[jQuery framework, Java programming tutorial video download

Programmer Jie Jie 2021-08-08 19:21:52
jquery framework java programming tutorial


jQuery The concept of

=============

jQuery It's a fast one 、 concise JavaScript frame , Is the Prototype And then another excellent one JavaScript The code base ( or JavaScript frame ).jQuery The purpose of the design yes “write Less,Do More”, That is to say, write less code , Do more . It encapsulates JavaScript Common function codes , Provides a simple JavaScript Design patterns , Optimize HTML The document operation 、 Event handling 、 Animation design and Ajax Interaction . It's used to simplify JS Development

And for JavaScript frame , In essence, they are some js file , Encapsulates the js The native code of .

jQuery Quick start

==============

1、 download jQuery


??? at present jQuery There are three major versions :

1.x edition : compatible ie678, The most widely used , At present, the government only does BUG maintain , No more features . So in general, for projects , Use 1.x The version will do , Final version :1.12.4 (2016 year 5 month 20 Japan )

2.x edition : Are not compatible ie678, Few people use , At present, the government only does BUG maintain , No more features . If you do not consider the compatibility of the lower version of the browser can use 2.x, Final version :2.2.4 (2016 year 5 month 20 Japan )

3.x edition : Are not compatible ie678, Only the latest browsers are supported . Unless otherwise required , Generally not used 3.x Version of , Many old jQuery The plug-in does not support this version . At present, this version is mainly updated and maintained by the official . The latest version can be found on the official website , Direct to the official website .

We are downloading and using jQuery You will find , There are usually two js file , One is to bring .min Of , The other is not carrying .min Of .

jquery-xxx.js And jquery-xxx.min.js difference :

1. jquery-xxx.js: Development version . For programmers , Well indented and annotated . It's bigger

2. jquery-xxx.min.js: Production version . Used in program , No indent . Smaller size . The program loads faster

So we usually import the second one when we use it jquery-xxx.min.js Production version of

2、 Import JQuery Of js file


Import min.js file

After the html The header of the file is imported to the js Link to file , As shown below :


<head>
<meta charset="UTF-8">
<title>jquery Quick start </title>
<script src="js/jquery-3.3.1.min.js"></script>
</head>

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3、jQuery Use


We use jQuery When getting an element object , have access to “$()” As a selector , Get the content in the label body . Use... Respectively jQuery And don't use jQuery Get tag content , Make a practical comparison .


<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jquery Quick start </title>
<script src="js/jquery-3.3.1.min.js"></script>
</head>
<body>
<div id="div1">div1...</div>
<div id="div2">div2...</div>
<script> // adopt jQuery Object to get the specified ID object  var div1 = $("#div1"); var div2 = $("#div2"); // adopt alert Output the result ( With jQuery Get the value in the form of ) alert(div1.html()); alert(div2.html()); /** * Here's not to use jQuery Methods * */ // Don't use jQuery Get specified ID object  var div3 = document.getElementById("div1"); var div4 = document.getElementById("div2"); // Don't use jQuery Get element content  alert(div3.innerHTML); alert(div4.innerHTML); </script>
</body>
</html>

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jQuery Objects and JS Object differentiation and transformation

======================

Compared with JS object ,jQuery Objects are more convenient to operate , The code is more concise

** But here's the thing :jQuery Objects and JS Object's method is not universal ,** So if we want to be in jQuery Use in js Method , Or in the js Use in jQuery How to do it ?

therefore , Let's share with you jQuery Objects and JS The transformation of objects

jQuery To js


Use jQuery object [ Indexes ] perhaps jQuery object .get( Indexes ) take jQuery Object to js object , You can use js Methods .

Detailed use of the following code :


<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jquery and js The transformation of objects </title>
<script src="js/jquery-3.3.1.min.js"></script>
</head>
<body>
<div id="div1">div1...</div>
<div id="div2">div2...</div>
<script>
/**
* jQuery To js
* */
//1、 adopt js It's called div All of the html Element object
# summary
Above knowledge points , It includes the mainstream application technologies of current Internet enterprises and what can make you “ The bestselling ” Advanced architecture knowledge , Almost every note contains actual combat content .
** Many people worry that learning is easy to forget , Here's a way to teach you , That is repeated learning .**
For example , If you're learning spring annotation , Suddenly I found an annotation @Aspect, I don't know what to do , You may check the source code or learn from a blog , It took half an hour to figure it out , Next time I see @Aspect 了 , You're a little depressed , It seems that I studied there last time , It took you five minutes to quickly open a web page and learn again .
** Data collection method : Get it free of charge here **
From the comparison of half an hour and five minutes, we can find that learning more is a step closer to mastering knowledge .
![](https://s2.51cto.com/images/20210808/1628421498692614.jpg)
Human nature is easy to forget , Only by constantly impressing 、 Repeat learning can really master , So I recommend you to read many books . There are so many geniuses , He just read more books than you .
![](https://s2.51cto.com/images/20210808/1628421498724120.jpg)
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版权声明
本文为[Programmer Jie Jie]所创,转载请带上原文链接,感谢
https://qdmana.com/2021/08/20210808192118306m.html

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