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javascript函数防抖 #10

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gaowei1012 opened this issue Feb 19, 2019 · 0 comments

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gaowei1012 commented Feb 19, 2019

防抖 (debounce): 将多次高频操作优化为只在最后一次执行，通常使用的场景是：用户输入，只需再输入完成后做一次输入校验即可。

// 将多高频次操作优化为最后一次执行, 优化性能
function debounc(fn, wait, immediate) {
	let timer = null;

	return function () {
		let args = arguments;
		let context = this;

		if (immediate && !timer) {
			fn.apply(context, args);
		}

		if (timer) clearTimeout(timer);
		timer = setTimeout(() => {
			fn.apply(context, args);
		}, wait);
	};
};

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