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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
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