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Detailed explanation of the difference between javascript array traversal for and for in

There are two ways to traverse arrays in js to copy the code code as follows: var array=['a']//Standard for loop for(var i=1;i

2025-06-15
JavaScript event model instance analysis

This article describes the usage of the JavaScript event model. Share it for your reference. The specific analysis is as follows: 1. Bubbling event: The event is passed from the leaf node along the ancestor node to the root node Capturing event: from the

2025-06-15
JS method to continuously flow web page background

This article describes the method of JS to continuously move web page background. Share it for your reference. The specific implementation method is as follows: Copy the code code as follows:<html><head><title> The background of the web page that continue

2025-06-15
Javascript regular expression implementation adds a thousand separator to a number

Recently, I saw an interview (written test) question using js to implement the thousand-digit separator of numbers on the Internet, so I wrote a method that uses "regular + replace" to implement it: the code copy is as follows: var thousandsBitS

2025-06-15
JavaScript implements 3 ways to determine whether the image is loaded and completed

Sometimes in front-end development work, in order to obtain image information, we need to correctly obtain the size and size of the image after the image is loaded, and execute the corresponding callback function to make the image produce a certain displa

2025-06-15
JavaScript converts from image to base64-bit encoding String

Recently, I need to open the WeChat sharing method of the app to the webview, which involves the shared images. If you connect through the transfer of pictures, you will get the image file again in the background, which will affect the speed. I chose webv

2025-06-15
Use pure javascript to achieve magnifying glass effect

JD or Taobao’s specific products have the effect of a magnifying glass. Although there are many similar plug-ins on the Internet, there are many inconveniences when applying them to projects. I took some time to write a similar plug-in and accumulate the

2025-06-15
JavaScript object-oriented shared member attributes and methods and usage of prototype keywords

This article describes the shared member properties and methods of object-oriented JavaScript and the usage of prototype keywords. Share it for your reference. The details are as follows: share member attributes and methods, and use prototype keywords to

2025-06-15
How to open a new window to prevent being blocked by the browser

This article describes how JS opens a new window to prevent it from being blocked by the browser. Share it for your reference. The specific analysis is as follows: using the traditional window.open() method to open a new window will be blocked by the brow

2025-06-15
In JavaScript, count the number of Textarea characters and prompt for the characters that can be entered

The popular Weibo websites such as Twitter have a good user experience, that is, when entering text in the text box, the characters entered will be automatically counted and the characters that users can still enter will be displayed. In Weibo blogs with

2025-06-15
Implementation code for uploading files to display progress in HTML5

Comment: Below we use the new feature file API of Html 5 to upload files and display the percentage of upload files progress. The intention is like this: when selecting a file, display the current file information. Here we combine Asp.net MVC as the serve

2025-06-15
Commonly used pop-up ads and rear projection ad implementation methods in JavaScript

This article describes the commonly used pop-up ads and rear projection ad implementation methods in JavaScript. Share it for your reference. The specific analysis is as follows: Pop-up ads and background ads are used more frequently on large websites, an

2025-06-15
JS click on the link and slowly expand the hidden image

This article describes the method of slowly expanding the hidden image after clicking on the link by JS. Share it for your reference. The specific implementation method is as follows: Copy the code code as follows:<html><title> After JS click on the link,

2025-06-15
Commonly used JavaScript WEB operation methods sharing

Array method set Angela.array = { //# Array method// index, return position! If it does not exist, it returns -1; index: function (t, arr) { //# Returns the position of the array where the current value is located if (arr.inde

2025-06-15
How to get flash version number by javascript

This article describes the method of obtaining the flash version number of JavaScript. Share it for your reference. The specific analysis is as follows: Let's introduce two js functions to determine whether the user has installed flash. If flash is in

2025-06-15

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