SOURCE

var i = document.querySelector('input')
        function debounce(fn,delay) {
            let timer = null
            return function() {
                clearTimeout(timer)
                // 如果绑定this，结果是input，不绑定的话是window。
                // 而且debounce返回的也不能是箭头函数，否则它的this就是debounce的this，即window
                timer = setTimeout(fn.bind(this),delay)
                // timer = setTimeout(()=>fn(),delay)
            }
        }
        function throttle(fn,delay) {
            let timer = null
            return function() {
                if (timer) return
                timer = setTimeout(()=>{
                    timer = null
                    fn.bind(this)(arguments)
                }, delay)
            }
        }
        
        function func() {
            var p = document.createElement('p')
            p.innerText = this
            document.body.appendChild(p)
        }
        i.oninput = throttle(func,1000)

<input type="text">

<input type="text">