Summary of the use of extend() in jQuery-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

Summary of the use of extend() in jQuery

黄舟

Dec 04, 2017 am 09:22 AM

extendjquerySummarize

In our daily development work, the use of jQuery is indispensable, so I believe many friends will use the use of extend() in jQuery, so we will give it to you today Let’s introduce in detail the summary of the use of extend() in jQuery!

jQuery provides two methods for developing plug-ins, namely:

jQuery.fn.extend(object); 
jQuery.extend(object);

jQuery.extend(object); to extend the jQuery class itself. Add new methods to the class.
jQuery.fn.extend(object); Add methods to jQuery objects. This should be easy to understand. for example.

The code is as follows:

<span style="font-size:18px;"><html> 
<head> 
<title></title> 
</head> 
<body> 
<h3 id="new-nbsp-soul">new soul</h3> 
<h3 id="new-nbsp-soul">new soul</h3> 
<h3 id="new-nbsp-soul">new soul</h3> 
<h3 id="new-nbsp-soul">new soul</h3> 
<script type="text/javascript" src="jquery.2.0.3.js"></script> 
<script type="text/javascript"> 
jQuery.fn.myPlugin = function(options) { 
$options = $.extend( { 
html: "no messages", 
css: { 
"color": "red", 
"font-size":"14px" 
}}, 
options); 
return $(this).css({ 
"color": $options.css.color, 
}).html($options.html); 
} 
$(&#39;.ye&#39;).myPlugin({html:"So easy,yes?",css:{"color":"green","font-size":"20px"}}); 
</script> 
</body> 
</html> 
</span>

Okay, you also saw a little usage of $.extend() above.

1. Merge multiple objects.
What is used here is the function of nesting multiple objects of $.extend().
The so-called nesting of multiple objects is somewhat similar to the operation of merging arrays.
But here is the object. for example.

The code is as follows:

<span style="font-size:18px;">//用法: jQuery.extend(obj1,obj2,obj3,..) 
var Css1={size: "10px",style: "oblique"} 
var Css2={size: "12px",style: "oblique",weight: "bolder"} 
$.jQuery.extend(Css1,Css2) 
//结果:Css1的size属性被覆盖,而且继承了Css2的weight属性 
// Css1 = {size: "12px",style: "oblique",weight: "bolder"} 
</span>

2. Deeply nested objects.

The code is as follows:

<span style="font-size:18px;"> jQuery.extend( 
{ name: “John”, location: { city: “Boston” } }, 
{ last: “Resig”, location: { state: “MA” } } 
); 
// 结果: 
// => { name: “John”, last: “Resig”, location: { state: “MA” } } 
// 新的更深入的 .extend() 
jQuery.extend( true, 
{ name: “John”, location: { city: “Boston” } }, 
{ last: “Resig”, location: { state: “MA” } } 
); 
// 结果 
// => { name: “John”, last: “Resig”, 
// location: { city: “Boston”, state: “MA” } } 
</span>

3. You can add static methods to jQuery.

The code is as follows:

<span style="font-size:18px;"><html> 
<head> 
<title></title> 
</head> 
<body> 
<script type="text/javascript" src="jquery.2.0.3.js"></script> 
<script type="text/javascript"> 
$.extend({ 
add:function(a,b){return a+b;}, 
minus:function(a,b){return a-b}, 
multiply:function(a,b){return a*b;}, 
pide:function(a,b){return Math.floor(a/b);} 
}); 
var sum = $.add(3,5)+$.minus(3,5)+$.multiply(3,5)+$.pide(5,7); 
console.log(sum); 
</script> 
</body> 
</html>
</span>

Summary:

This article introduces jQuery to everyone through detailed introduction of examples. In the use of extend(), I believe that my friends have a better understanding of the use of extend. I hope it will be helpful to your work!

Related recommendations:

jquery’s extend method analysis

Detailed introduction and use of extend usage in JQuery

Detailed explanation of usage examples of jQuery.extend function

The above is the detailed content of Summary of the use of extend() in jQuery. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Java vs JavaScript: A Detailed Comparison for DevelopersMay 16, 2025 am 12:01 AM

JavaandJavaScriptaredistinctlanguages:Javaisusedforenterpriseandmobileapps,whileJavaScriptisforinteractivewebpages.1)Javaiscompiled,staticallytyped,andrunsonJVM.2)JavaScriptisinterpreted,dynamicallytyped,andrunsinbrowsersorNode.js.3)JavausesOOPwithcl

Javascript Data Types : Is there any difference between Browser and NodeJs?May 14, 2025 am 12:15 AM

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.

JavaScript Comments: A Guide to Using // and /* */May 13, 2025 pm 03:49 PM

JavaScriptusestwotypesofcomments:single-line(//)andmulti-line(//).1)Use//forquicknotesorsingle-lineexplanations.2)Use//forlongerexplanationsorcommentingoutblocksofcode.Commentsshouldexplainthe'why',notthe'what',andbeplacedabovetherelevantcodeforclari

Python vs. JavaScript: A Comparative Analysis for DevelopersMay 09, 2025 am 12:22 AM

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.

Python vs. JavaScript: Choosing the Right Tool for the JobMay 08, 2025 am 12:10 AM

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: Understanding the Strengths of EachMay 06, 2025 am 12:15 AM

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.

JavaScript's Core: Is It Built on C or C ?May 05, 2025 am 12:07 AM

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

JavaScript Applications: From Front-End to Back-EndMay 04, 2025 am 12:12 AM

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.

See all articles