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防抖和节流原理分析
source link: https://juejin.im/post/5b7b88d46fb9a019e9767405
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窗口的resize、scroll、输入框内容校验等操作时，如果这些操作处理函数是较为复杂或页面频繁重渲染等操作时，在这种情况下如果事件触发的频率无限制，会加重浏览器的负担，导致用户体验非常糟糕。此时我们可以采用debounce（防抖）和throttle（节流）
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