JavaScript

functionCheckimgtype (input) {varThis_ = Document.getelementsbyname (' imgfile ') [0]; varfilepath =This_.value; varExtstart = Filepath.lastindexof (".")); varext =filepath.substring (Extstart, Filepath.length). toUpperCase (); if(Ext! = ". PNG "&&

On the internet very much is saying "javascript everything is Object", then this "everything" is actually "everything", or an imaginary number? Also have read the article on the net, some three paper no donkey, is to copy the concept, some also just

Mind Map tips: Mind map, also known as Mind Map, is an effective graphical thinking tool to express the emission thinking, it is simple but extremely effective, is a revolutionary thinking tool. Mind map of the use of text and graphics skills, the

Design patterns can be understood as a series of code frameworks, which I think primarily involves encapsulation concepts. The code snippet that realizes a certain function is encapsulated in the function, it can be conveniently called, at the same

PrefaceToday, JavaScript has become the core of Web page editing. Especially in the past few years, the Internet has witnessed the emergence of a large number of JS libraries in the areas of spa development, graphics processing, and interaction.If

First, the origin of JavaScriptJavaScript is a web technology, originally named LiveScript, which is a scripting language developed by Netscape to extend the functionality of basic HTML to replace complex CGI programs to process Web page form

Original source: http://www.cnblogs.com/justany/archive/2012/11/01/the_keyword_this_in_javascript.htmlQuizTake a look at the code below, what is the last alert?1 var name = "Bob"; 2 var nameobj ={ 3 Name: "Tom", 4 showname:function () {

Learn JavaScript closures (Closure)NanyiDate: August 30, 2009Closures (closure) are a difficult and unique feature of the JavaScript language, and many advanced applications rely on closures.Here is my study note, which should be useful for

There is no concept of class in JavaScript, so it differs from object-oriented language in object creation. The object in JS can be defined as a collection of unordered attributes. Its properties can contain basic values, objects, and

The first thing to say is that the point of this is not deterministic at the time of the function definition, and only when the function is executed can you determine who the this is pointing to, and in fact this is the object that called it (some

Escape (),  encodeuri (), and encodeURIComponent () are the three common methods used in JavaScript to encode strings, but their similarities and differences have plagued many JavaScript beginners, I'm here today to analyze and compare these three

In the world of extensible JavaScript, assuming we say that an application is modular (modular), it usually means that it is composed of a series of highly decoupled, different functional fragments stored in the module.In case of possible. Through a

JavaScript gets the current timestamp:The first method:var timestamp = date.parse (new Date ());Results: 1280977330000The second method:var timestamp = (new Date ()). ValueOf ();Results: 1280977330748The above code gets the number of milliseconds

A reference type is a data structure, also known as an object definition, similar to the concept of a class.The object is an instance of a reference type.JavaScript reference types are: Object, Array, Date, REGEXP, FunctionDeclare an instance of a

Closures, is an important concept in JavaScript, for beginners, closures are a particularly abstract concept, especially the ECMA specification to the definition, if there is no actual combat experience, you can not understand it from the definition.

1 Window object:All Browsers support window objects, which represent browser windows. All JavaScript global objects, global functions, and variables automatically become members of the Window object. A global variable is a property of a Window

DIV + CSS Adaptive Layout, divcss adaptive Adaptive Layout can be divided into two types: height and width. There are many methods. I use three columns for layout examples. I have a few simple examples and I understand three columns, the principles

A simple animation effect implemented by native javascript, implemented by javascript This article introduces an animation implemented by javascript. Click Start to move the div to the right. After you click STOP, The div stops moving, and then

Angular updates direve VE and angulardirective based on the service status. Angular JS (Angular. JS) is a set of frameworks, templates, and data binding and rich UI components used to develop web pages. It supports the entire development process and

Deep understanding of CSS deformation transform (2d) and csstransform* Directory [1] deformation source [2] deformation function [3] Before multi-value CSS deformation transform is a set of effects. It mainly involves four basic operations: movement,