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Javascript tutorial

Detailed explanation of Javascript variable scope

The scope of a variable refers to the visibility of the variable, while the life cycle (survival period) examines the variable from another perspective. The scope of variables in JS is divided into global variables and local variables. Those defined withi

2025-02-04
JS formatting amount can choose whether to bring thousands of points and retain accuracy

JS formatting amount, whether you can bring a thousand points, you can choose to retain the accuracy, which is also found online, but the use of the code code is as follows: /* Format the value of the values. @Param Num value (Number or String ) @Param Ce

2025-02-03
JavaScript automatically add links to the text URL address to share

The implementation of the URL address automatically adds that is actually the content: detection and replacement. The detection "detection" is to detect whether the text (string) has the content that meets the HTTP address. Obviously, this requi

2025-02-03
Introduction to the use of parseInt() method of global objects in JavaScript

Copy the code code as follows:<html><head><title> parseInt() method of global object</title><script> /* parseInt() 函数可解析一个字符串，并返回一个整数。 1、解析字符串，直到不能解析为止 2、

2025-02-03
js method to get html page node (recursive method)

It's been a long time since I've done a recursive call. After reading it, I suddenly woke up! Copy the code code as follows:

2025-02-03
JS modify the attribute use introduction introduction

Properties and methods that can be accessed by all instances that can be accessed in JavaScript in JavaScript. In many cases, it is necessary to re -assign the attributes in the prototype. I have a novice struggle like me), the following is a simple to do

2025-02-03
A brief analysis of the differences between offsetLeft, Left and clientLeft

Assume that obj is an HTML control. Obj.offsetTop refers to the calculated upper position of obj relative to the layout or the parent coordinate specified by the offsetParent attribute, integer, unit pixel. obj.offsetLeft refers to obj relative to the lay

2025-02-03
A brief overview of scope and context usage in javascript

Scope and context in JavaScript are unique to the language, thanks in part to the flexibility they bring. Each function has different variable context and scope. These concepts underlie some powerful design patterns in JavaScript. However, this also bring

2025-02-03
Summary of three methods for defining and initializing js two-dimensional arrays

Method 1: Directly define and initialize. If the number is small, you can use var _TheArray = [["0-1","0-2"],["1-1","1-2"], ["2-1","2-2"]]Method 2: Two-dimensional array of unknown length var tAr

2025-02-03
JS SORT two -dimensional array sorting summary

Recently, the problem of JS sorting is that the database sorting is too consuming resources. If it can be transferred to the client to sort, it can greatly reduce the server memory consumption. In the client, except JS, it is as AS. Unfortunately, I learn

2025-02-03
JS judgment two time sample code

As shown below: Copy code code is as follows: Function Validtime (Starttime, Endtime) {var aRR1 = Starttime.split ("-"); VAR ARR2 = Endtime.Split ("-"); VAR DA

2025-02-03
Summary of usage of substr, substring, indexOf, lastIndexOf in js

Usage of substr, substring, indexOf, lastIndexOf, etc. in js 1. substrsubstr(start, length) means starting from the start position, intercepting a string of length length. var src="images/off_1

2025-02-03
IE7+background transparent text opaque and super simple implementation method

If you are still worried about the incompleteness of the transparent text of the background, I suggest you take a look. Of course, I have given up IE6, so don't say that no PNG8 pictures are not effective under IE6, of course you can also use filters.

2025-02-03
Analysis of the difference between naming when a variable is declared and naming when the variable is used as an object attribute

This title is really a mouthful. The rules followed by Javascript naming variables are 1. The first character must be a letter, Chinese character, underscore (_) or dollar sign ($) 2. The remaining characters can be underscore, Chinese character, dollar s

2025-02-03
Turn off the browser window invalid solution to close the browser window under Firefox and Chrome

First of all, IE can close the browser window through Window.Close (), but it is invalid under Firefox and Chrome. The reason is that the default settings under Firefox cannot be closed by the browser window through the script to prevent malicious script

2025-02-03

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