JavaScript

The running mechanism of JavaScript and Event Loop 1. JavaScript is a single thread One of the main features of JavaScript language is single-threaded, that is, one thing at a time. To take advantage of the computational power of multi-core CPUs,

closure of a function: a function that has access to a variable in another function scope. Common way: Create another function inside one function. function Createcomparisonfunction (propertuname) {return function (object1,object2) { var

Execute function after JavaScript page load completes in HTML When you do a project, you may experience this situation:A catalog file (menu.jsp) is import into a JSP page, and the OnLoad event is defined in for each page. Then this definition of

At present, there are two kinds of standard JavaScript modules: Commonjs and AMD. AMD is mainly introduced here, but will start from Commonjs. One, Commonjs 2009, American programmer Ryan Dahl created the Node.js project, which uses JavaScript

/** * Extension to Date, String * months (m), days (d), hours (h), minutes (m), seconds (s), quarter (q) can be used with 1-2 placeholders, * year (y) can be used with 1-4 placeholders, and milliseconds (s) may only be used with 1 placeholders (1 -3

Create a canvas artboardProject Link: GitHubProject preview: Github PagesProject Description: Create a canvas artboard with basic functionality (including painting, eraser, save, etc.) through the tutorials and APIs provided with MDN.In the course

We often use code such as Javascript:void (0), so what does javascript:void (0) mean in JavaScript?The key in Javascript:void (0) is the Void keyword, which is a very important keyword in JavaScript, which specifies that an expression is evaluated

1.forEach (): No return value, just call func for each elementIn simple terms, each value in the array is traversed sequentially, executing the function functionIf you only need to operate on an array element, you do not need to return any values

IntroductionInheritance is a very important concept in object-oriented languages, and many object-oriented languages support two ways of inheriting: interface inheritance and implementation inheritance. An interface inheritance system inherits only

Methods to get elementsWhoever is to be manipulated must first obtain whom;Get element 1, document.getElementById: Get element by ID name compatibility: Under IE8, the name attribute is acquired by default as an ID; document: documentation;

Shallow copy and deep copy for complex reference type data such as Object, arraySimply put: A shallow copy replicates only one layer of properties, while a deep copy recursively replicates all levels of attributesOne, shallow copy 1 function

JS Code Volume World FirstWrite a lot of itemsMobile Client Android iOS various gadgetsThe domain of the Web page does not do the programming languageJava==================================As with CSS, the introduction of files cannot be opened by

Remember three months ago, learned the quick sort, the example of the Python quick sort is very easy to understand, but the e-learning of the C # of the rapid sequencing at that time, it has been completely forgotten, and probably remember a train

2018-08-04 Preface this question when doing the project today, how to change the login link to the user name after the user login is successfulSolution: OnLoad Load event with Sessionstorage cache and JSAfter the user has successfully logged in, use

First, scopeAlmost all languages have the concept of scope, simply put, scopes are the accessible scope of variables and functions, that is, scope controls the visibility and life cycle of variables and functions.In JavaScript, the engine, compiler,

Bug phenomenon: Figure IFigure I, Code analysisSnake.prototype.move=function(food,map) {//the head moves first, Switch( This. Direction) { Case"Right": This. body[0].x +=1; Break; Case"Left":

* Simple application of an object pool tool tipTootip.htmltool tip 　　Js/tooltip.jsvar tooltipfactory = (function () { var tooltippool = []; return { create:function () { if (tooltippool.length = = = 0) { var

When I recently re-learned JavaScript and watched a dynamic prototype object, I printed two objects that were generated using the same constructor, but the results were different, see the code:var box1=new box (); Console.log (box1)var box2=new

DOCTYPE HTML>HTMLLang= "en">Head> MetaCharSet= "UTF-8"> title>title>Head>Body>inputtype= "button"value= "button"ID= "BT"/>inputtype= "button"value= "Unbind event"ID= "BT2"/>Scriptsrc= "Common.js">Script>Script> //// How to bind events in

Some basic conceptsWhen you create a new property on an object, the Configurable,writeable,enumerable default value on the property is true,value default undefinedFalse when creating a new property with Obejct.defineproperty ()_year The preceding