JavaScript

Transferred from: http://blog.csdn.net/yiluoak_47/article/details/7766760First, the difference between null and undefined:Executes typeof on declared but uninitialized and undeclared variables, returning "undefined".Null represents an empty object

To create the syntax for the number object:var myNum = new number (value);var myNum = number (value);When number () and operator new are used as constructors, it returns a newly created number object. If you do not use the new operator to call

Prototype in JavaScript has not been very understanding, today after reading the "Advanced JavaScript Programming" finally understand the prototype. To simply summarize what you learned from the book.We all know that after creating a function, this

Method One:For the extension of Date, convert date to a specified format of string//months (m), days (d), hours (h), minutes (m), seconds (s), quarter (q) can use 1-2 placeholders,//year (Y) can use 1-4 placeholders, milliseconds (s) only 1

"Form1"runat="Server"> "Gvreue"runat="Server"autogeneratecolumns="False"DataSourceID="SqlDataSource1"> "ProductName"> "Txtqty"runat="Server"tooltip=''Onblur="calculation (this.value)"> &L t;/columns>

Math.random (): Returns any number between 0-1, excluding 0 and 1;Math.floor (num): Returns an integer less than or equal to num, equal to four rounding, not five in; Example: Math.floor (1.0); Math.floor (1.5); Math.floor (1.9); return 1;Math.Round

These two days in a regular expression with a slightly more complex things, but different browser differences can waste me a lot of ginseng.Now I put the regular expression in the five major mainstream browsers (IE, Firefox, Chrome, Safari, Opera,

Look at Uncle Tom's "Do you really understand JavaScript?" ", there are 5 of questions, I have done it all, and then run it in Chrome's console, although only the wrong one, but still carefully read the next answer, in this summary, to see if we

Here's a collection of some great JavaScript libraries and plugins for making web scrolling animations. Some of them can help you to add dynamic element animations while scrolling through the page, and others to implement the most popular

The JavaScript date function consists of the following 20 functions: (1) getDate function: Returns the day portion of the date with a value of 1~31. Cases: function Datedemo () {var d, s = "Today ' s date is:";　　　　 D = new Date ();　　　　 s + = (

Personal understanding of typed data is the memory allocation area, the storage of different data is the view DataViewvar buffers = [];var json = {"id": +, "name": "China"};var buf = new Buffer (json.stringify (JSON));Define a Arraybuffervar ab =

Jquery text box loses focus to get the value of the current text box and the value of the hidden field My js level is a little poor. It took 3 minutes to get the focus of a text box and the value of the corresponding hidden domain. Hi .. I would

Clear the content in the Panel when ExtJs closes the Panel When using ExtJs to write front-end code, some controls need to be set to hide when they are closed for future use, however, if the user closes the information after entering the information,

JavaScript closure learning notesClosure is a difficult and characteristic of JavaScript language. Many advanced applications rely on closures for implementation. The following are my study notes, which are useful for beginners of JavaScript. 1. To

Understanding of javascript scopes and scopesThe JavaScript scope is the accessible range of variables and functions. 1. The variable scope is in JavaScript, and the variable scope is divided into global scope and local scope. Variables with global

ExtJS: Export Grid data to an excel instance Export function ExportExcel () Var config = {store: alldataStore, title: 'test title'}; var tab = tabPanel. getActiveTab (); // The PanelExportExcel (tab, config) of the current active state; // call the

Introduction to builder mode of JavaScript design mode and javascript Design Mode Builder mode description 1. The construction of a complex object is separated from its representation so that the same creation process can have different

JS and design pattern ------ Strategy pattern StrategyI. general summary 1. I talk about the policy mode, also known as the algorithm cluster mode, which defines different algorithms and can replace them with each other, this mode makes the

Examples of jQuery callback function definition and usage This document describes the definition and usage of jQuery callback functions. Share it with you for your reference. The specific analysis is as follows: In jQuery code, callback functions

Css compatible with small triangles and css compatible with triangles   untitled document December 17   Effect: