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Pure JS implementation selects DOM_javascript techniques based on CSS class
Pure JS implementation selects DOM_javascript techniques based on CSS class
// For reference online, I modified part of it myself
// The code is as follows, pure JS, the browser is required to support the getElementsByClassName method
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How to use classes and methods in Python
Apr 21, 2023 pm 02:28 PM
Concepts and instances of classes and methods Class (Class): used to describe a collection of objects with the same properties and methods. It defines the properties and methods common to every object in the collection. Objects are instances of classes. Method: Function defined in the class. Class construction method __init__(): The class has a special method (construction method) named init(), which is automatically called when the class is instantiated. Instance variables: In the declaration of a class, attributes are represented by variables. Such variables are called instance variables. An instance variable is a variable modified with self. Instantiation: Create an instance of a class, a specific object of the class. Inheritance: that is, a derived class (derivedclass) inherits the base class (baseclass)
Replace the class name of an element using jQuery
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jQuery is a classic JavaScript library that is widely used in web development. It simplifies operations such as handling events, manipulating DOM elements, and performing animations on web pages. When using jQuery, you often encounter situations where you need to replace the class name of an element. This article will introduce some practical methods and specific code examples. 1. Use the removeClass() and addClass() methods jQuery provides the removeClass() method for deletion
What does class mean in python?
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What are the ways to obtain DOM nodes in Vue3
May 11, 2023 pm 04:55 PM
1. Native js gets the DOM node: document.querySelector (selector) document.getElementById (id selector) document.getElementsByClassName (class selector).... 2. Get the instance object of the current component in vue2: because each vue Each component instance contains a $refs object, which stores references to the corresponding DOM elements or components. So by default, the component's $refs point to an empty object. You can first add ref="name" to the component, and then pass this.$refs.
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When writing PHP code, using classes is a very common practice. By using classes, we can encapsulate related functions and data in a single unit, making the code clearer, easier to read, and easier to maintain. This article will introduce the usage of PHPClass in detail and provide specific code examples to help readers better understand how to apply classes to optimize code in actual projects. 1. Create and use classes In PHP, you can use the keyword class to define a class and define properties and methods in the class.
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May 21, 2023 pm 04:01 PM
In web development, DOM (DocumentObjectModel) is a very important concept. It allows developers to easily modify and operate the HTML or XML document of a web page, such as adding, deleting, modifying elements, etc. The built-in DOM operation library in PHP also provides developers with rich functions. This article will introduce the DOM operation guide in PHP, hoping to help everyone. The basic concept of DOM DOM is a cross-platform, language-independent API that can
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Background Recently, key business codes have been encrypted for the company framework to prevent the engineering code from being easily restored through decompilation tools such as jd-gui. The configuration and use of the related obfuscation scheme are relatively complex and there are many problems for the springboot project, so the class files are encrypted and then passed The custom classloder is decrypted and loaded. This solution is not absolutely safe. It only increases the difficulty of decompilation. It prevents gentlemen but not villains. The overall encryption protection flow chart is shown in the figure below. Maven plug-in encryption uses custom maven plug-in to compile. The class file specified is encrypted, and the encrypted class file is copied to the specified path. Here, it is saved to resource/corecla.
What is the reason why ref binding to dom or component fails in vue3 and how to solve it
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Vue3ref binding DOM or component failure reason analysis scenario description In Vue3, it is often used to use ref to bind components or DOM elements. Many times, ref is clearly used to bind related components, but ref binding often fails. Examples of ref binding failure situations The vast majority of cases where ref binding fails is that when the ref is bound to the component, the component has not yet been rendered, so the binding fails. Or the component is not rendered at the beginning and the ref is not bound. When the component starts to render, the ref also starts to be bound, but the binding between ref and the component is not completed. At this time, problems will occur when using component-related methods. The component bound to ref uses v-if, or its parent component uses v-if to cause the page to
