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Native JS operates the web page to add onclick events to the p element and change the color of the table every other row.

1. Add onclick event to all p elements in the web page: copy the code as follows: <%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><html><head>

2025-01-26
100 Practical JS Custom Functions You Can’t Miss

1. Native JavaScript implements string length interception and copy code as follows: function cutstr(str, len) {var temp;var icount = 0;var patrn = /[^/x00-/xff]/;var strre

2025-01-25
Event altKey,ctrlKey,shiftKey attribute analysis

event.altKey Function: Detect whether the Alt key is pressed when the event occurs. Syntax: event.altKey Value: true | false Description: The altKey attribute is true to indicate that the Alt key was pressed and held when the event occurred, and false to

2025-01-25
Two ways to determine whether the URL is valid in js

Method 1: (only applicable to ie) Copy the code as follows: function CheckStatus(url){XMLHTTP = new ActiveXObject("Microsoft.XMLHTTP")XMLHTTP.open("HEAD",url,f

2025-01-25
How to make HTML elements such as pre and textarea remove the scroll bar, wrap automatically, and adapt the height of the text content

Pre and textarea in HTML can display preformatted text. i.e. preserve spaces and newlines. Instead of having to add and etc. HTML elements to add line breaks and print spaces. When pre removes the scroll bar, pre displays text content and it will not auto

2025-01-25
Return implementation method in Html5 page

When you see this title, you may think what the hell is this? In fact, what I want to say is this, look at the recording below: This kind of interaction is everywhere in H5 pages. Click on the city -> pop up the city selection floating layer -> pres

2025-01-25
Summary of undefined learning in JavaScript

This is the value returned when an undeclared variable is used, a variable that has been declared but not assigned a value is used, or an object property that does not exist is used. Although undefined and null are not the same, the == operator treats the

2025-01-25
Introduction to the meanings of top, parent, and opener of JS window objects

1.top This change always refers to the browser window at the highest level of the split window. If you plan to execute commands from the highest level of the split window, you can use the top variable. 2.openeropener is used to reference the object of the

2025-01-25
Detailed explanation of the attributes and methods of the video tag in Html5

Preface I am writing a custom player recently. Before writing, we must go through all the properties and methods of the player. Only by knowing our enemies and ourselves can we be able to fight through a hundred battles... Later, we will write the player

2025-01-25
A simple example of js reading the number of clicks (reading from the database)

It is to get the total number of clicks every time it is clicked, right? 1. You can drag a hidden button control on the server side, and then write the Click event of the button. The function of this event is to retrieve the total number of clicks from th

2025-01-25
Example of image rotation using html5 Canvas

As we all know, canvas is a bitmap, and you can render what you want in it, but you can only edit it by manipulating the properties of the canvas. That is to say, you cannot manipulate things drawn into the canvas. For example, if I add a painting to the

2025-01-25
A brief analysis of the pitfalls of JavaScript prototypal inheritance

JavaScript uses prototypal inheritance by default. Although there is no concept of a class, its function can act as a constructor. The constructor combined with this and new can build a Java-like class. Therefore, JavaScript can simulate classes by extend

2025-01-25
Implementation code of js running algorithm

Copy it first and see the running effect. The essence used is the setInterval() method: Copy the code and the code is as follows:

2025-01-25
Implementation of basic collision detection for Html5 Canvas animation

To perform collision detection in Canvas, people often directly use the built-in collision detection function of the game engine (Cocos2d-JS, Egret) or physics engine (Box2D). Are you curious, have you ever thought about their internal operating mechanism

2025-01-25
Implementation of HTML5 offline application and client storage

Supporting offline Web application development is another focus of HTML5. The so-called offline web applications are applications that can still run even when the device cannot access the Internet. Developing offline web applications requires several step

2025-01-25

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