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[jQuery framework (3), what causes the CPU utilization of Java applications to soar
2021-08-27 02:11:37 【No hair loss Xiaoyi】
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 :
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 .
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 :
js To jQuery
Use “ (js object )
It can be used later jQuery The method of the ,
Detailed use of the following code :
Last
After all, I've been working for so long , Except for tuhu round , I also interviewed many big factories in July and August , Like Ali 、 Are you hungry 、 Meituan 、 Didi, these interview processes are not written in this article one by one . I will sort out a detailed interview process and some details of questions you want to know
Meituan interview experience
Experience in job interview
Rookie interview experience
Ant gold interview experience
Vipshop interview experience
Because of the limited space , The picture and text cannot be sent in detail , Interested friends You can click here to go to my Tencent document Free access to the above information !
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