Basic JavaScript instance
Generate text
Generate common text and tags
Head Section
Body section
External Javascript
ExampleJavascript statements, comments, and code blocks
Javascript statements
JavaScript code block
Allows you to switch between the left and right Images Based on javascript and switch between javascript and javascript.
This article introduces the code for javascript to implement switching between the left and right sides of an image. The code is for your reference. The details are as follows:
:
Code:
The above is
How to dynamically load javascript files and load javascript files using javascript
How to dynamically load js files using javascript:Sometimes we need to dynamically load js files as needed. This chapter will briefly introduce how to implement this function, hoping to bring some help to friends who need it.I. Common loading methods:
The above is a common meth
The HTML
The above code will generate the following output in the HTML page:
Hello World! Example:
To insert Javascript into an HTML page, you need to use the can tell the browser where JavaScript starts and ends.
Document. WriteA field is a standard JavaScript command used to write output to a page.
After the document. Write command is input to the , the brow
We can use JavaScript to create dynamic images.Instance
Button Animation
Two different events are used to drive two corresponding functions, and two corresponding images are switched to create an animation effect.
Javascript Animation
It is feasible to create dynamic images using JavaScript.
TipsYes: use JavaSc
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Syntax
Instance
Instance-Infinite Loop
Syntax
Instance
By using JavaScript, we have the ability to execute code after a set interval, rather than immediately after the function is called. We call it a timing event.Instance
Simple timing
After you click the button in this example, a warning box will pop up in five seconds.
Another simple timing
In this example, the program runs 2 seconds, 4 seconds
Upgrade JavaScript (JavaScript you Don't know) to improve javascriptRecently, I have read the book "JavaScript (on-volume) You don't know", which details many important but often overlooked JavaScript points. I strongly recommend this book !!! In the book, Chapter 1 describes "Upgrade", describes the process of variabl
This article mainly introduces how to implement the inheritance of javascript and how to learn javascript object-oriented. If you are interested, refer to the examples in this article to introduce 6 methods for implementing the inheritance of javascript, the content is as follows:
1. [prototype chain inheritance]The essence of implementation is to override the p
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Event example:
Events are behaviors that can be detected by JavaScript.Event
Javascript enables us to create dynamic pages. Events are behaviors that can be detected by JavaScript.
Each element in the web page can generate events that can trigger JavaScript Functions. For example, when a user clicks a button, an onclick event is generated
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
As we all know, in c and java, the main function provides the main method as the entry function or method of a program. Starting from the header of the JS source file in js, we can still create a main function as the starting point of the program, so that it can be integrated with other languages, and you may have a deeper understanding of JS. If you are interested, you can learn it with xiaobian. In C and Java, there is a program entry function or method, that is, the main function or main meth
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Syntax for creating a function:
Example
A function is an event-driven or reusable code block that is executed when it is called.Instance
Function
How to call a function.
Functions with Parameters
How to pass a variable to a function and how to use the variable in the function.
Function 2 with Parameters
How to pass multiple variables to the function, and how to use these variables in the function.
Return Value Function
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
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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
In this topic, we will discuss JavaScript testing to check whether the component status and working method meet expectations. We will also introduce a testing method that facilitates the compilation of test cases. The tests mentioned here are of course the use of automated testing methods, which is an important part of software quality assurance (QA.
In this topic, we will discuss JavaScript testing to chec
Recently, I have passed some tests to comprehensively parse the JavaScript code execution sequence of web pages in various browsers and record them here. We know that javaScript is an interpreted language, and its execution is top-down, but the understanding of each browser is slightly different, the upstream and downstream of the code, that is, the Program Stream, is crucial to the correctness of the progr
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