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Recently, looking at some of the JavaScript principles of the article, happened to see the jquery author of a JavaScript timer on the principle of the analysis, and so scared to decide to translate the original text into Chinese, one is to share

1) Intro Not long ago I set up a technology group in a MM asked a question like this, she posted the code as follows: var a = 1;function hehe (){Window.alert (a);var a = 2;Window.alert (a);}Hehe (); The results of the execution are as follows:

3 problems related to the scope chain The scope chain is a very red concept in the JavaScript language, and many programmers who learn and use the JavaScript language know that the scope chain is key to understanding some of the most important

4 issues related to this, new, call and apply The principle of this pointer is a very complicated question, and if we illustrate this from the implementation mechanism of this in JavaScript, many friends may become more and more confused, so this

First, you need to know the general usage of jquery.deferred, and then let's get to the point: Library code: /*!  * multithreaded asynchronous queues  * rely on the jQuery 1.8+ (if you are using 1.6 or 1.7, simply replace the then method in the

When talking about asynchronous programming, I will mainly from the following three aspects to summarize asynchronous programming ( Note: Special explanation: is summed up, I am also rookie, so summed up the bad, please Daniel a lot of forgiveness!)

Closures have been heard in the first contact with JavaScript. The first thing to be clear is that it does not understand complexity, and it is very useful. So what are the basics before we get to know about closures? I personally think that the

In JavaScript, the callback function is specifically defined as: function A is passed to another function B as an argument (a function reference), and this function B executes function A. Let's just say function A is called a callback function. If

Organize the JS object-oriented encapsulation and inheritance. 1. Package JS is packaged in a number of ways to implement, here are listed in several commonly used. 1.1 Raw Pattern Generation objects Write our members directly into the object

My last blog title is wrong, causing some misunderstanding. I think the purpose of blogging is not to recite textbooks, but to share research and development experience. My last title was changed to "one of the topics of JavaScript closures: its

Don't write anything today, just share a thought.In the group before the discussion, the Shei Liang brothers said to determine whether the password is pure numbers, pure letters and so on.If you are writing with if or switch to look at the egg pain,

Cookies and sessions are commonly used to implement the Http state of the technology, in the continuous use of their own understanding of it. My next discussion is based on the following sequence: 1. Why to use cookies and session Because the

For JavaScript inheritance and prototype chain, although I read the book before listening to the session, but still feel foggy, can not help but sigh JavaScript is really a magical language. After sponsor one-on-one counseling and their own back

Event delegation, also called an event delegate. is a common technique for binding events commonly used in JavaScript. As the name implies, "event Agent" is to delegate the original need to bind the event to the parent element, so that the parent

As a front-end developer in the Web display often encounter, the title is too long, need to intercept the string, with the implementation of CSS various compatibility problems, various pits. Let the background program, and a variety of Dodge, let

Order Most of the most appropriate methods for JavaScript are summarized. Type ? Original type: We can use the value directly. Οstring Οnumber Οboolean Οnull οundefined Searchindex var foo = 1, bar = foo; bar = 9; Console.log (foo, bar); => 1,

Order I did not appear in the recommendation column for a long time, it seems that a good response, so the continuation of the article. Properties ? When accessing properties, we use the dot (.) operator. var Luke = { Jedi:true, Age:28 }; Bad var

Order Go on to the top two, this is the end of the article. Blocks ? There is the code of {}, we wrap the line processing. Bad if (test) return false; Good if (test) return false; Good if (test) { return false; } Bad function () {return false;} Good

Share a JavaScript optimization technique for writing functions. The applicable function should satisfy the following criteria: produce a fixed result Multiple calls on the page Complex or more time-consuming Code and analysis are as follows: A

Process | recovery | data | database Recovery test, simulated database hard disk damage data loss.1, Database Full backup,2, backup data files, control files, SPFile, password files3, delete the database (with DBCA delete), leaving only the Oracle