handWritingJS/test.html at master · ShuchenEason/handWritingJS · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* .square {
            width: 20%;
            height: 0;
            padding-top: 20%;
            background: orange;
        } */
        .square {
            width: 30%;
            overflow: hidden;
            background: yellow;
        }

        .square::after {
            content: '';
            display: block;
            margin-top: 100%;
        }
    </style>
</head>

<body>
    <div class="square"></div>
    <button id="throttle">点我节流！</button>
    <script>
        var n = 100

        function foo() {
            console.log(n)
            return
            var n = 100//undefined
        }

        foo()
    </script>

    <script>
        window.onload = function () {
            // 1、获取按钮，绑定点击事件
            var myThrottle = document.getElementById("throttle");
            myThrottle.addEventListener("click", throttle(sayThrottle, 3000));
        }

        // 2、节流函数体
        const throttle = function (func, delay) {
            let flag = true

            return function (...args) {
                if (!flag) return

                flag = false

                setTimeout(() => {
                    func.apply(this, args)
                    flag = true
                }, delay)

            }
        }

        // 3、需要节流的事件
        function sayThrottle() {
            console.log("节流成功！");
        }

    </script>
</body>

</html>