<div class="test2" id='2'></div>
<div class="test3" id='3'></div>
<div class="test" id='0'></div>
document.querySelector(".test")
document.querySelectorAll(".test")
document.getElementsByClassName("test")
document.getElementById("0")
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
querySelector | |
querySelectorAll | |
getElementsByClassName | |
getElementById |
Test name | Executions per second |
---|---|
querySelector | 3738845.0 Ops/sec |
querySelectorAll | 1540853.8 Ops/sec |
getElementsByClassName | 7151239.0 Ops/sec |
getElementById | 6626049.5 Ops/sec |
Overview of the Benchmark
The provided JSON represents a JavaScript microbenchmark that compares the performance of four different DOM querying methods in Firefox 94 on Windows Desktop:
document.querySelector
document.querySelectorAll
document.getElementsByClassName
document.getElementById
These methods are used to select elements from an HTML document using their class, id, or other attributes.
Methods Comparison
The benchmark compares the performance of these four methods in different scenarios. Here's a brief overview of each method and its pros and cons:
document.querySelector
:document.querySelectorAll
:querySelector
for selecting multiple elements at once.document.getElementsByClassName
:querySelectorAll
when selecting elements by class name alone.querySelector
or querySelectorAll
for more complex selections.document.getElementById
:Library Usage
None of the benchmark methods use any external libraries or frameworks.
Special JS Features
The benchmark uses standard JavaScript features such as DOM queries and HTML document structure. No special syntax or features are used beyond what is required for the DOM queries.
Other Alternatives
If you're interested in exploring alternative approaches, here are a few options:
document.querySelector
with attribute selectors: Using querySelector
with attribute selectors (e.g., [class="test"]
) can be faster than using class names or ids.CSS Selectors
: Using CSS selectors (e.g., .test
) can be even faster than DOM queries for selecting elements by class name alone.Query Library
alternatives: There are alternative query libraries available, such as querySelectorAll
-style functions like querySelectorAll
-like methods in the cheerio
library, which may offer better performance or flexibility.Keep in mind that these alternatives might require additional setup and configuration to work with your specific use case.