eloquent javascript modern introduction to programming

cause bugs and should be avoided as much as possible. The Code is as follows: // 6. B .3 Function Device (opts ){Var self = this; This. value = null; Stream. read (opts. path, function (data ){ Self. value = data; }); SetInterval (function (){ Self. emit ("event "); }, Opts. freq | 100 );} C. Use thisArg Several prototype methods in ES 5.1 have built-in a special thisArg tag and use it as much as possible. The Code is as follows: // 6. C.1 Var obj; Obj = {f: "foo", B: "bar", q: "qux "}; Obj

A Brief Introduction to Javascript functional programming and a brief introduction to javascript For decades, functional programming has always been a hot topic in Computer Science. Due to the purity of mathematics and the mysteri

Introduction to the programming language JavaScript, the programming language javascript What is JavaScript? JavaScript is a scripting language widely used in client web pages (browsers

extension: started to support the XML1.0 specification. 2.3 BOM Object ModelBoth IE and Netscape Navigator support Browser object models (BOMs) that can access and manipulate browser windows, and the BOM is part of the Javascrip implementation until HTML5.BOM only handles browser windows and frames, because there is no BOM standard, although there are de facto standards, such as the Window object and navigator object, but each browser has defined its own properties, with the HTML5, the impleme

located on the same server as the page containing it, or a file in any other domain. All Since the browser resolves the code in the Using the Defer property allows the script to be fully rendered in the document only to be executed again. Deferred scripts are always executed in the order in which they are specified. Use the Async property to indicate that the current script does not have to wait for other scripts or block document rendering. There is no guarantee that asynchro

Introduction to javascript Object-Oriented Programming and Object-Oriented Programming The ECMA-262 defines an object as a collection of unordered properties that can contain basic values, objects, or functions" The simplest way to understand an Object is to create an Object instance and add attributes and methods to i

extensions:A) popup The function of the new browser window;b) The ability to move, zoom, and close the browser window;c) Navigator object that provides browser details;d) A Location object that provides detailed information about the pages loaded by the browser;e) A Screen object that provides detailed information about the user's display resolution;f) support for cookies;g) Custom objects such as the activexobject of XMLHttpRequest and IE.6, BOM no standard can be followed, so each browser has

accessing and manipulating Web page content, and the DOM is for HTML and XML documentsThe API (Application Programming Interface) Dom depicts a hierarchical tree of nodes that allows developers to add, remove, and modify nodes of a page.These nodes also contain different types of data. Dom level, the DOM1 level is mainly the structure of the mapping document, the DOM2 level has new views,Events, styles, traversal, and scopes, the DOM3 scale further e

respective support for DHTML at that time.1.DOM Level1: Contains core (implementing XML Document Mapping), HTML (core-based extensions, objects, methods).2.DOM Level2:core extension to namespace support, add views, Events, Style, Range, and traversal modules.The 3.DOM Level3:core supports XML1.0 (XML Infoset, XML Xpath, XML Base) and adds the load and Save, validation module.Other languages also support SVG, Mathxml, SMIL. IE5 started to support the DOM, but IE5.5 fully supported it, IE6, 7 in

in the DOM1 class are also extended to support XML namespaces.The DOM3 class extends the DOM further, introducing a way to load and save documents in a uniform way-defined in DOM load and save (DOM load and save) modules, and new methods for validating documents-defined in DOM validation (DOM Validation) modules. The DOM3 class also extends the DOM core, starting with the XML 1.0 specification and designing XML Infoset, XPath, and XML Base.3 Browser object Model (BOM)Developers use the BOM to c

For decades, functional programming has been a favorite of computer science enthusiasts, because of the purity of mathematics and the nature of mysteries, which are buried in computer labs, only for data scientists and people who want to get a PhD. But now it is undergoing a revival, thanks to some modern languages such as python,julia,ruby,clojure and-but not the last--

JavaScript Quest: Prototype chain Prototype chain JavaScript Quest: Constructor Constructor JavaScript Quest: Executable Context Stack Execution context One: Variable object and active object Execution context Second: scope chain scope Chains Execution context its three: closure Closures Execution context Its four: this pointer

This article mainly introduces a deep understanding of the JavaScript series (17): An Introduction to object-oriented programming, this article describes the introduction, paradigm and ideas, class-based features and prototype-based, static-based, and hierarchical inheritance. For more information, see

While there are some arguments about the difference between object-oriented JavaScript and other languages, there is no doubt that JavaScript has powerful object-oriented programming capabilitiesThis article starts with introducing object-oriented programming, then reviews the Java