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The role and difference description of the role and call method in JavaScript

1. Explanation of Call and Apply 1. Call, Apply belongs to a method for functions.prototype. It is implemented in the JavaScript engine because it belongs to the function.prototype, so each Function object instance (that is, each method (that is, each met

2025-02-09
Shared drawing board function implemented by socket.io and canvas

At first, I just wanted to write a simple drawing board. Later, I unconsciously remembered that graphite documents have a whiteboard function, so I wanted to develop the current canvas function into a simplified version of the collaborative drawing board.

2025-02-09
The difference between append and appendTo and the usage of appendChild

append() is preceded by the object to be selected, followed by the element content to be inserted into the object. appendTo() is preceded by the element content to be inserted and is a Jquery object, and followed by the object instance to be selected: $(&

2025-02-09
JS to add a solution to the page to add style to the page

I encountered a problem when I did a project today. My A.JSP introduced B.JSP, C.JSP also introduced B.JSP, and the style in B.JSP is based on different dynamic changes introduced (in A.JSP , Write JS change in C.JSP). I found a lot of code on the Interne

2025-02-09
Several good ways to define functions by js function

4 ways to define functions by js function 1. The most basic method is used as a function declaration. The code copy is as follows: The code copy is as follows: function func(){} or var func=function(){}; 2. Use as a class constructor:

2025-02-09
Are you really using HTML5 semantic elements correctly?

HTML5 Semantic Elements Semantics is the study of the meaning of words and phrases in language. Semantic element = element that has meaning. The semantic element clearly describes what it means to browsers and developers. Examples of non-semantic elements

2025-02-09
Use JavaScript to disable all text boxes, drop-down menus, and multi-line text fields on the web page

The principle is to loop through the controls on the web page, and then set the disabled attribute to true. The code is as follows: Copy the code and the code is as follows: <script type="text/javascript">var nodeList = document.getElementsByTa

2025-02-09
Mobile tablet and other mobile terminals adapt to js of URL JS code

Copy code code as follows: <script type="text/javascript">if(/AppleWebKit.*mobile/i.test(navigator.userAgent) || (/MIDP|SymbianOS|NOKIA|SA

2025-02-09
A brief analysis of the defects of for in in js

The for in statement is used to list the properties (members) of an object. Copy the code as follows: var obj = { name: "jack", getName: function() { return this.name}}; // Output name, getName for ( var

2025-02-08
Document.execcommand () usage summary

The first thing to explain is that it is not well supported under Firefox. 2D-POSITION allows objects that move absolute positioning by dragging movement. AbsOluteposition sets the POSITION attribute of the element as "absolute" (absolutely). Ba

2025-02-08
JS judging whether characters are two ways of Chinese characters

Sometimes it is necessary to determine whether a character is a Chinese character. For example, when the user enters the content containing Chinese and English, you need to judge whether it exceeds the prescribed length. There are usually two methods to j

2025-02-08
Click to show the method to hide other peer elements

The code copy is as follows:

2025-02-08
Sample code for drawing emoticons on canvas

This article introduces the sample code for drawing emoticons on canvas and shares it with everyone. The details are as follows: Drawing cartoon smiling faces var canvas = document.getElementById(canvas); var context = canvas.getContext(2d);

2025-02-08
Javascript implements a small example of returning to the previous page and refreshing it

Today I wrote a small page that prompts success. It also requires returning to the previous page and refreshing the operations on the previous page (such as deletion and addition). I searched it online and found that basically 90% of the results are corre

2025-02-08
Detailed explanation of Android and HTML hybrid development summary

Many APPs now have HTML5 pages embedded in them, such as those that change frequently. Some pages require native Java to interact with js in HTML5. Here is an introduction to the use of HTML5 in Android: 1. About HTML5 cookie web pages Many parameters suc

2025-02-08

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