<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/3.6.1/jquery.min.js"></script><script> var $jq331 = $.noConflict(true);</script><div> <ul id="menu"> <li class="menu-item">1</li> <li class="menu-item">2</li> <li class="menu-item">3</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> <li class="menu-item">4</li> </ul></div>function tests($) { $(".menu-item").eq(2).closest("ul").css({ "background-color": "red" }).parent().css({ "border": "1px solid blue" }).append($("<p></p>").text("Text.").css({ "background-color": "green" })).end().end().remove(); console.log('tests' + $);}tests($jq1124);tests($jq224);tests($jq331);--enable-precise-memory-info flag.
| Test case name | Result |
|---|---|
| jq1.12.4 | |
| jq2.2.4 | |
| jq3.4.1 |
| Test name | Executions per second |
|---|---|
| jq1.12.4 | 29294.9 Ops/sec |
| jq2.2.4 | 41290.9 Ops/sec |
| jq3.4.1 | 36982.4 Ops/sec |
Measuring the performance of JavaScript libraries is crucial for understanding their impact on website loading times, memory usage, and overall user experience.
The provided JSON data represents a benchmark test that compares the execution speed of three different versions of jQuery: 1.12.4, 2.2.4, and 3.6.1.
Library Comparison
In this test, the same JavaScript code is executed with each version of jQuery to measure their performance differences. The tests function takes a jQuery object as an argument ($) and performs a specific operation (in this case, modifying the DOM).
The pros of comparing different versions of jQuery include:
However, there are some potential cons:
Other Considerations
Some other factors that could impact performance in this test include:
Library Usage
The $.noConflict() method is used to force jQuery to return a new version of itself, which is then passed as an argument to the tests function. This helps isolate the effects of different versions of jQuery while preserving compatibility with existing code that relies on the original version.
Special JS Features or Syntax
There are no special JavaScript features or syntax mentioned in this test.
Alternatives
Some alternatives for measuring JavaScript performance include:
Keep in mind that measuring performance is just one aspect of evaluating libraries or code. Other factors like maintainability, documentation, and compatibility should also be considered when choosing a library or implementing new features.
