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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
Talk about the application of html web table table structured labeling

Before talking about the structured mark of the web form, you should first read a few pictures. The structured and so -called structured of the HTML table is as shown in the above -mentioned first pair of graphs, which is to divide our tables into three t

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
Problems with HTML form elements overriding style elements and their remedies

In the process of designing HTML pages, we often encounter problems caused by form elements covering style elements. Figure 1 is a typical example. Don't underestimate this seemingly "low-level" problem. Similar problems are not uncommon eve

2025-02-03
CSS: Customize colorful web link underlines

CSS itself does not directly provide the function of changing the underline of HTML links, but as long as we use some techniques, we can still make the monotonous underline of web links become colorful. 1. Basic principles First of all, the first step to

2025-02-03
Websocket in HTML5 implements live broadcast function

For video live streaming, I studied many solutions in the early stage, including websocket. Due to various reasons, I did not adopt this solution in the end, but I still want to record my learning experience. WebSocket is a protocol for full-duplex commun

2025-02-03
WeChat browser back button interception function in the upper left corner

In the development of WeChat public accounts, sometimes it is necessary to intercept and process the page logic related to the return button in the upper left corner of the browser, instead of letting the page directly return to the previous page. This de

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
[HTML5] 3D model-Erhang code implementation rotation stereo cube instance

Recently, the gameplay of Rubik's cube suddenly wanted to write a Miku's model with HMTL5. Since the Rubik's Cube is a 3D cube, this time I tried to write a simple 3D model with HTML5. The following is a preview screen. First of all, you need

2025-02-03
The use of local hiddenfield in Form in Extjs4

Copy the code as follows: Ext.onReady(function(){ Ext.QuickTips.init(); Ext.create("Ext.form.Panel",{ title:'Local hiddenfield instance', renderTo:

2025-02-03

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