概述
输入框中防止连续触发事件，用户输入结束或暂停时再触发
示例
const input1 = document.getElementById('input1')
let timer = null
input1.addEventListener('keyup', function () {
if (timer) {
clearTimeout(timer)
}
timer = setTimeout(() => {
// 模拟触发 change 事件
console.log(input1.value)
// 清空定时器
timer = null
}, 500)
})
const input1 = document.getElementById('input1')
// 防抖
function debounce(fn, delay = 500) {
// timer 是闭包中的
let timer = null
return function () {
if (timer) {
clearTimeout(timer)
}
timer = setTimeout(() => {
fn.apply(this, arguments)
timer = null
}, delay)
}
}
input1.addEventListener('keyup', debounce(function (e) {
console.log(e.target)
console.log(input1.value)
}, 600))