3 has done a ...

catalogue 21. Recursion (1) Case 1: (2) Case 2: 22. Closure (1) Understand 1. How to read the local variables inside the function from the outside? 2. Concept of closure 3. Why do I need closures (2) Closure case 32. Front back separation - data interaction (1) Data interface specification process 1. Interface documents: 1. Underst ...

Browser architectureJavaScript runs in the browser, BOM is the bridge between JavaScript code and browser, and DOM is used to operate various tag elements.BOM includes window, history, location, documentDOM includes Document (whole Document), Element (label Element), CharacterData (character data) and Attr (attribute), which can be further divi ...

What are the pointer functions that change the this pointer inside a function and what are their differences? What are the directions for this? Code Analysis Questions: var name = 'window' var person1 = {   name: 'person1',   show1: function () {     console.log(this.name)   },   show2: () => console.log(this.name),   show3: function () { ...