移动端click事件300ms延迟

问题

在移动端中，点击屏幕的按钮会产生200~300ms的延迟响应，会导致用户认为页面卡顿问题。

如下：

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><meta http-equiv="X-UA-Compatible" content="IE=edge" /><title>click事件300ms延迟</title><style>#btn {width: 100%;height: 300px;font-size: 100px;}</style></head><body><button id="btn">点击</button><script>let btn = document.getElementById("btn");btn.addEventListener("touchstart", () => {console.time("click");});btn.addEventListener("click", () => {console.timeEnd("click");console.log("点击了");});</script></body>
</html>

在这里插入图片描述

原因

原因是在移动端下，浏览器会做双加缩放检测（double-tap to zoom）。

解决

将click事件放在touchstart或touchend中处理

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><meta http-equiv="X-UA-Compatible" content="IE=edge" /><title>click事件300ms延迟</title><style>#btn {width: 100%;height: 300px;font-size: 100px;}</style></head><body><button id="btn">点击</button><script>let btn = document.getElementById("btn");btn.addEventListener("touchstart", () => {});btn.addEventListener("touchend", () => {console.log("点击了");});</script></body>
</html>

禁止双击缩放

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><meta http-equiv="X-UA-Compatible" content="IE=edge" /><metaname="viewport"content="width=device-width, initial-scale=1.0, minimum-scale=1,maximum-scale=1, user-scalable=no" /><title>click事件300ms延迟</title><style>#btn {width: 100%;height: 300px;font-size: 100px;}</style></head><body><button id="btn">点击</button><script>let btn = document.getElementById("btn");btn.addEventListener("touchstart", () => {console.time("click");});btn.addEventListener("click", () => {console.timeEnd("click");console.log("点击了");});</script></body>
</html>