ecmascript tutorial

ECMA-262 describes a set of operators that manipulate data values, including arithmetic operators, bitwise operators, relational operators, and equality operators.The difference between the ECMAScript operators is that they can be applied to many values, such as strings, numeric values, Boolean values, and even objects.When these operators are applied to an object, the corresponding operator typically invokes the valueof () and/or toString () methods

argument is an initial value passed to the functionvar A=[1,2,3,4,5]var sum=a.reduce (function (x, y) {return x+y},0)//array sum is 1+2+3+4+5var product=a.reduce (function (x, y) { return x*y},1)//Array quadrature 1*2*3*4*5var max=a.reduce (function (x, y) {return (x>y)? X:y})//ask for maximum valueReduceright () works the same way as reduce (), where it processes data from high to low, not from low to high, according to the array index.5, IndexOf and LastIndexOf ()IndexOf () and LastIndexOf ()

I. Overview The RegExp object represents a regular expression, which is a powerful tool for performing pattern matching on strings. A regular expression is a search pattern formed by a sequence of characters. When you search for data in text, you can use the search pattern to describe what you want to query. A regular expression can be a simple character, or a more complex pattern. Regular expressions can be used for all text search and text substitution operations.

"Everything is Object" knows this in object-oriented programming languages, but it's a feeling for me, sensed it's hard to say. Because I am on JavaScript and weak, so look at the ASP.net Ajax class library at the same time also turned out ECMAScript by the way learn. All classes in. NET inherit from object, as well as in JS, so that if an object is extended, all descendants of the object class must have ancestry. Now that I'm learning JavaScript, I'

1. JavaScript componentsWhile JavaScript and ECMAScript are often used to express the same meaning, JavaScript has a much larger meaning than what is stated in the ECMA-262 standard. A complete JavaScript should consist of the following three different parts Core (ECMAScript); ECMAScript is a script programming language that is standardized by the E

ECMA International approved the seventh edition of the ECMAScript Language specification (ECMAScript 2016). ECMAScript is a standardized JavaScript language, with the first edition released in 1997 and the second and third editions released in 1998 and 1999. After ECMAScript for many years, it was not until after Ajax

This article mainly shares with you some ECMAScript primitive values and reference values of knowledge, the need for friends can refer to First, the concept of primitive values and reference values in ECMAScript, a variable can have two types of values, the original value and the reference value . 1.1 Original value (1) The original value refers to the value of the original type , also calle

Original article: Are yourMixins ecmascript 5 compatible? Author: Nicholas C. zakas YourIs Mixin compatible with ecmascript 5? Translator: justjavac I haven't updated my blog for a long time. Today I saw this blog in nczonline, So I translated it as soon as possible. The level of English is limited. You can refer to the following text: Ecmascript 5, which I recen

Directory: JavaScript (1)-ecmascript JavaScript (2)-ecmascript I strongly recommend my jquery. Ajax series articles to you. Click to view them. Reference: Do you really know JavaScript? Many people regard it as a younger brother with imperfect functions and non-standard syntaxes in object-oriented languages such as Java, and even have no worries about it. Today, more and more programmers are engaged in

Bitwise operators operate at the bottom of a number (that is, 32 digits of a number.Repeat Integers Ecmascript integers are of two types: signed integers (positive and negative values are allowed) and unsigned integers (only positive numbers are allowed ). In ecmascript, All integers are signed integers by default. What does this mean? A signed integer uses 31 bits to represent the value of an integer, 32nd

Bitwise operators operate at the bottom of a number (that is, 32 digits of a number.Repeat Integers Ecmascript integers are of two types: signed integers (positive and negative values are allowed) and unsigned integers (only positive numbers are allowed ). In ecmascript, All integers are signed integers by default. What does this mean? A signed integer uses 31 bits to represent the value of an integer, 32nd

Ecmascript 6 and spread OperatorExpand operator. Converts an array to a continuous parameter. Ecmascript 6 and rest parameterVariable parameters. Process variable objective function parameters. Ecmascript 6 and object literal property value shorthandAbbreviated object literal attribute value. The property value has the same name as the property identifier.

1. The prototype property of an object can be seen as a prototype on which to create a new object. = = = In my understanding, that is, the field set under prototype is unique, shared, no matter how many objects are created, the space is constant, there is no increase or decrease, pointing pointers are pointing to the original place.Tutorial: http://www.w3school.com.cn/js/pro_js_object_defining.asp1 functionCar (scolor,idoors,impg) {2 This. color =Scolor;3 This. Doors =idoors;4 This. mpg

ECMAScript is a neutral language that is neutral in that it is not related to the environment (host environment) (client/server/browser), it is just a language in pure sense.ECMAscript-262 defines the basis of the language, or rules (such as the language syntax, what the underlying type is, how the type is transformed, the behavior of the variable, the function behavior), as if an interface is defined.How to implement these rules is the host environme

Introduction to Strict Mode in ECMAScript 5 This article mainly introduces the Strict Mode of ECMAScript 5. This article describes how to enable the Strict Mode and how it affects variables, attributes, functions, and with statements after the Strict Mode is enabled, for more information, see Strict Mode is a new feature of ECMAScript 5. It allows you to place

ECMAScript, officially named ECMA 262 and ISO/IEC 16262, is the international Web standard for scripting languages in the hosting environment.The ECMASCRIPT specification defines what a scripting language implementation should contain, but because it is extensible, its implementation can vary significantly from the minimum set. ECMAScript is an open, internatio

ECMAScript 5, which I recently worked with clients, needs to be fully utilized. I encountered a very interesting problem here. This problem stems from a very common pattern: mixin, that is, adding the attribute or method of an object to the other in JavaScript. Most mixin functions look like this: Copy codeThe Code is as follows:Function mixin (receiver, supplier ){For (var property in supplier ){If (supplier. hasOwnProperty (property )){Receiver [pro

a file with the following code:GULP.SRC ("Src/**/*.js"). Pipe (Gulp.dest ("dist")); Read all JS under SRC, write to dist directoryEach operation of the gulp returns a Stream object, and all operations are performed in memory without the need to manipulate the disk, which greatly increases the build speed.8.3.2 Preprocessing tasksIn the previous section, the installation, configuration, and definition and execution of the grunt task are described in gulp. This section describes compiling

ECMAScript has five primitive types (primitivetype): Undefined, Null, Boolean, Number, and String. ECMAScript provides typeof to determine the value type 2.6 Original Type ECMAScript has five primitive types: Undefined, Null, Boolean, Number, and String. ECMAScript provides typeof to determine the value type. 1. type

ArticleDirectory Inheritance Method Object impersonating can implement multi-Inheritance Implementation of Inheritance Mechanism To use ecmascript to implement the Inheritance Mechanism, you can start with the base class to be inherited. All classes defined by developers can be used as base classes. For security reasons, the local class and host class cannot be used as the base class, which prevents public access to compiled browser-l