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10 months ago
let timeoutArr = [];
let flagArr = [];
/**
* 节流函数
* 节流原理在一定时间内只能触发一次
* @param {Function} fn 要执行的回调函数
* @param {Number} time 延时的时间
* @param {Boolean} isImmediate 是否立即执行
* @param {String} timeoutName 定时器ID
* @return null
*/
function throttle(fn, time = 500, isImmediate = true, timeoutName = "default") {
if(!timeoutArr[timeoutName]) timeoutArr[timeoutName] = null;
if (isImmediate) {
if (!flagArr[timeoutName]) {
flagArr[timeoutName] = true;
// 如果是立即执行,则在time毫秒内开始时执行
if(typeof fn === 'function') fn();
timeoutArr[timeoutName] = setTimeout(() => {
flagArr[timeoutName] = false;
}, time);
}
} else {
if (!flagArr[timeoutName]) {
flagArr[timeoutName] = true;
// 如果是非立即执行,则在time毫秒内的结束处执行
timeoutArr[timeoutName] = setTimeout(() => {
flagArr[timeoutName] = false;
if(typeof fn === 'function') fn();
}, time);
}
}
};
export default throttle