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Javascript tutorial

js gets and clears the value of input type="file" (sample code)

Upload control (<input type="file"/> ) is used to browse and upload files on the client side. The path selected by the user can be obtained by the value attribute, but the value attribute is read-only and cannot be assigned through javascript, which makes

2025-02-22
JS's hidden parameters (Arguments, Callee, Caller) How to use

Before referring to the above concept, first want to talk about the implicit parameters of the function in the function in JavaScript: Argumentsarguments. [function.] Arguments [n] parameter function: option. Currently executed

2025-02-22
Combined with JQ1.9, a method to determine various browser versions through js regularization

As shown below: $.browser.mozilla = /firefox/.test(navigator.userAgent.toLowerCase()); $.browser.webkit = /webkit/.test(navigator.u

2025-02-22
Dynamically load js, css and other files across iframes

1. Dynamically load js, css file (using native js and jquery) iframe structure: frame0 (parent) frame2 (child) event is triggered in frame3 (child) frame2, dynamically load js, css file and dom elements into frame3? * Can be adjusted between the same leve

2025-02-22
js example code to implement single line text upward scrolling effect

Copy the code as follows:/******************Scroll session starts************************/function ScrollText(content, btnPrevious, btnNext , autoStart) {this.Del

2025-02-22
Introduction to the method of dynamically creating script tags to achieve cross-domain resource access

The code of the login.html copy is as follows: <script>function request(id,url){oScript = document.getElementById(id);var head = document.getElement

2025-02-22
JavaScript Carriage Enter perfectly implements tab switching function

The most recent project is to use chemical factories to input a large amount of data during use, using a small keyboard area. In the past, when data was entered through excel, we need to implement excel-like reply on the web page. The function of car wrap

2025-02-22
JavaScript uses constructors and prototypes to simulate the functions of C# classes

Copy the code as follows: //Constructor function person(name, age) {this.name = name;this.age = age;}//Define the person prototype, and the attributes in the prototype can be referenced by custom objects person.protot

2025-02-21
Example discussion of the default expansion of the RowexPander control in Extjs

Copy the code code as follows: // Expand the Function Expendrow () {var I; // cycling temporary variable var arr = []; //

2025-02-21
JS implements calendar to get the specified date, week number and week number sharing examples (js get the week number)

It should be necessary to have interaction, and Js is chosen to implement it, which can be regarded as a first test of pair programming. I will write the display part in html, and the button clicked trigger event function is check(); copy the code as foll

2025-02-21
Javascript connects multiple arrays without using concat to solve it

The first method is the well-known concat, but there is a certainty of this method that this method will not change the existing array, but will only return a copy of the connected array. If we just want to add elements of a new array to an existing array

2025-02-21
Dynamically load dtree.js treeview (sample code)

Copy the code code as follows: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <h

2025-02-21
JS request value and automatic execution use example

There are three commonly used methods for automatic execution of JS functions in web pages. In the head area in HTML, there are the following functions: Copy the code as follows:<SCRIPT LANGUAGE="JavaScript"> functionn MyAutoRun() { //以下是您的函数的代码，请

2025-02-21
Specific implementation of obtaining non-repeating values from 3 arrays

Copy the code as follows: var a = [ "a" , "b" , "c" ], b = [ "b" , "c" , "d" ], c = [ "c" , "d" , " e" ], _a = a.concat( b ).concat( c ),

2025-02-21
Explanation of Factory Pattern Examples of JavaScript Design Patterns

The original method of javaScript factory method is because the properties of the object can be dynamically defined after the object is created. When JavaScript was first introduced, code similar to the following would be written. Copy the code as follows

2025-02-21

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