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getBoundingClientRect vs offsetWidth/offsetHeight (http://jsbench.github.io/#8269752a98dee94f58319328a14bf8a7) #jsbench #jsperf
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>getBoundingClientRect vs offsetWidth/offsetHeight</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script>
<script src="./suite.js"></script>
</head>
<body>
<h1>Open the console to view the results</h1>
<h2><code>cmd + alt + j</code> or <code>ctrl + alt + j</code></h2>
</body>
</html>
Raw
suite.js
"use strict";
(function (factory) {
if (typeof Benchmark !== "undefined") {
factory(Benchmark);
} else {
factory(require("benchmark"));
}
})(function (Benchmark) {
var suite = new Benchmark.Suite;
Benchmark.prototype.setup = function () {
if(!document.querySelector("#myDiv")) {
const div = document.createElement('div');
div.style.display = 'inline-block';
div.setAttribute('id', 'myDiv');
const textNode = document.createTextNode('_');
div.appendChild(textNode);
document.body.appendChild(div);
}
const myDiv = document.querySelector("#myDiv");
const myTextNode = myDiv.firstChild;
};
suite.add("window.foo = !window.foo;", function () {
window.foo = !window.foo;
const rect = myDiv.getBoundingClientRect();
myTextNode.data = `${window.foo} ${rect.width} ${rect.height}`;
});
suite.add("window.foo = !window.foo;", function () {
window.foo = !window.foo;
const width = myDiv.offsetWidth;
const height = myDiv.offsetHeight;
myTextNode.data = `${window.foo} ${width} ${height}`;
});
suite.on("cycle", function (evt) {
console.log(" - " + evt.target);
});
suite.on("complete", function (evt) {
console.log(new Array(30).join("-"));
var results = evt.currentTarget.sort(function (a, b) {
return b.hz - a.hz;
});
results.forEach(function (item) {
console.log((idx + 1) + ". " + item);
});
});
console.log("getBoundingClientRect vs offsetWidth/offsetHeight");
console.log(new Array(30).join("-"));
suite.run();
});
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