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说说 JavaScript 中函数的防抖 (Debounce) 与节流 (Throttle)
source link: https://juejin.im/post/5d07a51b5188254dd63c21ce
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为何要防抖和节流 有时候会在项目开发中频繁地触发一些事件,如 resize、 scroll、 keyup、 keydown等，或者诸如输入框的实时搜索功能，我们知道如果事件处理函数无限制调用，会大大加重浏览器的工作量，有可能导致页面卡顿影响体验；后台接口的频繁
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