JavaScript Capture web page cancel Close event

During Web development, we often use the page Close event onbeforeunload to give users a chance to stop the event, such as this blog editor. If you choose to exit, the onunload Event will naturally be triggered. But if you choose to cancel, how can

JavaScript variable scope

The variable scope is the region in the program that defines this variable.First, paste a piece of code. If you are not confused about the output of the code, you do not need to read it below./* Code 1 */Var scope = "global ";Function checkScope

Transition event changes in YUI3.3.0

In the transition module of YUI3.2.0, other operations are performed after the transition is completed by using the transition: end event. In YUI3.3.0, this event type is no longer recommended. The following two methods are adopted: First, directly

Do you really know window. location?

If you know a little about JS Code, you will generally knowwindow.location.hrefThis attribute. Use this property to obtain the URL of the page: window.location.href = window.location.href; Okay, I tell you, it's so weak. In fact, native JavaScript

Examples of JavaScript for/in loop usage

Examples of JavaScript for/in loop usage, although For and IN are not used to, but each has its own advantages and personality. It is a good code when used. for/in loop test the for/in loop

JS implementation webpage opens the "Sort favorites" dialog box

Javascript displays "Sort favorites" on the webpage. This function has security risks, so it cannot be implemented in higher IE versions. Click the link on the webpage to display the "organize favorites" dialog box, which is similar to the "add

9 JavaScript development best practices

1. Use the correct however, in the source code, the following tag syntax is everywhere: in HTML, the language attribute is out of date because it is redundant when the type attribute is available. Don't write this again ......In fact, the client

Regular Expression to verify string Composition

Regular Expression to verify string Composition

The Image object of JS can be used to check whether the Image type is valid.

If you encounter an upload of an image file in the project, you need to add a detection program in the background to determine whether the image type is valid to prevent unauthorized file uploads, if you are familiar with js Image objects, you can

IE onchange event-triggered bug and solution tutorial

Today I encountered a bug in the Internet Explorer onchange event. This bug exists in all Internet Explorer versions (6, 7, 8). I don't know if it's a bug, or did I design it like this on purpose? Let's take a look at the reproduction process of the

Multiple frames of GIF in IE can trigger multiple Image (). load events.

Yesterday, my colleague was in charge of a homepage advertisement. The advertisement used multi-frame GIF animation, jpg in the HTML demonstration page, and the Image object load event was used to add the advertisement, this avoids the embarrassing

JavaScript Lesson 2: Operator Operators

Lesson 2 operator Operators (This article is long and smelly, but it is extremely easy to understand. It is only suitable for beginners of JavaScript, especially those with no foundation) 2.0 ASCII and Unicode encoding The computer can only process

Two types of AJAX Chinese garbled Issues and Solutions

1) the parameters in the sending path are in Chinese, and the received parameter values in the server segment are garbled.For example:Var url = "a. jsp? Name = Xiao Li ";XmlHTTP. open ("post", url, true );Solution:Use the escape () or encodeURI ()

Use the YUI3 IO component to implement ajax

Note: The following statement does not support cross-origin ajax, and does not support cross-origin of subdomains./** * */YUI (). use ("io", function (Y ){Var show_info = Y. one ('# show_info ');Var handleSuccess = function (ioId, o ){If (o.

JavaScript Event Learning Addendum: addEventSimple

Here is an addEventSimple and removeEventSimple function. Sometimes I use these two functions to register an event handler that is less conspicuous. Function addEventSimple (obj, evt, fn ){If (obj. addEventListener)Obj. addEventListener (evt, fn,

Select the JS method of the tree data node of the TreeView Control

A few days ago, in order to improve the tree-based permission selection function, jquery was used to write a method based on the tree structure. The result of this method is: "When a node is selected, the selected status of its child nodes also

Introduction and simple use of JavaScript objects

JavaScript is an Object Oriented Programming (OOP) language.JS is an object-oriented programming language (Object-Oriented ).An OOP language allows you to define your own objects and make your own variable types.The OOP language allows you to

Use JavaScript to change the radio and checkbox styles in input.

With the advancement and development of front-end technology, traditional form styles are no longer able to meet requirements. Due to beautiful requirements, many such form beautification plug-ins are available on the Internet. I searched the

Javascript filters all content outside the img tag

The Helper House (www.bkjia.com) tutorial today asked a netizen In the webmaster technical exchange group of bkjia.com, how to use JS to filter all content except the IMG label, in fact, using regular expressions is a good implementation, next we

Inheritance Mechanism of Javascript framework

This is a part of the larger architecture of the Helper House (www.bkjia.com) tutorial. Prototype's original inheritance mechanism was very weak, and this aspect was also strengthened to confront mootools. Well, there is basically a clone function

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