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