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let timer;
let 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 {
}
} 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;