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huazhiyu/node_modules/uview-ui/libs/function/debounce.js

29 lines
968 B

let timeout = null
/**
* 防抖原理:一定时间内,只有最后一次操作,再过wait毫秒后才执行函数
*
* @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 debounce(func, wait = 500, immediate = false) {
// 清除定时器
if (timeout !== null) clearTimeout(timeout)
// 立即执行,此类情况一般用不到
if (immediate) {
const callNow = !timeout
timeout = setTimeout(() => {
timeout = null
}, wait)
if (callNow) typeof func === 'function' && func()
} else {
// 设置定时器,当最后一次操作后,timeout不会再被清除,所以在延时wait毫秒后执行func回调方法
timeout = setTimeout(() => {
typeof func === 'function' && func()
}, wait)
}
}
export default debounce