You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

31 lines
871 B
JavaScript

This file contains ambiguous Unicode characters!

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

let timer; let
flag
/**
* 节流原理:在一定时间内,只能触发一次
*
* @param {Function} func 要执行的回调函数
* @param {Number} wait 延时的时间
* @param {Boolean} immediate 是否立即执行
* @return null
*/
function throttle(func, wait = 500, immediate = true) {
if (immediate) {
if (!flag) {
flag = true
// 如果是立即执行则在wait毫秒内开始时执行
typeof func === 'function' && func()
timer = setTimeout(() => {
flag = false
}, wait)
}
} else if (!flag) {
flag = true
// 如果是非立即执行则在wait毫秒内的结束处执行
timer = setTimeout(() => {
flag = false
typeof func === 'function' && func()
}, wait)
}
}
export default throttle