object oriented javascript interview questions

Although it is difficult to learn at the beginning, but as long as the understanding, it is very convenient and meaningful to determine. JavaScript also provides this keyword, but it's much more "confusing" than the classic Oo language. Here's a look at what's confusing about how to use all of this in JavaScript? 1, in the HTML element event properties inline way to use the This keyword: Can use this in t

signal! So as to achieve "encapsulation"! Copy Code code as follows: Some people may ask, which model is good? What does this say? Both methods have advantages and disadvantages, combined with the use of Bai! In short, a principle, must not be directly accessed by external objects, the closure of the package. "Must certainly" four words very abstruse, unceasingly practice can realize the true meaning! Inheritance : When we mention this, I would like to add another sent

working principle of the prototype model, you need to understand the nature of the central ECMAScript. Understanding the Prototype In JavaScript, whenever a new function is created, a prototype property is created for the function based on a specific set of rules. By default, although the prototype property automatically obtains a constructor property that contains a pointer to the function of the prototype property, we can continue to add additional

JavaScript is an OOP, and some people say that JavaScript is object-based. 1) how to create an object: 1. Use constructor, for example: Var obj = new Object () // var can be omitted Var obj = new Date () 2. Use object lit

used to invoke a function and can specify this the context, you can let the code use the object you specified, rather than rely on the browser to calculate the this point to what. Call, apply and bind itself is quite complex, should have its own documentation, and we will consider this as part of the future problem to be solved. Here is an this example of how to change the pointer method:View this on JsfiddleEvent delegation and this being an importa

There are several ways to implement inheritance in JavaScript, and here are two common types. One, call inheritance, first look at the code: First define a "people" class Copy Code code as follows: Human Person=function () { This.name= "Grass mud Horse"; This.eat=function () { Alert ("I Want to eat"); } This.sleep=function () { Alert ("I Want to Sleep"); } } Then define a student class and let it inherit fr

= [1,2,3,4];}function Child3 () {parent3.call (this); This.type = ' child3 ';} Child3.prototype = new Parent3 (), var s3 = new Child3 (), var s4 = new Child3 ();disadvantage: The parent's constructor executes two times, but it is not necessary. Fourth: Optimization of combinatorial inheritance 1　　　　　　function Parent4 () {this.name = ' parent4 '; This.play = [1,2,3,4];}function Child4 () {parent4.call (this); This.type = ' child4 ';} Child4.prototype = Parent4.prototype;var S5 = new Child4 (), v

Interface: the interface in the principle program specified for the implementation of a task, function, purpose, and so on: specifies several methods and method names. (Because the tasks to be completed in the program are implemented through functions or methods .) Interface in javascript: compare an "type object" of the instance with the "interface object" of t

configuration. While JavaScript is interpreted to perform without generating intermediate files, "read a sentence, execute a sentence", the execution can generally be done in three ways:1. The general browser comes with the JS interpreter, which can be used directly by the browser;2. Special interpreter software can be installed node. js, executing the. js file;3. Executed with the Web page, using the Third, the data typeJava is a strongly typed lang

Most classes in javascript are represented by function functions, and most of them are defined in json format later. Classes in javascript are represented by function functions, as follows: The Code is as follows: Function Student (){// Define the field in the Student class and grant the initial value. However, the access permission for this field is public.This. studentNo = 's001 ';This. studentName = '

25 JavaScript interview questions you need to know 1. Usetypeof bar === "object"JudgmentbarIs an object having potential drawbacks? How can we avoid such disadvantages? UsetypeofThe disadvantage is obvious.instanceof): let obj = {};let arr = [];console.log(typeof obj === '

If I were to define this: Copy Code code as follows: function GetDate () {...} function GetDate (date) {...} Then the latter method will overwrite the previous one, although no error. But we can really overload it, if you've ever used jquery, you will have a deep understanding, such as $ ("#btn"). Val () is the value of the button that gets the id "BTN", and $ ("#btn"). Val ("Point Me") assigns a value to the button with the id "btn". So how does

JavaScript Interview Requirements: the following questions must be selected from one to four, three questions are implemented using native code, and no framework is available. The fifth question is chosen as the JavaScript Interview