Introduction Development, there are many places to use the Linkage menu, each time before the linkage menu to write again, the code reuse rate is very low, a few days ago again encountered the problem of linkage menu, summed up, found that can
Let's start with how callbacks is used: the first example
function A () {}
Function B () {}
var cb = $. Callbacks ();
Cb.add (a);
Cb.add (b);
Cb.fire (); //You will execute the a method first and then execute the B method
The above probably
Javasscript has 5 simple data types (also a basic data type): Undefined, Null, Boolean, number, String 1 of complex data types: Object The data type of all values in JavaScript is one of the above 6 types. So we need a way to detect what type of
Array arrays1. Introduce An array is an ordered collection of values. Each value is called an element, and each element has a position in the array, represented by a number, called an index. JavaScript arrays are untyped: array elements can be of
We understand that the IMG element loading failure can be performed as a function of the optimization scheme asynchronous, this article intends to do a more in-depth study of the loading behavior of IMG elements.
Ii. related properties and events
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:
First, the preface
Because a very small project or a few pages but to catch up on jquery, of course, is not worth, gzip, at least, there are small dozens of K. In order to be able to operate the DOM conveniently, we need to write a lot of
JavaScript array Basic operations
An array in JavaScript is a special object that represents the index of an offset as an attribute of the object, which may be an integer, but these numeric indices are internally converted to string types because
But the recent leaves gave me a regular, let me suddenly enlightened, than I wrote more sharp, so today take out a simple say (just say the decimal part of the match). First look at what I wrote before:/\d+ (?: \. \d+)? (?: [ee][+-]?\d+)? \.\d+ (?: [
Learning points:1. Use the Validate.js plugin2. Default validation rules3.validate () Methods and options4.validate.js Other Features
Verification Plug-in (Validate.js) is a plug-in that verifies the legality of regular form data. Use it, greatly
Method one, using the remainder operator to judge
Any integer will be divisible by 1, that is, the remainder is 0. Use this rule to determine whether an integer.
function Isinteger (obj) {return obj%1 = = 0}Isinteger (3)//TrueIsinteger
JavaScript's "Concurrency Model" is based on the event loop. This concurrency model differs from Java multithreading, and JavaScript concurrency is single-threaded.
I simply drew a JavaScript execution diagram, and we went through the diagram to
In the basics of JavaScript programming, arrays are what we most often encounter, and some of the common methods of arrays are what we have to master, and here we summarize the methods commonly used in arrays .
ToString () and valueof () methods
Take the process of Hadoop as an example, you can view it as a common Java process
1.tmpwatchman Tmpwatch can see that tmpwatch is used to remove some temporary file name that was not used at the time
tmpwatch-removes files which haven ' t been
Internet | page | page
1. text box Input Restrictions
Implementation limit input large, lowercase English, digital, floating-point decimal, date, Chinese, some English, some Chinese and many other functions. Add it directly to the HTML code to use
A little bit about the border in the lazy chapter, the complete PPT is here.
Principle
CSS Box model
A box includes: margin+border+padding+content
– A smooth diagonal line appears at the junction of the top and bottom border.
xml| Shopping Cart
Shopping cart is an indispensable part of E-commerce site, but at present, most shopping carts can only be displayed as a customer selected goods, the client can not extract the contents of the cart to meet the needs of their own
xml| syntax Now let's use Notepad to create our XML file. First look at an XML file:
Example 1
〈?xml version= "1.0" encoding= "gb2312"?ResourcesBooksName 〉xml Introductory Refinement 〈/nameAuthor John 〈/authorPrice currency unit = "RMB"
Xml
Only suitable for the XML file structure has a certain understanding of scholars, not suitable for beginners. Please read in order from top to bottom.
Whitespace is not important for HTML files, however, the default position for XML is to
js|xml| interaction
Both XML and JSP are technologies that have emerged in the last two years and have become a hot topic for many programmers. XML (Extensible Markup Language) is a framework for defining document markup languages, which are used
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