JavaScript

see a person in stack overflow answer, as follows //constructor FunctionfunctionMyClass () {varprivatevariable;//Private member only available within the constructor FN This. Privilegedmethod =function() {//It can access private members //.. };

The prototype chain structure of ordinary objects is described earlier, the properties and methods in the prototype object are introduced, then the prototype chain of the function object is introduced, and the prototype chain is finally

1. The scope chain of JavaScriptFirst look at the following code:Observe the alert (rain); this code. JavaScript first looks in the inner function to see if the variable rain is defined, and if defined, uses the rain variable in the inner function,

Click the div to toggle the color code as follows:DOCTYPE HTML>HTMLLang= "en">Head> MetaCharSet= "UTF-8"> title>Documenttitle>style>. Test1{width:100px;Height:100px;Background-color:Green; }style>Scripttype= "Text/javascript">

Knowledge of the past always forget, encountered code and can not understand. You need to review it and record it.1 Add (+); 2 function Add (b) {3 alert (A +b); 4 }The code can output 3, why is it not executed sequentially? Should

IntroductionLet's first look at a common example,Func() {for (ten; i++) {SetTimeout (function () {Console.log (i)}, +)}}func () The result of the output is not our expected 0-9, but the output of 10 10. And when we var change let it, the result

Elevation is a mechanism that moves the declaration of variables and functions to the top of the function scope (or global scope if not within any function).Ascension affects the life cycle of a variable, and the life cycle of a variable consists of

TipIn JS, this context is always unpredictable, many times the bug is always confused, in fact, as long as the difference between the different circumstances of how to execute on OK.Global executionFirst, let's look at what it is in the global

var arr = new Array (6)Arr[0] = "A planned amount of balance";ARR[1] = "Plan B to issue";ARR[2] = "1 plan amount";ARR[3] = "strong";ARR[4] = "Purchase Multiples";ARR[5] = "program received";ARR[6] = "net demand";Arr[7] = "gross demand";ARR[8] =

JavaScript's in-depth understanding of JS closures (closure) is a difficult and unique feature of the JavaScript language, and many advanced applications rely on closures.The scope of a variableTo understand closures, you must first understand the

Definition and usageThe GetClass () function returns a Javaobject javaclass.GrammarGetClass (Javaobj) The parameter description javaobj a Javaobject object.return valueThe Javaclass object of the Javaobj.DescriptionThe function

Specific requirements:1. Automatically from Samsara images every 2 seconds after page load2. When the mouse hovers or clicks the small picture of the page, the big picture automatically follows the switch, and stops the carousel3. When the mouse

The collection is a bit exaggerated, because it's just a part of it.This is some of the common JavaScript code snippets I've collected in my spare time.However, the organization of the code is confusing, mainly through the global function and object

JAVAScriptThere are three parts, ECMAScript DOM and BOM , depending on the browser, the specific forms of expression are also different. Let's talk today about the differences between the DOM and the BOM.In terms of the encyclopedia:1. Dom is the

var obj={width:100,height:200}, which is not called JSON, and JSON is just a data format, not a concrete instance.But many people think of such a JS object as JSON, the following to clarify the problemFirst, JSON What is it? ( What is the

Anonymous functions:Description: An anonymous function is a function that has no name, and a closure is a function that accesses variables in a function scope. normal function UserInfo (name) {return Name}alert (userInfo (' Li Full

First, AOP (aspect-oriented programming)Function.prototype.before=function(beforefn) {var_self= This;//keep a reference to the original function return function() {//returns the "proxy" function that contains the original function and the new

Original: 1190000000415572Defined: With the length property, other attributes (indexes) are non-negative integers (all of the objects are treated as strings, which you can understand as a non-negative integer String) Does not have a

CSS understanding of padding -- non-original, csspadding -- original I watched Zhang's video on MOOC and learned something to share with you. Video address The Code is as follows: padding for CSS comprehension Code demo address

The Bootstrap time selector datetimepicker and daterangepicker use instance parsing, and datetimepickerrange In bootstrap, there are two time selectors: dateTimePicker and dateRangePicker.   1. dateTimePicker seems to be the official