<script src='https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/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/3.3.1/jquery.min.js"></script>
<script>
var $jq331 = $.noConflict(true);
</script>
<div>
<ul id="menu">
<li class="menu-item">1</li>
<li class="menu-item">2</li>
<li class="menu-item">3</li>
<li class="menu-item">4</li>
</ul>
</div>
function tests($) {
$(".menu-item").eq(2).closest("ul").css({
"background-color": "red"
}).parent().css({
"border": "1px solid blue"
}).append($("<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 |
---|---|
$jq1124 | |
$jq224 | |
$jq331 |
Test name | Executions per second |
---|---|
$jq1124 | 15871.3 Ops/sec |
$jq224 | 21573.3 Ops/sec |
$jq331 | 21593.8 Ops/sec |
Let's break down what's being tested in this JavaScript microbenchmark.
Benchmark Definition
The benchmark definition is provided as a JSON object, which includes the following information:
Script Preparation Code
: This code is executed before running the benchmark. In this case, it creates a jQuery instance and performs some DOM manipulation using the $
variable.Html Preparation Code
: This code is used to set up the HTML environment for the benchmark. It loads different versions of jQuery (1.7.2, 2.2.4, and 3.3.1) and assigns them to variables with a .noConflict()
method call. The .noConflict()
method is used to mitigate conflicts between multiple libraries using $
as their variable.Individual Test Cases
The benchmark consists of three test cases:
"$jq1124"
: This test case uses the oldest version of jQuery (1.7.2) and runs the tests($jq1124)
function."$jq224"
: This test case uses a newer version of jQuery (2.2.4) and runs the tests($jq224)
function."$jq331"
: This test case uses the latest version of jQuery (3.3.1) and runs the tests($jq331)
function.Options Compared
The benchmark is comparing three options:
Pros and Cons of Each Approach
Library
The $.noConflict()
method is used to mitigate conflicts between multiple libraries using $
as their variable. In this case, jQuery uses $
internally, but the .noConflict()
method allows other libraries to use $
without conflicting with jQuery's functionality.
Special JS Feature or Syntax
There are no special JavaScript features or syntax mentioned in the benchmark definition that would require any specific knowledge of modern JavaScript.
Other Considerations
When running this benchmark, it's essential to consider the following factors:
Alternatives
There are several alternatives to this approach that could be used for benchmarking JavaScript libraries:
I hope this explanation helps!