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30 lines
871 B
30 lines
871 B
let timer; let |
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flag |
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/** |
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* 节流原理：在一定时间内，只能触发一次 |
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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 throttle(func, wait = 500, immediate = true) { |
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if (immediate) { |
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if (!flag) { |
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flag = true |
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// 如果是立即执行，则在wait毫秒内开始时执行 |
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typeof func === 'function' && func() |
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timer = setTimeout(() => { |
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flag = false |
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}, wait) |
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} |
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} else if (!flag) { |
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flag = true |
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// 如果是非立即执行，则在wait毫秒内的结束处执行 |
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timer = setTimeout(() => { |
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flag = false |
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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 throttle
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