eloquent javascript modern introduction to programming

Asynchronous programming in Javascript is gradually accepted by everyone. Previously, it was generally implemented through callback nesting, setTimeout, setInterval, and other methods. The code looks very inintuitive and difficult to understand without looking at the entire code logic. Asynchronous functions in Javascript include I/O functions (Ajax, postMessage,

(function (Resolve) {resolve (100);}); Promise.then (function (value) {return value * *;}). Then (function (value) {return value * *;}). Then (function (value) {Console.log (value);//= + 100 * 2 * 2});　　Promises Error HandlingThe then () function receives two callback functions as arguments. The function that the second callback function fires when promise becomes rejected. Promise also provides a catch () function to handle the rejected state of promise. Look at the following code:Promise.then

The exclamation is to ease the serious atmosphere and bring out the topic to be discussed today, "javascript object-oriented programming". Next, we will focus on several major object-oriented keywords: encapsulation, inheritance, and polymorphism, expand.Encapsulation: In the mode in which objects are created in javascript, I personally think that the closure is

based on the interface Dom traversal and scope of CSS-applied styles for elements Dom3 Dom load and Savedom validation Payment xml1.0 specification Other DOM standards SVG Scalable Vector GRAPHICSMATHXL mathmatical markup Languagesmil synchronized Multimedia Integration language Bom Only handle browser window and frame 1 popup new browser window 2 move zoom close window 3 provide browser details for navigator object 4 browser loaded page

The questions I wondered in the previous article will be solved in this chapter and in the following chapters. From today on, learning DOM programming has gradually become a beginner JavaScript programmer. And then develop toward the js craftsman. The questions I wondered in the previous article will be solved in this chapter and in the following chapters. From today on, learning DOM

in toy) {Each object has a isprototypeof method that determines whether the current object is a prototype of another object/*every object also gets the isPrototypeOf () method. * This method tells your whether that specific object is used as a prototype of another object. Each object has a isprototypeof method that determines the current object is not another object of prototype* */var monkey = {hair:true,feeds: ' Bananas ', breathes: ' Air '};function Human (name) {this.name = Nam e;} Human.p

What is JavaScript? JavaScript is a scripting language that is widely used in the development of client Web pages (browsers), such as adding dynamic functions to HTML pages, such as responding to users ' various actions. JavaScript is a scripting language that is based on object and event-driven (event driven) and has a secure performance, most of which is perfo

() accepts a configuration object that, in addition to the paths property mentioned previously, has a shim property that is specifically designed to configure incompatible modules. Specifically, each module defines (1) The exports value (the output variable name), indicating the name of the external invocation of the module, and (2) An array of deps that indicates the dependency of the module. For example, the plugin for jquery can be defined like this:Shim: { ' Jquery.scroll ': {deps: [' jquer

JavaScript asynchronous programming is gradually accepted by everyone, previously we generally through callback nesting, settimeout, setinterval, etc., the code looks very intuitive, do not look at the entire code logic is difficult to quickly understand. In JavaScript, asynchronous functions may have I/O functions (Ajax, PostMessage, img load, script load, etc.)

Javascript OOP design Pattern Object-oriented programming When we first wrote the JS code, it was written like this. function CheckName () { //verify name } function Checkemail () { //verify mailbox } function Checkpassword () { //Verify password } This way can cause serious pollution of global variables, and then transition to var checkobject = { checknam