JavaScript

The https://juejin.im/post/5a91615f6fb9a0634d27c770 ' + ' operator invokes toprimitive (), except that the object type returns its default value (the calling object's internal method [ [Defaultvlaue]] See 8.12.8), and the rest returns the input

1 javascript variable scopes 1.1 function Scopes There is no block scope: The scope is not surrounded by {} and its scope is determined by the function, so the curly braces in statements such as If/for are not independent scopes. As mentioned above,

There are several ways to encode URL strings in javascript: Escape (), encodeURI (), and encodeURIComponent (). These encodings play a different role. Escape () Method: The specified string is encoded using the ISO Latin character set. All spaces,

Apply, call In JS, call and apply are meant to change the context in which a function is run, in other words, to change the this point within the function body.A big feature of JS is the notion that the context and runtime context and context can

Http://www.jianshu.com/p/1a20dac12cf6 Related knowledge points Data types, operations, objects, function, inheritance, closures, scopes, prototype chains, events, REGEXP, JSON, Ajax, DOM, BOM, memory leaks, Cross-domain, asynchronous loading,

js/javascript Code Annotation specification and Example Note the importance of coding in the process, write code more than half a year can be deeply realized. Code that is not annotated is not good code. For others to learn, at the same time for

In JS, and there is no real sense of the interface, we can only simulate the way the interface effect, use the interface can promote the reuse of code, reduce the coupling between the code, reduce code errors and find the cause of error, the

String objects provide many methods, but few programmers make the most of them, which, for a programmer, cannot be said to be a flaw. Strings provide methods that can be used to manipulate characters, produce HTML tags, search strings, and so on.

Today I'm going to talk about the immediate execution function of JavaScript and the closure problem.First, let's take a look at the immediate execution function: (function () {...}) () and (function () {...} ()) is a common way for two kinds of

JavaScript basic Discipline (4) Code deduction for--UMD Specification 1. UMD specification Address: GITHUB.COM/UMDJS/UMD UMDSpecification, is the most ugly one in all specifications, no one!!! It is designed to allow modules to be compatible AMD and

BOM and dom********JavaScript is divided into Ecmascript,dom,bom. The BOM (Browser object model) refers to the browser's objects models, which make JavaScript capable of "talking" to the browser. The DOM (Document Object model) refers to all the

Putting external JavaScript files behind your browser can increase your browser's loading speedDefer= "defer", wait until the browser has finished loading and execute the script, only valid for external script linkVariables defined with var are

Learn about functions in javascript:MDNNanyi Teacher's TutorialAbout the definition of a function: Nanyi Teacher: A function is a block of code that can be called repeatedly. The function can also accept input parameters, and different

Prototype objects are also not without drawbacks. First, it omits the process of passing initialization parameters to the constructor, resulting in all instances getting the same property value by default. While this will somehow bring some

Introduction: A New day, insist on learning, summary. Yesterday's article looked again today, found that the updated knowledge point is really a little less, today to write more than a line. Then this blog post continues to summarize the knowledge

1. What is console?Console is a separate window used to display JS and DOM object information. And inject a console object to Js.You can output information to the console window.2. What browsers support console?Many people may know that chrome and

Javascript learning summary: 1: declarative functions // Parse the page only once. No matter how the parameter changes, the number of calls: The same function object is used. Syntax: Function functionname (param1,... paramn ){ Function statements; }

1. js array looping. Array loop variables, the first thought of is for (VAR I = 0; I In addition, you can also use a relatively simple foreach method. 2. foreach function. Both the array type of Firefox and chrome have foreach functions. Use: New

Original article: http://www.iamued.com/qianduan/1645.html   The setTimeout and setinterval of JavaScript are two methods that can easily fool others' feelings, because we often think that the call will be executed in the established way. I think

Nowadays, many website advertisements are in full swing. Now I will introduce the common code usage methods for floating couplet advertisements. The results are displayed at a resolution of 1024*768, the image can be automatically hidden at a