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                [toc] #### 1.防抖 防抖:連續點擊按鈕,只觸發最后一次事件 實現思路:設置一個公共的定時器,每次觸發事件時,先清除該定時器,然后再生成一個,這樣只會有最后一個定時器觸發 ```js const btn = document.getElementById('btn') btn.addEventListener('click', debounce(payMoney, 1000)) function payMoney(a) { console.log(a); } function debounce(func, delay) { let timer return function() { clearTimeout(timer) let context = this let args = arguments timer = setTimeout(() => { func.call(context, args) }, delay) } } ``` #### 2.節流 節流:在連續執行時間時,使事件在相同時間間隔內執行 方法1: 1.根據 setTimeout,延遲 func 執行時間為 delay 2.每次執行完后清除 timer,如果timer存在,則不執行, 該方法與防抖的區別在于,防抖每次馬上清除掉上一次的timer,不管有沒有執行,只執行最后一次,而節流在timer存在時不執行,等到方法執行完畢后再清楚timer ```js function throttle(func, delay) { let timer return function() { let context = this let args = arguments if (timer) { return } else { timer = setTimeout(() => { func.call(context, args) timer = null }, delay) } } } ``` 方法2:根據時間間隔發,記錄上一次執行的時間 用當前時間減去上一次的時間,如果大于設置的delay,那么執行 func,并且刷新上一次的時間為now ```js function throttle(func, delay) { let pre = 0 return function () { let now = new Date() let context = this let args = arguments if (now - pre > delay) { func.apply(context, arguments) pre = now } } }
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