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template.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="preload" href="https://fonts.gstatic.com/s/longcang/v5/LYjAdGP8kkgoTec8zkRgqHAtXN-dRp6ohF_hzzTtOcBgYoCKmPpHHEBiM6LIGv3EnKLjtw.119.woff2" as="font" crossorigin="anonymous"/>
<link rel="preload" href="https://fonts.gstatic.com/s/longcang/v5/LYjAdGP8kkgoTec8zkRgqHAtXN-dRp6ohF_hzzTtOcBgYoCKmPpHHEBiM6LIGv3EnKLjtw.118.woff2" as="font" crossorigin="anonymous"/>
<link rel="preload" href="https://fonts.gstatic.com/s/longcang/v5/LYjAdGP8kkgoTec8zkRgqHAtXN-dRp6ohF_hzzTtOcBgYoCKmPpHHEBiM6LIGv3EnKLjtw.116.woff2" as="font" crossorigin="anonymous"/>
<!-- <link rel="prefetch" href="https://fonts.gstatic.com/s/longcang/v5/LYjAdGP8kkgoTec8zkRgqHAtXN-dRp6ohF_hzzTtOcBgYoCKmPpHHEBiM6LIGv3EnKLjtw.113.woff2" as="font"/>
<link rel="prefetch" href="https://fonts.gstatic.com/s/longcang/v5/LYjAdGP8kkgoTec8zkRgqHAtXN-dRp6ohF_hzzTtOcBgYoCKmPpHHEBiM6LIGv3EnKLjtw.118.woff2" as="font"/>
<link rel="prefetch" href="https://fonts.gstatic.com/s/longcang/v5/LYjAdGP8kkgoTec8zkRgqHAtXN-dRp6ohF_hzzTtOcBgYoCKmPpHHEBiM6LIGv3EnKLjtw.117.woff2" as="font"/>
-->
<!-- <link rel="dns-prefetch" href="https://ss1.bdstatic.com" />
<link rel="dns-prefetch" href="https://ss0.bdstatic.com" />
<link rel="dns-prefetch" href="https://timgsa.baidu.com" />
<link rel="dns-prefetch" href="https://ss2.bdstatic.com" /> -->
<!--引入工具库-->
<style>
body {
margin: 0;
}
#loadding {
position: fixed;
top: 0;
bottom: 0;
display: flex;
width: 100%;
align-items: center;
justify-content: center;
}
#loadding > span {
display: inline-block;
width: 8px;
height: 100%;
margin-right: 5px;
border-radius: 4px;
-webkit-animation: load 1.04s ease infinite;
animation: load 1.04s ease infinite;
}
@keyframes load {
0%,100%{
height: 40px;
background: #98BEFF;
}
50%{
height: 60px;
margin-top: -20px;
background: #3E7FEE;
}
}
</style>
<title>前端性能优化</title>
</head>
<body>
<!-- <img src="./img/index.jpg" sizes="100vw" srcset="./img/me0.jpg 300w, ./img/dog.jpg 800w, ./img/index.jpg 1200w"/> -->
<div id="loadding">
<span></span>
<span style="animation-delay:0.13s;"></span>
<span style="animation-delay:0.26s;"></span>
<span style="animation-delay:0.39s;"></span>
<span style="animation-delay:0.52s;"></span>
</div>
<div id="main">
</div>
<!-- <script src="/libs/lodash.js"></script> -->
<script src="/libs/fastdom.min.js"></script>
</body>
<script>
window.addEventListener('DOMContentLoaded', () => {
const $loadding = document.getElementById('loadding');
if (!$loadding) {
return;
}
$loadding.style.display = 'none';
$loadding.parentNode.removeChild($loadding);
});
// 连续触发页面回流操作
// let cards = document.getElementsByTagName("img");
// const update = (timestamp) => {
// for (let i = 0; i <cards.length; i++) {
// let top = cards[i].offsetTop;
// cards[i].style.width = ((Math.sin(cards[i].offsetTop + timestamp / 100 + 1) * 500) + 'px')
// }
// window.requestAnimationFrame(update)
// }
// // const update = (timestamp) => {
// // for (let i = 0; i < cards.length; i++) {
// // fastdom.measure(() => {
// // let top = cards[i].offsetTop;
// // fastdom.mutate(() => {
// // cards[i].style.width =
// // Math.sin(top + timestamp / 100 + 1) * 500 + "px";
// // });
// // });
// // }
// // window.requestAnimationFrame(update);
// // };
// update(1000);
// rAF 处理一些高频事件
// let cards = document.getElementsByTagName("img");
// const changeWidth = (pos) => {
// for (let i = 0; i <cards.length; i++) {
// cards[i].style.width = ((Math.sin(pos/100) * 500) + 'px')
// }
// }
// let ticking = false;
// window.addEventListener("pointermove", (e) => {
// let pos = e.clientX;
// // if(ticking) return;
// // ticking = true;
// // window.requestAnimationFrame(() => {
// // changeWidth(pos);
// // ticking = false;
// // })
// // changeWidth(pos)
// })
let vEvent = "visibilitychange";
if (document.webkitHidden != undefined) {
vEvent = "webkitvisibilitychange";
}
function visibilityChanged() {
if (document.hidden || document.webkitHidden) {
document.title = "客官，别走啊~";
console.log("Web page is hidden.");
} else {
document.title = "客官，你又回来了呢~";
console.log("Web page is visible.");
}
}
// document.addEventListener(vEvent, visibilityChanged, false);
// 观察长任务
// const observer = new PerformanceObserver((list) => {
// for (const entry of list.getEntries()) {
// console.log(entry)
// }
// })
// observer.observe({entryTypes: ['longtask']})
// 计算DOMContentLoaded时间
// window.addEventListener('DOMContentLoaded', (event) => {
// // Time to Interactive
// let timing = performance.getEntriesByType('navigation')[0];
// console.log(timing.domInteractive);
// console.log(timing.fetchStart);
// let diff = timing.domInteractive - timing.fetchStart;
// console.log("TTI: " + diff);
// })
// 监听网络变化
// var connection = navigator.connection || navigator.mozConnection || navigator.webkitConnection;
// var type = connection.effectiveType;
// function updateConnectionStatus() {
// console.log("Connection type changed from " + type + " to " + connection.effectiveType);
// type = connection.effectiveType;
// }
// connection.addEventListener('change', updateConnectionStatus);
</script>
</html>