JavaScript

One, native JavaScript pictures lazy loading1. How to use, e.g.// picture address to bind 2. Introduce the following native JavaScript code in the pagevarLazy = { "IMG":NULL, "GetY":function(b) {varA = 0; if(b && b.offsetparent)

First, water first, using JavaScript to achieve a simple drag. Mainly want to summarize through the form of demoeventThe object properties. First look at this demo to achieve the final result:The main properties involved are: MouseEvent.clientX ,

In JavaScript, a function is actually an object, each function is an instance of a function class, and since it has its own properties and methods, the function name is actually a pointer to a function object and is not bound to a

Method 1:var object name =new object ();Object name. property name = value; Add a property to an objectThe name of the object. Property name =function () {} to add a method to thevar box=new boject ();Box.name= "Li";box.age=18; Numbers without

This article adheres to the You do not understand is you SB, I write the code will be very cool Concept to introduce some of JS's loading skills.The following tips, after three, are carefully used in the team project (mainly

One, use of the switch branch statement:Common methods for 1,switch statements:　　　1Let number = 25;2 3 Switch(number) {4 CaseNumber :5Alert (10);6 Break;7 CaseNumber > 20:8Alert (20);9 Break;Ten default: OneAlert ('

Introduction Method: Write directly in HTML (learn) Write to the file to introduce declaring variables How to assign variable values Assigning a single variable to a value Variable assignment of

What is AOP?The main function of AOP (aspect-oriented programming) is to pull out functions unrelated to the core business logic modules, which are usually related to business logic, such as log statistics, security control, exception handling, and

Basic types and reference typesThe ECMAScript variable may contain values for two different data types: The base data type value and the reference type value.The basic data types are: Undefined,null,boolean,number and string Five.The reference type

The so-called code, when you casually name a variable: var name = "Ukerxi"; is a code, but when your code is written, for the subsequent maintenance and reading of the person, you can see whether the code, easy to read, easy to understand, elegant

AddEventListener Event Method One, the event function call syntax:Element.addeventlistener (event, function, usecapture) Parameters Describe Event Have to. A string that specifies the event name.Note: do not

Previous wordsThe concept of function currying currying was first invented by Russian mathematician Moses Schönfinkel, and then by the famous mathematical logic biologist Haskell curry its enrichment and development, currying from this name. This

The open page automatically pops up when the box is closed set cookie lifetime to refresh the page again to determine if the cookie is invalid lightbox example Click here to open the window X 　　JavaScript only pops up once the box is

var x=0; f (); Console.log (x); var f=function() { X=1; } f (); Console.log (x); function F () { x=2; } f (); Console.log (x); Answer: 2 1 1JavaScript scope, intrinsic function is higher than parameter

1.4 Boolean TypeLiteral value: True, FalseYou can call the Boolean () function on a value of any data type, and always return a Boolean value. Data type The value converted to true Value converted to False

Address: https://www.cnblogs.com/xxxxBW/p/4914567.htmlBind method, as the name implies, is the meaning of binding, in the end how to bind then how to use it, the following is to say I understand this method.GrammarFun.bind (This,arg1,arg2,...)The

Introduction to web Front-end engineers and introduction to web engineers This article is intended for beginners who want to get started with the web Front-end project. If you are an expert, please pass by. You are also welcome to make a

The absolute and relative elements set the difference in percentage width and height, absoluterelative Generally, the space occupied by elements on the page includes magin border padding content. Previously, the percentage width and height of a

How does react-navigation determine whether a user logs on to the logon page, This article describes how to use react-navigation to determine whether a user is logged on to the logon page, share the information with you, and take notes for yourself,

Difference between new Array () and var arr = [] in javascript, arrayarr In learning javascript, you may not know how to distinguish Array functions new Array () from var arr = []. Let's take a look at the summary below. Var arr = [] This is a way