<script src='https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js'></script><script> var $jq1124 = $.noConflict(true);</script><script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script><script> var $jq224 = $.noConflict(true);</script><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script><script> var $jq341 = $.noConflict(true);</script><div> <ul id="menu"> <li class="menu-item">1</li> <li class="menu-item">2</li> <li class="menu-item">3</li> <li class="menu-item">4</li> </ul></div>function tests($) { $(".menu-item").eq(2).closest("ul").css({ "background-color": "red" }).parent().css({ "border": "1px solid blue" }).append($("<p></p>").text("Text.").css({ "background-color": "green" })).end().end().remove(); console.log('tests' + $);}tests($jq1124);tests($jq224);tests($jq341);--enable-precise-memory-info flag.
| Test case name | Result |
|---|---|
| $jq1124 | |
| $jq224 | |
| $jq341 |
| Test name | Executions per second |
|---|---|
| $jq1124 | 7786.5 Ops/sec |
| $jq224 | 9305.9 Ops/sec |
| $jq341 | 9368.7 Ops/sec |
Let's break down the benchmark and explain what's being tested.
Overview
The benchmark tests the speed of different jQuery versions (1.12.4, 2.2.4, and 3.4.1) in a JavaScript microbenchmarking framework called MeasureThat.net.
Benchmark Definition JSON
The Benchmark Definition JSON represents a single test case with three variations:
tests($jq1124): Tests the speed of jQuery version 1.12.4.tests($jq224): Tests the speed of jQuery version 2.2.4.tests($jq341): Tests the speed of jQuery version 3.4.1.Options being compared
The benchmark compares the execution speed of each jQuery version, which is a measure of how fast the code runs on different machines and browsers.
Pros and Cons of different approaches
$noConflict(true) to rename the jQuery object, the test cases avoid potential conflicts with other libraries that may use the same object name. This ensures a fair comparison of the different jQuery versions.Libraries and their purposes
$.noConflict(): A jQuery method that renames the global jQuery object to $jqX, where X is the version number (e.g., $jq1124 in this benchmark). This helps avoid conflicts with other libraries that may use the same object name.MeasureThat.net: The JavaScript microbenchmarking framework used by MeasureThat.net, which provides a standardized way to measure and compare the performance of different JavaScript code snippets.Special JS features or syntax
None mentioned in the provided Benchmark Definition JSON. However, it's worth noting that some modern browsers may support features like async/await, Promises, or Web Workers, which could potentially affect the benchmark results.
Other alternatives
Benchmark preparation code
The Script Preparation Code defines a test function tests() that takes a jQuery object $ as an argument. The function performs a series of operations on the DOM, including:
.menu-item list and finding its closest parent (ul).The Html Preparation Code includes multiple scripts that load different versions of jQuery, each with $noConflict(true) called to rename the global object name. The HTML also defines a basic DOM structure with an ul list and four .menu-item elements.
I hope this explanation helps! Let me know if you have any further questions or need clarification on specific points.
