ecmascript tutorial

Original article: http://www.nczonline.net/blog/2012/11/06/ecmascript-6-collections-part-3-weakmaps/ WeakMapSimilar to the conventionalMapThey map a value to a unique key, and then they can be used to obtain the corresponding value.WeakMapAndMapThe difference is that its key can only be the object value, not the original value. Although this restriction looks strange, it is exactly this that makesWeakMapIt has become very valuable. OneWeakMapThe obje

It's written in front. In this chapter we talk about several key statements in ECMAScript, such as Switch, for-in, label and so on, deepen our understanding of them. First, from the most common. While and for While and for are common statements, whether in JavaScript or C or in other programming languages. And in programming we are more commonly used for,for is more flexible and simpler, so some people may have such a misunderstanding: For is more

This article describes ECMAScript 6, which is about to bring us new array manipulation methods and how to apply these new array features to existing browsers. Note: I will use the alternating constructor (constructor) and Class (class) two terms. Class methodThe method owned by the array itself. Array.from (Arraylike, Mapfunc, Thisarg?) The basic function of Array.from () is to convert the two types of objects into groups. Class Array Object (Arr

Write in frontIn this chapter we talk about a few key statements in ECMAScript, and so on, to switch for-in label deepen our understanding of them. First of all, from the most common.While and forWhile and for are regular statements, whether in JavaScript or C or other programming languages. And in programming we are more commonly used, it is for for more flexible and easier to use, so some people may have a misunderstanding: forwhilemore pow

Function Type in ECMAScript This article mainly introduces information about function types in ECMAScript. For more information, see The most interesting part of ECMAScript is that the function is actually an object. Each Function is a Function-type instance and has attributes and methods like other reference types. Because the function is an object, the function

Ecmascript 2 (object usage) 1. Scope of objects and variables A. Compared with other object-oriented languages, strictly speaking, ecmascript does not have a static scope. The sub-methods in object methods are the public scope methods of methods, rather than static methods. B. This keyword always points to the object that calls the method. It is best to use this keyword when calling the attributes of this o

Original address: http://www.moye.me/2014/11/10/ecmascript-6-generator/IntroductionOld listen to people say koa Dafa good, these two days I also rushed to fashion: with N to install node 0.11.12, under a KOA Open Harmony mode test water. In the education of a series of documents and posts, it is probably recognized that: KOA is a new generation of web frameworks dominated by TJ God KOA Middleware is based on the ES6 generator function * F

ECMAScript operators. For more information about js learning, see 2.9.5. Addition operators. Addition operators (plus signs and minus signs) are usually the simplest operators. However, in ECMAScript, each addition operator has many special behaviors. 1. Addition operators: The Code is as follows: Var iResult = 1 + 2;Console. log (iResult); // outputs 3 Special features: The number of operations is Na

ECMAScript operator. If you are studying JavaScript, you can check the 2.9 operator. 2.9.1 unary Operators The unary operator has only one parameter, that is, the object or value to be operated. 1. delete: delete references to previously defined object attributes or methods. However, this operator cannot delete undefined attributes and methods. Example: The Code is as follows: Var o = new Object;O. name = "Nicolas ";O. show = function (){Return "t

Brief introductionThere are two special properties in the object defined by ECMAScript, which are given when you define an object's properties, and we can rewrite the two special properties to rationalize the access to their properties when necessary, and the two special properties address and function as follows: Data properties: By setting the properties of the data, we can allow the user to manipulate normal data (Obj.name) to restrict the perm

2.8 reference type 1. Object Class All classes in ecmascript are inherited by the object class. The object class has the following attributes: Constructor: A Reference (pointer) to the function that creates an object. For an object class, this pointer points to the original object () function. Prototype: Reference to the object prototype of the object. There are several methods for the object class: Hasownproperty (property): determines

This article mainly introduces information about function types in ECMAScript. For more information about function types, see ECMAScript, which is the most interesting. I think it is nothing more than a function, it means that the function is actually an object. Each Function is a Function-type instance and has attributes and methods like other reference types. Because the function is an object, the functio

To debug Javascript in A SharePoint environment, consider the following settings:1. First, you need to check whether your IE has enabled script debugging.In Internet Explorer, find "Tools" --> "Internet Options", find the "advanced" page, and find the following two items under this page:Disable script debugging (Internet Explorer)Disable script debugging (other)Make sure these two items are not selected. 2. For the ecmascript Object Model in Shar

Use the ecmascript object model to compileCodePreviously, we certainly wanted our coding process to be as easy as possible, so here let's look at how to implement the smart prompt function when writing code.1. Create a Javascript file in vs2010. 2. Add the following code at the beginning of the file: /// Reference Name = "Microsoftajax. js" /> We must. javascript references are placed on the first line. Javascript has a certain de

2.8 reference type1. Object Class All classes in ECMAScript are inherited by the Object class.The Object class has the following attributes:Constructor: A Reference (pointer) to the function that creates an Object. For an Object class, this pointer points to the original Object () function.Prototype: Reference to the object Prototype of the object.There are several methods for the Object class:HasOwnProperty (property): determines whether an object ha

This article mainly introduces the function type of ECMAScript in the relevant data, the need for friends can refer to the The most interesting thing about ECMAScript, I think, is the function, the interesting source, is that the function is actually an object. Each function is an instance of a function type and has properties and methods as well as other reference types. Because a function is an object, t

In ECMAScript, if you are studying js, You can see 2.7 type conversion. 1. convert to a string All objects can be converted to strings using the toString () method. Note that the toString () method of the Number type has two modes: default mode and base mode, the default toString () method is used to output the corresponding 10-digit numeric value with the corresponding string. Different base numbers can be output in the base mode. Example: The Code

Function Type in ECMAScript, ecmascriptfunction The most interesting part of ECMAScript is that the function is actually an object. Each Function is a Function-type instance and has attributes and methods like other reference types. Because the function is an object, the function name is actually a pointer to the function object and will not be bound to a function. A function is usually defined using the fu

While and forWhile and for are regular statements, whether in JavaScript or C or other programming languages. And in programming we are more commonly used, it is for for more flexible and easier to use, so some people may have a misunderstanding: forwhilemore powerful than anything that can be while done. In fact, we think a little bit about while for The syntax of the sentence, and we'll find: whileLoops that cannot be looped for can not be done. This is because for

1. convert to a string The boolean values, numbers, and string values of ecmascript are pseudo objects, that is, they all have attributes and methods. VaRColor = 'Blue'; Alert (color. Length );//Output "4" The three main primitive values, Boolean values, numbers, and strings, all have the tostring () method, which can be converted into strings. The tostring () method of the boolean type only outputs "true" and "false", and the result is determ