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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                html ```html <div id="content" style="height:150px;line-height:150px;text-align:center; color: #fff;background-color:#ccc;font-size:80px;"></div> <script> let num = 1; let content = document.getElementById('content'); function count() { content.innerHTML = num++; }; content.onmousemove = count; </script> ``` ## 防抖(debounce) **所謂防抖,就是指觸發事件后在 n 秒內函數只能執行一次,如果在 n 秒內又觸發了事件,則會重新計算函數執行時間。** 防抖函數分為非立即執行版和立即執行版。 ### 非立即執行版: ```javascript function debounce(func, wait) { let timeout; return function () { let context = this; let args = arguments; if (timeout) clearTimeout(timeout); timeout = setTimeout(() => { func.apply(context, args) }, wait); } } ``` 使用方式 ```javascript content.onmousemove = debounce(count,1000); ``` ### 立即執行版: ```javascript function debounce(func,wait) { let timeout; return function () { let context = this; let args = arguments; if (timeout) clearTimeout(timeout); let callNow = !timeout; timeout = setTimeout(() => { timeout = null; }, wait) if (callNow) func.apply(context, args) } } ``` ### 合并版 ```javascript /** * @desc 函數防抖 * @param func 函數 * @param wait 延遲執行毫秒數 * @param immediate true 表立即執行,false 表非立即執行 */ function debounce(func,wait,immediate) { let timeout; return function () { let context = this; let args = arguments; if (timeout) clearTimeout(timeout); if (immediate) { var callNow = !timeout; timeout = setTimeout(() => { timeout = null; }, wait) if (callNow) func.apply(context, args) } else { timeout = setTimeout(function(){ func.apply(context, args) }, wait); } } } ``` ## 節流(throttle) **所謂節流,就是指連續觸發事件但是在 n 秒中只執行一次函數。**節流會稀釋函數的執行頻率。 對于節流,一般有兩種方式可以實現,分別是時間戳版和定時器版。 ### 時間戳版: ```javascript function throttle(func, wait) { let previous = 0; return function() { let now = Date.now(); let context = this; let args = arguments; if (now - previous > wait) { func.apply(context, args); previous = now; } } } ``` 使用方式 ```javascript content.onmousemove = throttle(count,1000); ``` ### 定時器版: ```javascript function throttle(func, wait) { let timeout; return function() { let context = this; let args = arguments; if (!timeout) { timeout = setTimeout(() => { timeout = null; func.apply(context, args) }, wait) } } } ``` ### 合并版: ```javascript /** * @desc 函數節流 * @param func 函數 * @param wait 延遲執行毫秒數 * @param type 1 表時間戳版,2 表定時器版 */ function throttle(func, wait ,type) { if(type===1){ let previous = 0; }else if(type===2){ let timeout; } return function() { let context = this; let args = arguments; if(type===1){ let now = Date.now(); if (now - previous > wait) { func.apply(context, args); previous = now; } }else if(type===2){ if (!timeout) { timeout = setTimeout(() => { timeout = null; func.apply(context, args) }, wait) } } } } ``` [https://github.com/mqyqingfeng/Blog/issues/22](https://github.com/mqyqingfeng/Blog/issues/22) [https://github.com/mqyqingfeng/Blog/issues/26](https://github.com/mqyqingfeng/Blog/issues/26)
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