JavaScript

The mountain cannot be boarded, not because of physical strength, but because of a grain of shoes. The same is true for learning. Therefore, it is necessary to learn the details of JavaScript that are common and different from other languages.

A previously unknown concept-closure emerged in JavaScript. What is a closure? On the surface, it is a closed package, which is related to the scope. So, let's talk about the scope before the closure. GLOBAL SCOPE Local Scope Scope chain Execution

Onunload and onbeforeunload are called during refresh or shutdown. You can use window in the & lt; script & gt; script. onunload to specify or specify Onunload in & lt; body & gt;. onbeforeunload is called during refresh or shutdown. You can use

In jquery, the attr () method is used to obtain and set element attributes. attr is the abbreviation of attribute. attr () and attr () are often used in jQueryDOM operations () there are 4 Expressions 1. attr (attribute name) // obtain the attribute

In the project, when the customer closes the pop-up window, if the red X or cancel button is clicked, the message "confirm to save the current operation" is displayed, otherwise, I won't be prompted to write this in the pop-up window. The Code

Introduction to the String type of javascript learning notes. Here we will introduce common functions of js String processing. 1. Character Methods: charAt (), charCodeAt (), fromCharCode () The Code is as follows: Var stringValue = "hello world "

Javascript learning notes some basic concepts of js. If you are studying javascript, refer to the 1. typeof OPERATOR: used to detect the Data Type of a given variable. The Code is as follows: Var message = "some string ";Alert (typeof message); //

Introduction to the Array type of javascript learning notes. For more information, see create an Array. First: The Code is as follows: Var colors = new Array ();Var colors = new Array (20); // create an Array containing 20 itemsVar colors = new

Sometimes you need to allow users to upload multiple files on the page. The number of files is determined by the user. You can delete the files if the number is too large. jQuery can easily implement this function. The Code is as follows:

JQuery flop or shutter effect (Automatic Content Switching in three seconds), so that the list content is no longer boring core code: The Code is as follows: $ (Function (){Var timer = true; // execute the upward or downward SwitchVar liindex =

On the Internet, you will often see some very long web pages that will delay loading images. I think this is a pay-as-you-go approach. The web pages only load the images after those who want to continue browsing the Web pages, while minimizing

Uploadify is a simple and practical flash Upload Component with good compatibility. Now html5 version official address: http://www.uploadify.com/ Offered by: http://www.jb51.net/jiaoben/21484.html Official English documents:

The non-blocking method in NodeJs is introduced. If you need it, refer to the following. First, we use NodeJs to build a basic server. Index. js The Code is as follows: Var requestHandler = require ("./requestHandler ");Var server = require

I was surprised to see kuibono's article in the garden saying that JQuery will not automatically recycle the xmlHttpRequest object and will create a new xmlHttpRequest object after each Ajax request, I simply wrote a program for verification. As

Use Javascript to export data to the function code of the external Excel document. For more information, see The Code is as follows: Function AutomateExcel (){Try {// Start Excel and get Application object.Var oXL;Try{OXL = new ActiveXObject

The drop-down prompt layer of the jQuery-based input box allows you to easily enter the prompt information in your mailbox. For more information, see Code Section The Code is as follows: // JavaScript Document(Function ($ ){$. Fn. extend

. Hover (func1, func2) is equivalent to: mouseenter (), mouseleave () Because hover is not a standard event, you cannot directly use live for processing, so use the following method instead, the effect is the same. The Code is as follows: $

The company's projects have this requirement. After learning mootools in this period, they wrote the functions as the mootools plug-in. I personally feel that mootools has a better plug-in code than jquery in this respect. The Code is as follows:

Chosen is a JavaScript plug-in that can make the ugly and long select box look better and more convenient. Currently, it supports jQuery and Prototype JavaScript Engines. Chosen plugin http://www.jb51.net/jiaoben/38027.html The Code is as follows:

The main principle is the principle of fast sorting: Find the benchmark, create two Arrays for storage, and recursive core code: The Code is as follows: Function quickSort (arr ){// If the array has only one number, it will be returned