防抖和节流的区别：防抖是将多次执行变为最后一次执行，节流是将多次执行变为每隔一段时间执行
防抖-定时器实现版
// 防抖 - 定时器
function debounce(fn, wait) {
var timer = null
return function() {
var context = this
var args = arguments
if(timer) {
clearTimeout(timer)
}
timer = setTimeout(fn.bind(context, args), wait)
}
}防抖-定时器参数版实现版
// 防抖-参数版
function debounce(fn, wait) {
var timer = null
return function() {
var context = this
var args = arguments
if(timer) {
clearTimeout(timer)
}
timer = setTimeout(() => { fn.apply(this, args) }, wait)
}
}节流 - 时间戳实现版
// 节流 - 时间戳
function throttle(fn, wait) {
var prev = Date.now()
return function() {
var now = Date.now()
if (now - prev > wait) {
fn()
prev = Date.now()
}
}
}节流 - 时间戳实现版
// 节流 - 定时器
function throttle(fn, wait) {
var timer = null
return function() {
if (!timer) {
timer = setTimeout(() => {
timer = null
fn()
}, wait)
}
}
}示例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>防抖、节流</title>
</head>
<body>
<input type="text" id="input">
<button id="button">提交</button>
</body>
</html>
<script>
// 防抖 - 定时器
function debounce(fn, wait) {
var timer = null
return function() {
if(timer) {
clearTimeout(timer)
}
timer = setTimeout(fn.bind(this, this.value), wait)
}
}
function checked(value) {
console.log(value)
}
document.getElementById('input').addEventListener('input', debounce(checked, 1000))
// 防抖-参数版
// function debounce(fn, wait) {
// var timer = null
// return function() {
// var context = this
// var args = arguments
// if(timer) {
// clearTimeout(timer)
// }
// timer = setTimeout(() => { fn.apply(this, args) }, wait)
// }
// }
// 节流 - 时间戳
// function throttle(fn, wait) {
// var prev = Date.now()
// return function() {
// var now = Date.now()
// if (now - prev > wait) {
// fn()
// prev = Date.now()
// }
// }
// }
// 节流 - 定时器
function throttle(fn, wait) {
var timer = null
return function() {
if (!timer) {
timer = setTimeout(() => {
timer = null
fn()
}, wait)
}
}
}
function btnClick() {
console.log('submit')
}
document.getElementById('button').addEventListener('click', throttle(btnClick, 1000))
</script>参考
https://www.jianshu.com/p/c8b86b09daf0
https://www.cnblogs.com/youma/p/10559331.html
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