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| /**
| * @desc 函数防抖
| * @param func 目标函数
| * @param wait 延迟执行毫秒数
| * @param immediate true - 立即执行， false - 延迟执行
| */
| export const debounce = function(func, wait = 1000, immediate = true) {
| let timer;
| console.log(1);
| return function() {
| console.log(123);
| let context = this,
| args = arguments;
| if (timer) clearTimeout(timer);
| if (immediate) {
| let callNow = !timer;
| timer = setTimeout(() => {
| timer = null;
| }, wait);
| if (callNow) func.apply(context, args);
| } else {
| timer = setTimeout(() => {
| func.apply(context, args);
| }, wait)
| }
| }
| }
| /**
| * @desc 函数节流
| * @param func 函数
| * @param wait 延迟执行毫秒数
| * @param type 1 使用表时间戳，在时间段开始的时候触发 2 使用表定时器，在时间段结束的时候触发
| */
| export const throttle = (func, wait = 1000, type = 1) => {
| let previous = 0;
| let timeout;
| return function() {
| let context = this;
| let args = arguments;
| if (type === 1) {
| let now = Date.now();
|
| if (now - previous > wait) {
| func.apply(context, args);
| previous = now;
| }
| } else if (type === 2) {
| if (!timeout) {
| timeout = setTimeout(() => {
| timeout = null;
| func.apply(context, args)
| }, wait)
| }
| }
| }
| }
|
|
