Blog/Handwritten/test/debounce.html at master · projectcss/Blog · GitHub

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<!DOCTYPE html>
<html>

<head lang="zh-CN">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title></title>
    <style>
        .base {
            height: 200px;
            width: 200px;
            background: pink;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }

        p {
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
        }
    </style>
</head>

<body>
    <div class="base">
        <p>点击触发事件</p>
    </div>
</body>
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.11/lodash.min.js"></script>
<script>
    window.onload = function () {
        function debounce(func, wait, immediate = true) {
            let timer;
            // 延迟执行函数
            const later = (context, args) => setTimeout(() => {
                timer = null;// 倒计时结束
                if (!immediate) {
                    func.apply(context, args);
                    //执行回调
                    context = args = null;
                }
            }, wait);
            let debounced = function (...params) {
                let context = this;
                let args = params;
                if (!timer) {
                    timer = later(context, args);
                    if (immediate) {
                        //立即执行
                        func.apply(context, args);
                    }
                } else {
                    clearTimeout(timer);
                    //函数在每个等待时延的结束被调用
                    timer = later(context, args);
                }
            }
            debounced.cancel = function () {
                clearTimeout(timer);
                timer = null;
            };
            return debounced;
        };


        function handleClick(e) {
            console.log(this); //this值正确传递
            console.log(e, [...arguments].splice(1)); //参数正确传递
        }

        /*  防抖，immediate = ture 每个等待时延的开始被调用 */
        let handle = debounce(handleClick, 1000, true);
        // let handle = _.debounce(handleClick, 1000, {
        //     leading: true,
        //     trailing: false
        // });
        document.querySelector('.base').onclick = handle;
    }

</script>