best way to learn javascript for beginners

Closures (closure) are a difficult and unique feature of the JavaScript language, and many advanced applications rely on closure implementations. Another understanding of closures (closure): First of all, I think that a concept, if not understand also does not affect the use of words, then, there is no need to understand it, to learn it. Closures are such a concept that you can use it well without understa

puzzle, like groovy to a DSL. I will record and discuss some of the language features, but will not discuss the likely important but trivial parts of most syntactic sugars. If it's just a pure study note that's boring, it's better to write it as a spit. I fought from Java and JavaScript to Haskell and groovy, and for these four languages, a feature is a feature-by-landscape comparison, such as standing at the angle of the type system, weak type, st

given property in the current object instance, rather than in the prototype of the instance. where the attribute name (PropertyName) as a parameter must be specified as a string (for example: O.hasownproperty ("name"))isPrototypeOf (object)--Used to check if an incoming object is a prototype of another objectpropertyIsEnumerable (PropertyName)--Used to check whether a given property can use the For-in statement to enumerateToString ()--Returns the string representation of an objectValueOf ()--R

Good friends, we've already explained the basics of JavaScript, starting with today's content, and we're going to start talking about encapsulation, and here we have 1.1-point access to OOP (object-oriented programming), and if programmers used as a language don't even know what OOP is, Or just heard that they did not understand, can not write object-oriented code, then there is no need to learn the program

The original author is PeterRybin and a member of the Chrome developer tool team. The original author is Peter Rybin (cl... Synt) and a member of the Chrome developer tool team. In: https://gist.github.com/4158604 In this article, we will use Chrome's Developer Tools to learn two important concepts in JavaScript: "closures" and "Internal Attributes ".Closure The first thing to talk about is closure-one of t

The author is Peter Rybin, a member of the Chrome developer tool team. In: https://gist.github.com/4158604 In this article, we will use Chrome's Developer Tools to learn two important concepts in JavaScript: "closures" and "Internal Attributes ".Closure The first thing to talk about is closure-one of the most famous things in JavaScript. A closure is a function t

Original: Learn JavaScript from the beginning (eight)--variablesFirst, the variable classification:Base type value: null, Undefined, number, string, Boolean;Reference type value: Keep an in-memory object, such as: Object/array/function/date/regexp/error/map/set ...Second, the attributeThe two are defined in a similar way: Create a variable and assign it a value.2

Closures, and I've heard of it when I first touched JavaScript. The first thing to be clear about is that it's not really complicated to understand, and it's very useful. So what's the basis for us to understand the closures? I personally think that the most important is the scope (lexical scope), if the scope and scope of the chain do not understand the best students to learn first, and then back to unders

; }; } }; Console.log (Object.getnamefunc () ()); My Object　　 Two .> anonymous functions Define an anonymous function directly and then call this anonymous function, which is common in the definition of jquery plug-ins 1. By the way of the letter quantity of the function. Declare an anonymous function first, and then execute it (function () { console.log (' excute self '); }) (); 2. By

is called (that is, this in the method), and the last is the parameter list required by the method.We know that in Java the This keyword represents the current object, we cannot modify it, and the function is called directly in JavaScript, just like a Java function call, which represents the current object.If you want to modify this, you can use apply this way.Aobj. afunction ("1");Aobj.afunction.apply (bobj,["1"]);The first

understand the = = in JavaScript? 　　6. Iterative methodEvery (), filter (): Returns an array that matches the condition, which is useful when you want to filter items that meet certain criteria. foreach (), map (): Returns an array of specific processing, some ().1 var New Array (1, 2, 3, 4, 5, ten); 2 var newarray = Num.filter (function(item, index, array) {return item > 2;}); 3 alert (NewArray); // 3, 4, 5, tenOver. If you feel good, please help me

I wrote an article yesterday to learn javascript (1) Through jQuery source code. There is a method for defining Object C in it. I didn't pay too much attention to the technical details in the early days. Later, I checked the information and found that there were many clever places in it. Today I will share with you the clever 1: Functions Functions are a rare talent in

, debug JavaScript and view variable values by hitting breakpoints. There are several concepts that can be understood first: breakpoints, stepping in, stepping over, stepping out. Here is the unknown. This is mainly the use of setting breakpoints, one step into the way. You can click the set breakpoint at the left row mark, and the right key to the breakpoint can be judged. You can set multiple breakpoi

This article mainly introduces nine ways to create objects to help you better learn javascript object-oriented, interested friends can refer to this article to share nine ways to create javascript objects for your reference. The specific content is as follows: [1] constructing functions using objects[Disadvantage] using the same interface to create many objects

asked, we just need this kind of research spirit, then, JavaScript language did not let us down, he really has such a circulation body, that is do...while; let's look at the grammar first. do{ //execution }while (condition) Here is the first execution of the contents of the loop body, and then to determine whether the condition is set up, if the condition is set up, then cycle the previous content execution Below we take life inspira

traversalPrevious.next = Current.next;//the prev of the current osition element points to the next element of the current postion elementCurrent.next.prev = previous;//In short, over a} length--; returncurrent.element; } Else { return NULL; } }; This. GetLength =function () {returnlength; }; This. toString =function () {varCurrent =Head; var string="'; while(current) {string+=','+current.element; Current=Current.next; } return string; }; }Don

Original: Learn JavaScript from the beginning (ix)--Execution environment and scopeThe execution environment: Defines the other data that variables or functions have access to, and determines their respective behavior. Each execution environment has a variable object associated with it.Variable object: Holds variables and functions defined in the environment.Scope chain: Ensures an orderly access to all var

Hello, friends. Today we will go on to the previous content, we have talked about inheritance, today we say OOP is the last embodiment, that is polymorphic, because JavaScript language flexibility, so we are no way to use the interface, so this also gives JS program has brought some confusion, You don't have to worry too much about this. Because these to the later version of the ECMAScript will solve these

)--Used to check if an incoming object is a prototype of another objectpropertyIsEnumerable (PropertyName)--Used to check whether a given property can use the For-in statement to enumerateToString ()--Returns the string representation of an objectValueOf ()--Returns the string, numeric, or Boolean representation of the object. Usually the same as the return value of the ToString () method.Third, small testtypeof (NaN)typeof (Infinity)typeof (NULL)typeof (undefined)A lot of interviews will ask th

This article is Jin Xu-liang teacher NetEase Cloud Class of course notes, record down, for memo.Overview Using object literals, or adding new members dynamically to an empty object, is the easiest way to create an object. However, in addition to these two commonly used object creation methods, JavaScript also provides other ways to create objects. 1). Create an object using the factory fun