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Bole Online column Author-Chokcoco If you have a good article to submit, please click here to learn more If you want to reprint, send "reprint" Two words to view the description This article is really difficult to write, because there are numerous articles on the Internet.Coincidence is a few days ago to see the teacher Ruan an article of a sentence:"For me, blogging is primarily a knowledge management tool, followed by a communication tool. My technical articles are mainly used to

I hope that through this article, I can clearly improve the understanding of apply, call, bind, and list some of their magical effects to deepen memory. Apply, call In JavaScript, call and apply are meant to change the context in which a function is run, in other words, to change the direction of this inside the function body. One of the big features of JavaSc

JavaScript provides application and call two invocation methods to determine the direction of this in the function body, which is characterized by the way in which objects can ' borrow ' other objects.Some of the previous blogs reviewed some of the Web control development methods, and we talked about how to implement a custom combo box, as well as a relatively complex address control development, starting with the previous one, beginning with the topic of the JavaScript language itself, recallin

Apply, callIn JavaScript, call and apply are meant to change the context in which a function is run, in other words, to change the direction of this within the function body.A major feature of JavaScript is the notion that a function has a "context of definition" and a "runtime context" and a "context can be changed."First, a chestnut:function fruits () {} = { "red", function() { Console.log

In the JavaScript this keyword detailed article, we talked about the following to make a simple review:The meaning of a 1.this object is to point to properties and methods in the current object.The variability of the 2.this point. This points to the global when the global scope is used, and this points to the object when you use this in an object, and this points to the next object when you assign an object's method to another object.3.this is used in a global environment, used in constructors,

When we use Scala, we often use the object's apply method and the Update method.Although we are not aware of the surface, but in fact two methods will follow the relevant conventions are called.ApplyThe Convention of the Apply method: When you pass a parenthesis to one or more arguments to a variable (object), it is converted to a call to the Apply method.Let's l

Call apply and bind methods in javascript, applybind In JavaScript, call, apply, and bind are the three methods that come with the Function object. In this article, three methods are described in detail through the application of several scenarios. Call () The call () method calls a function or method when a specified this value and several specified parameter values are used. When calling a function, you c

Js Apply Method Specific explanationI started to see JavaScript function apply and call, very vague, see also do not understand, recently on the Internet to see some articles on the Apply method and call some examples of demonstration, finally is a bit of a look at, here I do such as the following notes, I hope to share with you. If there is anything wrong or the

Source of the 1.call/apply/bind method　　First, when using the Call,apply,bind method, it is necessary to know where these three methods come from. Why is it possible to use these three methods?Call,apply,bind these three methods are actually inherited from the Function.prototype, belong to the instance method.1 console.log (Function.prototype.hasOwnProperty (

The commit and apply methods in SharedPreferences, Preferences: ParametersSharedPreferences: Shared Parameters 1. Get the SharedPreferences object In the context classThe getSharedPreferences method can obtain a SharedPreferences object. private File makeFilename(File base, String name) { if (name.indexOf(File.separatorChar) The essence is to create a new File if the File does not exist. 2. commit Method Source code comment: /** * Commit

I saw in the beginning of the JavaScript function apply and call, very vague, see also do not understand, recently saw some articles on the Web on the Apply method and some examples of call, finally is a bit of a look, here I do the following notes, I hope to share with you. If there is something wrong or unclear, I would like to ask readers to make a lot of suggestions in order to improve together.Mainly I

Apply and call. They are used to bind the function to another object for running. The two are different only when defining parameters:Function. prototype. apply (thisArg, argArray );Function. prototype. call (thisArg [, arg1 [, arg2…]);From the function prototype, we can see that the first parameter is named thisArg, that is, the this pointer inside all functions will be assigned thisArg, this achieves the

In JavaScript, call and apply are meant to change the context in which a function is run, in other words, to change the direction of this within the function body.Let's start with an example:function="Red"function() {console.log (this. Color );}} var New //My color is redBut if we have an object banana= {color: "Yellow"}, we don't want to redefine it say method, then we can use call or apply with Apple's s

In SQL Server 2005 or later versions, the APPLY table operation is added, which greatly facilitates our daily queries. 　　The new APPLY table operator applies the right table expression to each row in the left table expression. Unlike JOIN, it can calculate the table expression first. APPLY must calculate the left expression logically first. The logic order of inp

Python is a very concise, elegant language, many of its built-in functions combined, you can use a small number of code to achieve a lot of complex functions, if the same function to let C/c++/java to implement, it may be a big head, in fact, Python is a complex data structure hidden in the built-in functions , in C, so just write your own business logic Python will automatically come up with the results you want. The built-in functions in this area are mainly, filter,map,reduce,

SQL has two forms of apply: crossapply and outerapplyapply. first look at the Syntax: left_table_expression {cross | outer} applyright_table_expression. Then let's take a look at the two steps involved in the apply operation: a1: right table expression (right _ SQL has two forms of cross apply and outer apply: cross

This article is really difficult to write, because there are numerous articles on the Internet.Coincidence is a few days ago to see the teacher Ruan an article of a sentence:"For me, blogging is primarily a knowledge management tool, followed by a communication tool. My technical articles are mainly used to sort out the knowledge I don't know. I write only those things that I have not mastered fully, those I am proficient in, often have no motive to write. Showing off is never my motive, curiosi

The new APPLY table operator applies the right table expression to each row in the left table expression. Unlike JOIN, it can calculate the table expression first. APPLY must calculate the left expression logically first. The logic order of input calculation allows the right expression to be associated with the left table expression. APPLY has two forms: outer

Basically I'm going to solve a few questions: 1. What is the difference between apply and call? 2. Other ingenious uses of apply (in general, under what circumstances can apply) I first looked at the definition of apply and call from the Internet, and then I used an example to explain the meaning of the two methods

Understand $ apply (), $ digest (), and angulardigest in Angular. $ Apply () and $ digest () are two core concepts in AngularJS, but sometimes they are confusing. To understand how AngularJS works, you must first understand how $ apply () and $ digest () work. This article aims to explain what $ apply () and $ digest (