使用闭包处理input框防抖问题

<div class="container">
        <div class="left">
            <p>防抖(1s内显示输入内容)</p>
            <input type="text" id="leftInput" />
            <div class='textDiv' id="textShow"></div>
        </div>
    </div>
    <script>
        // 获取元素
        let inputDom = document.querySelector('#leftInput');
        // 函数柯里化
        const debounce = (callback, delay) => {
            let timer
            return function (value) {
                //闭包内存泄漏
                clearTimeout(timer)
                timer = setTimeout(function () {
                    //执行
                    callback(value)
                }, delay)
            }
        }
        // 显示内容的函数
        function showText(value) {
            let textDom = document.querySelector('#textShow');
            console.log(value)
            textDom.innerText = value;
        }
        let debounceFunc = debounce(showText, 1000);
        inputDom.addEventListener('keyup', function (e) {
            let value = e.target.value
            debounceFunc(value)
        })
    </script>