防抖函数的实现

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>防抖</title>
</head>
<body>
<button id="btn">提交</button>

<script>
    /*防抖函数作用限制多长时间内只能执行一次*/
    function success (event){
        console.log('提交成功')
    }
    //防抖函数
    const debounce = (fn,delay) =>{ // 1
        let timer = null

        return (...args) => { //4
            clearTimeout(timer) //5
            timer= setTimeout(() =>{//3
                fn.apply(this,args) //6
            },delay)
        }

    }
   const oDebounce =  debounce(success,5000) //2

    let btn = document.getElementById('btn')
    btn.addEventListener('click',oDebounce)
</script>
</body>
</html>