php this、self、parent区别
1、this是指向当前对象的指针如：同class里面的其他函数可以用 this->函数名 调用。2、self是指向当前类的指针一般self使用来指向类中的静态变量，还要注意使用self来调用静态变量必须使用:: (域运算符号)如：self::$firstCount; //使用self来调用静态变量3、parent是指向父类的指针一般我们使用parent来调用父类的构造函数如：parent::__construct( "PBPHome"); //使用parent调用了父类的构造函数
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Why NameResolutionError(self.host, self, e) from e and how to solve it
Mar 01, 2024 pm 01:20 PM
The reason for the error is NameResolutionError(self.host,self,e)frome, which is an exception type in the urllib3 library. The reason for this error is that DNS resolution failed, that is, the host name or IP address attempted to be resolved cannot be found. This may be caused by the entered URL address being incorrect or the DNS server being temporarily unavailable. How to solve this error There may be several ways to solve this error: Check whether the entered URL address is correct and make sure it is accessible Make sure the DNS server is available, you can try using the "ping" command on the command line to test whether the DNS server is available Try accessing the website using the IP address instead of the hostname if behind a proxy
How to use self in Python
May 17, 2023 pm 10:40 PM
Before introducing the usage of self in Python, let’s first introduce the classes and instances in Python. We know that the most important concepts of object-oriented are classes and instances. Classes are abstract templates, such as abstract things like students. , can be represented by a Student class. Instances are specific "objects" created based on classes. Each object inherits the same methods from the class, but its data may be different. 1. Take the Student class as an example. In Python, the class is defined as follows: classStudent(object):pass(Object) indicates which class the class inherits from. The Object class is all
How to access parent class properties in Python?
Aug 26, 2023 am 10:17 AM
Inobject-orientedprogramming,inheritanceallowsustocreatenewclassesthatinheritthepropertiesandmethodsofanexistingclass.Thispowerfulconceptenablescodereuse,modularity,andextensibilityinourprograms.Beforedivingintoaccessingparentclassattributes,let'shav
An article that understands this point and catches up with 70% of front-end people
Sep 06, 2022 pm 05:03 PM
A colleague got stuck due to a bug pointed by this. Vue2’s this pointing problem caused an arrow function to be used, resulting in the inability to get the corresponding props. He didn't know it when I introduced it to him, and then I deliberately looked at the front-end communication group. So far, at least 70% of front-end programmers still don't understand it. Today I will share with you this link. If everything is wrong If you haven’t learned it yet, please give me a big mouth.
Let's talk about why Vue2 can access properties in various options through this
Dec 08, 2022 pm 08:22 PM
This article will help you interpret the vue source code and introduce why you can use this to access properties in various options in Vue2. I hope it will be helpful to everyone!
How to use this method in Java
Apr 18, 2023 pm 01:58 PM
1. this keyword 1. Type of this: Which object is called is the reference type of that object 2. Usage summary 1. this.data;//Access attribute 2. this.func();//Access method 3.this( );//Call other constructors in this class 3. Explanation of usage 1.this.data is used in member methods. Let us see what will happen if this is not added classMyDate{publicintyear;publicintmonth;publicintday; publicvoidsetDate(intyear,intmonth,intday){ye
What is this? An in-depth analysis of this in JavaScript
Aug 04, 2022 pm 05:02 PM
What is this? The following article will introduce you to this in JavaScript, and talk about the differences between this in different calling methods of functions. I hope it will be helpful to you!
Clever way to use this keyword in jQuery
Feb 25, 2024 pm 04:09 PM
Flexible use of this keyword in jQuery In jQuery, the this keyword is a very important and flexible concept. It is used to refer to the DOM element currently being manipulated. By rationally using this keyword, we can easily operate elements on the page and achieve various interactive effects and functions. This article will combine specific code examples to introduce the flexible use of this keyword in jQuery. Simple this example First, let's look at a simple this example. Suppose we have a
