javascript round to 2 decimal

This is the note I have read about DOM programming art, and I understand JavaScript and javascript authoritative guide 5. I am not qualified and cannot write Advanced articles. If you think the notes are not well written, you can leave it alone. This article is a waste of minutes. Javascript: First Javascript Basics

JavaScript stage summary (2): javascript stage summary Previously, I have summarized the concept, development, and basic language of JavaScript and mastered some basic usage. JavaScript videos basically describe details, and we also need to have a global understanding to dee

external Js, You need to refresh it to execute] As shown in this example, when performing a string operation, the result will always be a New String object instead of a modified version of the string. I don't know what you 've seen > Here is a section about value transfer and address transfer. To put it bluntly, it is a reference. If you are interested, you can check it out. JavaScript is a language that maintains a series of references to other

without:var x1=34.00; // use a decimal point to write var x2=34; // do not use the decimal point to write2.2.3 BooleanBoolean can have only two values: TRUE or false:var x=truevar y=false2.2.4 ArrayCreate an array named Boys:var boys=NewArray(); boys[0]= "Tom"; boys[1]= "Jack"; boys[2]= "Alex";You can also do this:var boys=NewArray("Tom", "Jack", "A

Javascript achieves image carousel effect (2) control of Image Sequence nodes and javascript nodes Recommended: Jquery code for image carousel (1) In the previous article, we introduced how Javascript achieves image carousel (I) to beat the image. Here we implement the jump of the Image Sequence node. while redirecting

Summarize:1. Long connection mechanism--distinguish Websocket,http2,sse:HTTP/2 introduced server Push technology to allow the server to proactively send data to the client cache. However, it does not allow data to be sent directly to the client program itself. Server-side pushes can only be handled by the browser and cannot be processed in the program code, meaning that the program code does not have APIs that can be used to get notifications for thes

Array advanced programming practices in JavaScript-2. Advanced javascript programming Let's take a look at the new APIs of arrays in the EcmaScript5 specification. They are very useful, After introducing this part, we will use the Array object to construct a class similar to the ArrayList class in Java, This allows you to encapsulate common logic and reuse code.

What is the "closure" of JavaScript? (2) javascript The title of my previous blog is incorrect, causing some misunderstandings. I think the purpose of a blog is not to back up textbooks, but to share the R D experience. The title of my previous article should be changed to"JavaScriptA topic of closure: it applies to outer scopeImpact", Because I did not strictly

A function is an event-driven or reusable code block that is executed when it is called. This article introduces functions in javascript (2 ), if you are interested in javascript Functions, learn about them. functions are event-driven or reusable code blocks executed when they are called. JavaScript function syntax A

A function is an event-driven or reusable code block that is executed when it is called. This article introduces functions in javascript (2 ), if you are interested in javascript functions, learn about them. functions are event-driven or reusable code blocks executed when they are called. JavaScript function syntax A

An object is a composite data type.The simplest way to create an object is your Javascript Code Contains the Direct Volume of objects. You can also create an object by using the new operator.VaR empty ={}; // an object with no propertiesVaR point = {X: 0, Y: 0 };VaR Circle = {X: Point. X, Y: Point. Y + 1, radius: 2 };VaR Homer = {"Name": "Homer Simpson ","Age": 34,"Married": True,"Occupation": "plant operat

Javascript drag application instance (2), javascript Application Instance You can often see a drag-and-drop verification on the registration page of another website, that is, its verification code is not displayed at the beginning, but a drag-and-drop entry, you have to drag the drag-and-drop string to the end, and the verification code will come out. You still d

Summary of common JavaScript scripts (2) and summary of javascript scripts Convert a pseudo array in JavaScript to a true Array In JavaScript, The Hidden variable arguments in the function and the Element Set (NodeList) obtained using getElementsByTagName are not real arrays

1. Javascript Chinese and variables are case-sensitive. 2. There are no special differences between single quotes and double quotes in Javascript. They can be used to create strings. But as a general rule, most developers prefer to use single quotes instead of double quotes, but the XHTML specification requires that all attribute values must be... syntaxHighlight

prototype.Let's take a look at the code. Here, I refer to a piece of code in "Return of the Javascript King: The Code is as follows: Function Point (dimension){This. dimension = dimension;This. Test = function (){Alert ("Success ");}}Function Point2D (x, y){This. x = x;This. y = y;}Point2D. prototype = new Point (2 );Var p = new Point2D (3, 4 );P. Test (); Test passed. It indicates that Point2D has inh

Basic concepts of JavaScript (2) --- variables and basic concepts of javascriptVariable 1. variable definition Use var in Javascript to define variables. The specific format is as follows: Var name = 1; If only the variables are declared and the variables are not initialized, the value of the variable is undefined. (For details about undefined, see section 3 of t

declaration, but it is not assigned, so the print is undefined.Closed PackageNow that you understand the scope of the function, you can understand the closure. The sum of "functions" and "variables that can be accessed inside a function" (also called the environment) is a closure. For example, the picture above:The function fn1 plus the variable x in the scope of the function fn that he can access is a closure.A more detailed explanation of closures, you can look at the Hungfang t

This article mainly introduces the data structure and algorithm in JavaScript (2): queue is a linear table that allows only one end to be inserted and the other to be deleted, A queue is a data structure of First-In-First-Out (FIFO). If you need a queue, you can refer to the queue to only allow insertion at one end, in another linear table for deletion, the queue is a data structure of First-In-First-Out (F

JavaScript knowledge notes (2) -- events and javascript notesEvent: JavaScript creates a dynamic page. Events are behaviors that can be detected by JavaScript. Each element in the web page can generate events that can trigger JavaScript