function apply

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

This is the current object that refers to the current Page Object window if you use this in a global scope, and if this is used in a function, this refers to what is invoked on the object based on this function at run time. We can also use apply

The K-Nearest neighbor algorithm is the most basic of the case-based learning methods, and first introduces the related concepts of case-based learning. first, the case-based learning. 1, a series of training examples are known, many learning

I front-end small white, but in the company to do a PC-side program, with angular write, had to self-taught a angular frame. Although in the course of work reluctantly enough, but think that since the use of a little to understand a little more

webpackAs the most fire-front building tool, is the most important part of the front-end automation tool chain, the use of high threshold. This series is the author's own study record, compares the foundation, hoped through the problem + solves the

SELECT * from Tbiz_projectrelationTarget statistics each project has several application recordsStep1SELECTProjectID, Relationids= STUFF((SELECT ',' + CONVERT(VARCHAR,[Relationid]) fromTbiz_projectrelation TWHEREProjectID=T1. ProjectID forXML PATH (

This document is based on the relevant data collated, summarized, mainly on the Oracle database, to obtain the most authoritative and correct method of SQL statement execution plan, and also explained in detail the meaning of the options available

Why do you want to make a div with rounded corners: The div with rounded corners is smooth and beautiful, which has a good effect in some cases. For example, to create a message box for message reporting, it makes sense to dynamically generate a

Same point: Each function contains these two native methods The effect of both of them is the same, for executing functions under a specific scope, essentially setting the value of this object within the function. Different points:

For a long time, the understanding of this in JavaScript is vague, especially for applying and calling functions. If these two operations do not have a good understanding of the concept of this in JavaScript, they will become more and more confused.

In js, the context of this is always unpredictable. In many cases, bugs are always confused. In fact, it is okay to know how to execute it in different situations. Global execution First, let's look at what this is in the global environment: First.

I. Constructor call (with or without return)1. var obj = new Object ();var obj = new Object;The two lines of code are equivalent; expression: New obj.m ();, this is not obj!! The constructor is usually not used with the return keyword;Two. Indirect

This is a keyword of JS, and the value of this will change as the function is used in different situations. But there is always a principle that this refers to the object that invokes the function.Scenario 1: If there is this in a function, but it

　　The concept of JS inheritancejsThe following two ways of inheriting are commonly used:原型链继承（对象间的继承）类式继承（构造函数间的继承）Because js unlike the java real object-oriented language, which is js object-based, it does not have the concept of a class. Therefore,

The following content is translated from StackOverflowLink:Http://stackoverflow.com/questions/7238962/function-apply-not-using-thisarg-parameterIn AS3, method is different from function, which is part of a class and is bound to an instance "that is,

During the NG2 development process, the angular team brought us a new library –zone.js. Zone.js's design is inspired by the Dart language, which describes the context of the JavaScript execution process and can be passed between asynchronous tasks

Read the description of the call and apply method in the JS authoritative guide: we can call () and apply () as a method of an object, calling the function indirectly in the form of a calling method. This explanation is a bit confusing. Here's your

This is an issue with RTTI (runtime type recognition), and C + + has three elements that support Rtti:1. dynamic_cast operatorIf possible, the dynamic_cast operator uses a pointer to the base class to generate a pointer to the derived class,

I. CausePrototype was used that day. javascript is so confused when you open it and check a few lines. The reason is that you are not very familiar with js object-oriented methods, So Baidu + google finally made a small gain, write this to

Introduction to the function of the four call pattern, we first to understand the concept of functions and methods, in fact, functions and methods are essentially the same, that is, the name is not the same. Function: If a function is related to any