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防抖和节流的应用场景有哪些 #33

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suukii opened this issue Jul 27, 2020 · 0 comments

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JavaScript performance

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suukii commented Jul 27, 2020

防抖

防抖是为了避免把一次事件误认为是多次，重在清零(clearTimeout)，单位时间内事件重复触的话计时器会被重置。

登录、发信息等按钮避免用户点击太快导致发送了多次请求，需要防抖
调整浏览器窗口大小时，为避免 resize 事件触发过于频繁造成计算过多，需要用到防抖
文本编辑器实时保存时，当无任何更改操作一秒后进行保存，这个需求可以用防抖来实现

节流

节流是控制事件发生的频率，比如控制事件发生频率为 1s，那么即使在 1s 内多次触发了事件，我们都当作它只发生了 1 次，单位时间内事件重复触发的话也只会被处理一次。

scroll 事件，使用节流每隔 1 s 才计算位置信息之类的
浏览器播放事件，每秒进行一次进度信息的计算
input 框实时搜索并发送请求展示下拉列表，每隔 1 s 发送一次请求(也可以做防抖)

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suukii added performance JavaScript labels

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