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Javascript tutorial

Comprehensive collection of event objects in IE and Firefox browsers

window.event IE: There is a window.event object FF: There is no window.event object. Event objects can be passed as arguments to functions. For example, onmousemove=doMouseMove(event) The current coordinates of the mouse IE: event.

2025-01-17
Two ways to assign values and pass parameters to onclick using js

1) When the method has no parameters, the value can be assigned directly using onclick = method name. Copy the code as follows: window.onload = function() {$('btnTest').onclick = test; }function test() {alert

2025-01-17
JavaScript simulation implements C# String.format function function code

C# string.format function is used in many places, so I implemented a simple version using js: copy the code as follows: String.format = function (){var formatStr = arguments[0];if ( t

2025-01-17
Delete current row, add row with javascript (sample code)

The code to delete rows is as follows:<script> function del(obj) { obj.parentNode.parentNode.removeNode(true); } </script><body><table><tr><td>

2025-01-17
Use js to dynamically add a text box in the foreground and obtain the content of the text box in the background (sample code)

There are two pages in total, as follows: 1. Create the page create.jsp and copy the code as follows: <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

2025-01-17
How to operate custom properties of web controls through javascript

When programming, you sometimes use custom properties of web server controls. For example, there is no IsNotNull property in the TextBox control, but we can add an IsNotNull property ourselves to use it as a mark to facilitate our programming. Although, t

2025-01-17
JavaScript 32-bit integer unsigned operation example

In JavaScript, all integer variables are signed integers by default. What does this mean? Signed integers use 31 bits to represent the value of the integer, and bit 32 to represent the sign of the integer. 0 represents a positive number, and 1 represents

2025-01-16
js quick sort implementation code

However, there are many books that do not explain it very clearly, and different teaching materials have different implementation methods. I will write down the simplest quick sorting idea here for your reference. I hope that no matter what language you u

2025-01-16
Implementation code for cloning an array in Javascript

A JS interview question from a company in 2008. The position was a JavaScript engineer (going to Google). The interviewer asked me how to clone an array. At that time, I thought about it. The Object of js does not have a clone method, but the Object of ja

2025-01-16
A brief analysis of the priority of identifiers with the same name in JavaScript

1. Local variables are used first and then declared, which does not affect the external variables with the same name. The code is as follows: var x = 1; // --> external variable x function fn(){ alert(x); // --> undefined local variable x first uses

2025-01-16
Manuals and specifications

This book is a tutorial. It aims to help you gradually learn the language. But o

2025-01-16
Code editors

A code editor is the place where programmers spend most of their time. There are

2025-01-16
Developer console

Code is prone to errors. You will quite likely make errors… Oh, what am I talking about? You are absolutely going to make errors, at least if you’re a human, not a robot.

2025-01-15
Hello, world!

This part of the tutorial is about core JavaScript, the language itself.

2025-01-14
Code structure

The first thing we’ll study is the building blocks of code. StatementsStatements

2025-01-14

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