1. jQuery fadeIn() is used to fade in hidden elements.
Syntax:
$(selector).fadeIn( speed,callback);
Example:
$("button"). click(function(){
$("#div1").fadeIn();
$("#div2").fadeIn("slow");
$("#div3"). fadeIn(3000);
});
2. The jQuery fadeOut() method is used to fade out visible elements.
Syntax:
$(selector).fadeOut( speed,callback);
3. The jQuery fadeToggle() method switches between the fadeIn() and fadeOut() methods.
fadeToggle() adds a fade-in effect to the element if it is already faded out.
If the element is already faded in, fadeToggle() adds a fade out effect to the element.
Syntax:
$(selector).fadeToggle( speed,callback);
Example: $("button").click(function(){
$("#div1").fadeToggle();
$("#div2").fadeToggle("slow") ;
$("#div3").fadeToggle(3000);
});
4. Syntax:
$(selector).fadeTo(speed,opacity,callback);
The required speed parameter specifies the duration of the effect. It can take the following values: "slow", "fast", or milliseconds.
The required opacity parameter in the fadeTo() method sets the fade effect to the given opacity (a value between 0 and 1). Example
$("button").click(function( ){
$("#div1").fadeTo("slow",0.15);
$("#div2").fadeTo("slow",0.4);
$("#div3").fadeTo("slow",0.7);
});
5. The jQuery slideDown() method is used to slide elements down.
Syntax:
$(selector).slideDown( speed,callback);
$("#flip").click(function( ){
$("#panel").slideDown();
});
6. The jQuery slideUp() method is used to slide elements up.
Syntax:
$(selector).slideUp( speed,callback);
The optional speed parameter specifies the duration of the effect. It can take the following values: "slow", "fast", or milliseconds.
The optional callback parameter is the name of the function to be executed after the sliding is completed.
7. The jQuery slideToggle() method can switch between the slideDown() and slideUp() methods.
If elements slide down, slideToggle() slides them up.
If elements slide up, slideToggle() slides them down.
$(selector).slideToggle(speed,callback);
8. The jQuery animate() method is used to create custom animations.
Syntax:
$(selector).animate( {params},speed,callback);
The required params parameter defines the CSS properties that form the animation.
The optional speed parameter specifies the duration of the effect. It can take the following values: "slow", "fast", or milliseconds.
The optional callback parameter is the name of the function to be executed after the animation is completed.
It is also possible to define relative values (the value is relative to the element's current value). You need to add = or -= in front of the value:
You can also define a group of animates to implement the queue function.
The following example demonstrates a simple application of the animate() method; it moves the
Example
$("button").click (function(){
$("div").animate({left:'250px'});
});
9. The jQuery stop() method is used to stop animations or effects before they complete
10. When the animation is 100% completed, call the Callback function.
Typical syntax:
$(selector). hide(speed,callback)
11. jQuery method link
Some elements only need to be obtained once, so you can use links to append methods.
It’s the method point method. For example,
$("#p1").css(" color","red").slideUp(2000).slideDown(2000);

JavaScript core data types are consistent in browsers and Node.js, but are handled differently from the extra types. 1) The global object is window in the browser and global in Node.js. 2) Node.js' unique Buffer object, used to process binary data. 3) There are also differences in performance and time processing, and the code needs to be adjusted according to the environment.

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The main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.

Whether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.

Python and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.

JavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.

JavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.

Choosing Python or JavaScript should be based on career development, learning curve and ecosystem: 1) Career development: Python is suitable for data science and back-end development, while JavaScript is suitable for front-end and full-stack development. 2) Learning curve: Python syntax is concise and suitable for beginners; JavaScript syntax is flexible. 3) Ecosystem: Python has rich scientific computing libraries, and JavaScript has a powerful front-end framework.


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