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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Patching HTML</title>
<style>
.hello {
color: red;
}
.bye {
color: blue;
}
</style>
</head>
<body>
<div id="root"></div>
<script type="module">
import { measureName, measureMemory } from './util.js';
import { createRoot, createElement as h } from 'framework';
const state = {
msg: 'hello',
list: new Array(1000).fill(0).map((_, i) => ({
i,
text: 'foobar' + i
}))
};
let counter = 0;
function App() {
return h(
'div',
{ id: 'app' },
h('p', null, '> ', ++counter, ' <'),
h('p', null, state.msg),
...state.list.map((obj, i) =>
h(
'div',
{ key: i, title: state.msg + i },
h('span', { className: state.msg }, obj.text),
h('span', { className: 'baz' }, 'one'),
h('span', { className: 'qux' }, 'two'),
h(
'div',
null,
h('span', { className: 'qux' }, 'three'),
h('span', { className: 'qux' }, 'four'),
h('span', { className: 'baz' }, 'five'),
h(
'div',
null,
h('span', { className: 'qux' }, 'six'),
h('span', { className: 'baz' }, 'seven'),
h('span', { className: state.msg }, 'eight')
)
)
)
)
);
}
const root = createRoot(document.getElementById('root'));
// const p = performance.now();
root.render(h(App));
// console.log(`mount: ${(performance.now() - p).toFixed(2)}ms`);
// const patchResults = [];
function runPatch() {
// const s = performance.now();
state.msg = state.msg === 'hello' ? 'bye' : 'hello';
state.list[0].text = state.msg;
root.render(h(App));
// patchResults.push(performance.now() - s);
}
async function warmup() {
// const count = 100;
const count = 25;
for (let i = 0; i < count; i++) {
runPatch();
await new Promise(r => requestAnimationFrame(r));
}
// let fastest = Infinity;
// const total = patchResults.reduce((all, cur) => {
// if (cur < fastest) {
// fastest = cur;
// }
// return all + cur;
// }, 0);
// console.log(`${count} runs average: ${(total / count).toFixed(2)}ms`);
// console.log(`fastest run: ${fastest.toFixed(2)}ms`);
}
warmup().then(async () => {
performance.mark('start');
runPatch();
await new Promise(r => requestAnimationFrame(r));
performance.mark('stop');
performance.measure(measureName, 'start', 'stop');
measureMemory();
});
</script>
</body>
</html>
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