防抖：用户触发事件过于频繁，只要最后一次事件的操作
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<input type="text" />
<script>
let inp = document.querySelector('input')
inp.oninput = debounce(function () {
console.log(this.value)
}, 500)
function debounce(fn, delay) {
let t = null
return function () {
if (t !== null) {
clearTimeout(t)
}
t = setTimeout(() => {
fn.call(this)
}, delay)
}
}
</script>
</body>
</html>
节流：控制高频事件执行次数
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
body {
height: 2000px;
}
</style>
</head>
<body>
<script>
// 节流:控制高频事件执行次数
window.onscroll = throttle(function () {
console.log(123)
}, 500)
function throttle(fn, delay) {
let flag = true
return function () {
if (flag) {
setTimeout(() => {
fn.call(this)
flag = true
}, delay)
flag = false
}
}
}
</script>
</body>
</html>
