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29 lines
940 B
29 lines
940 B
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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