pubsub javascript

Javascript is a scripting language designed for interaction with Web pages. It is constructed by the following three departments l ECMAScript, defined by a ECMA-262, defining the rules and conventions of the javascript language, it is like the rules, specifications, and conventions specified for starting a game. L DOM: provides methods and interfaces for accessing and operating webpage content L BOM, which

Javascript: Javascript special effect: convert HTML into Javascript code automatically. Sometimes you need to use Javascript to enter common characters, such as a footer for every page. Here is a conversion script: SCRIPT function Preview (obj) {var TestWin = open (''); TestWin.doc ument. write (obj. value);} function

The 2.1.2 Delay script refers to the defer property and only applies to external scripts, that is, scripts that have defer properties.Delaying scripts at the bottom of the page is still the best choice due to the lack of uniform support for deferred scripting by various delay browsers and the fact that the defer attribute is no longer supported after HTML5.2.1.3 Asynchronous Script The second script may be executed before the first script, so it is important to ensure that two scripts are not d

Recently, I was looking at the JavaScript advanced programming design (the third edition). The object-oriented chapter has more than 20 pages, and I went back and forth for three or five times. The results of each reading were different. The first time I went over it, I was confused, as a result, when I went to bed at night, I found a lot of problems and I couldn't understand anything. I looked at it again and found it was like this. After a few days,

Traditionally, Javascript files are loaded using the script tag. We can also use the DOM method to dynamically load Javascript files. The specific implementation is as follows. If you are interested, refer to the traditional method, the script label is used to load Javascript files. As shown below:

The javascript design pattern is turing Publishing. in learning, I want to focus on every chapter. Question: 1.1 javascript flexibility Object-oriented Javascript programming mode: 1. Saving state 2. methods that can be called within an object 3. Better understanding of the structure of a program, able to withstand iterative development (in my opinion) The Co

Document directory Attribute Method 1. Create an instance of the object 2. Create an object Template Objects help organize information.Instance Instance of the created object This example shows how to create an instance of the javacripobject ). Create an object Template This example shows you how to create a template for a javacript object ). JavaScript Object In the previous section of this tutorial, we have learn

Javascript (1) Summary of javascript Array usage (2), javascript Array // 1. array sorting. The default value is ascending. The sort () method calls the toString () of each item in the array, and then compares the obtained string to sort the result. // sort (): returns the sorted array // var arr = [23,1, 3,56, 42,-1]; // arr. sort (); // alert (arr); //-, // eve

ObjectiveRecently read the book "JavaScript design Mode". There is a lot of knowledge in the book, which can not be digested in a moment. Write it down first.PS: Another part of the content of Uncle Tom Blog in-depth understanding of the JavaScript seriesConstructor (Constructor) modeThe object constructor is used to create objects of a specific type-prepare objects for use, and at the same time accept the

Javascript learning diary-prevents javascript events from bubbling and obtains the Control ID value 1. How to Prevent event bubbles The Code is as follows: // Non-IEIf (event event. stopPropagation)Event. stopPropagation ();Else // IEWindow. event. cancelBubble = true; 2. Get the Control ID The Code is as follows: If (document. all ){// IEAlert (event. srcElement. tagName + ":" + event. srcEl

How many seconds does function sleep in js? Javascript beginners often ask this question. Since the emergence of Javascript, this function is so necessary, but why does js not provide such a function? Currently, all browsers parse js in the UI thread. Taking Firefox as an example, I re-compiled the js engine and added the sleep method to the js alert. This method calls the C language thread sleep functio

This article mainly introduces a simple example of implementing the TAB switch Effect of js (JavaScript). If you need it, you can refer to it and hope to help you with JavaScript) the tab Label Switching code of, can automatically adapt to the width, you can add and delete the label block yourself, you can complete the silly operation! The Code is as follows: 19991224/loose. dtd "> Adaptive width labe

Document directory Instance 1 Instance 2 Syntax: Instance Syntax: Instance: The Condition Statement in Javascript is used to complete the action under different conditions.Instance If statement How to compile an if statement. If... else statement How to compile the IF... else statement. If. Else if... else statement How to compile the IF... else if... else statement Random Link This exam

This article mainly introduces how to increase the loading speed of javascript. write output js solves the problem of slow ad loading speed. If you need it, you can refer to it. Generally, some js Code will be loaded on our website, such as statistics, google ads, Baidu alliance, alimama advertising code, The page loading speed was slow and slow. Solution: Use a js inclusion method to increase the loading speed of

When JavaScript is used on pages, where should these JS code be placed? Next, let's learn how to use JavaScript on the page. where should these JS code be put? Let's take a look. Generally, there are two ways to write on the interface and use. js files. 1.1 Head part on the interface You can directly put it in the head label, as shown in the following code: TestPage

How to systematically learn JavaScript and learn javascript In the past, JavaScript was only used for some simple web page effects, such as form verification and floating advertisements. At that time, JavaScript was not taken seriously. Since the beginning of AJAX popularity, people have found that using

Examples of the Observer Pattern in the JavaScript programming design Pattern are described in detail. This article describes the observer mode of the JavaScript programming design mode. We will share this with you for your reference. The details are as follows: Introduction A simple observer Mode means that an object (subject) maintains a list of objects dependent on it. When its status changes, it automat

JavaScript Asynchronous ProgrammingChapter one in-depth understanding of JavaScript events1. Javascirpt is generally single-threaded, SetTimeout and setintervalExecutes only when the CPU is idle.var start = new Date; SetTimeout (function () {var end = new Date;Console.log (' Time elapsed: ', End-start, ' Ms '); }, 500);while (new Date-start Explanation: SetTimeout, there is a delay event queued to handle th

JavaScript Design ModePreface I recently read the book "JavaScript Design Patterns", which contains many knowledge points and cannot be digested for a moment. Remember it first.Ps: For more information, see Uncle Tom's blog to understand the JavaScript series.Constructor Mode The Object constructor is used to create objects of a specific type-prepare objects for

You can create three message boxes in javascript: Warning box, confirmation box, and prompt box.Instance Warning box Warning box with lines Confirmation box Prompt box Warning box The warning box is often used to ensure that users can obtain certain information. When a warning box appears, you must click OK to continue the operation.Syntax: Alert ("text ")Confirmation box The confirmation box enab