wszhyWx/libs/function/debounce.js

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let timeout = null;
/**
* 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
*
* @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 debounce(func, wait = 500, immediate = false) {
// 清除定时器
if (timeout !== null) clearTimeout(timeout);
// 立即执行,此类情况一般用不到
if (immediate) {
var callNow = !timeout;
timeout = setTimeout(function() {
timeout = null;
}, wait);
if (callNow) typeof func === 'function' && func();
} else {
// 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
timeout = setTimeout(function() {
typeof func === 'function' && func();
}, wait);
}
}
export default debounce