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30 lines
940 B
30 lines
940 B
3 years ago
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let timeout = null
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/**
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* 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
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*
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* @param {Function} func 要执行的回调函数
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* @param {Number} wait 延时的时间
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* @param {Boolean} immediate 是否立即执行
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* @return null
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*/
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function debounce(func, wait = 500, immediate = false) {
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// 清除定时器
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if (timeout !== null) clearTimeout(timeout)
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// 立即执行，此类情况一般用不到
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if (immediate) {
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const callNow = !timeout
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timeout = setTimeout(() => {
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timeout = null
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}, wait)
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if (callNow) typeof func === 'function' && func()
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} else {
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// 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
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timeout = setTimeout(() => {
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typeof func === 'function' && func()
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}, wait)
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}
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}
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export default debounce
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