// 防抖
export const debounce = (func, wait = 3000, immediate = true) => {
 let timeout = null;
 return function() {
  let context = this;
  let args = arguments;
  if (timeout) clearTimeout(timeout);
  if (immediate) {
   var callNow = !timeout; //点击第一次为true 时间内点击第二次为false 时间结束则重复第一次
   timeout = setTimeout(() => {
    timeout = null;
   }, wait); //定时器ID
   if (callNow) func.apply(context, args);
  } else {
   timeout = setTimeout(function() {
    func.apply(context, args);
   }, wait);
  }
 };
};
// 时间戳方案
export const throttleTime = (fn, wait = 2000) => {
 var pre = Date.now();
 return function() {
  var context = this;
  var args = arguments;
  var now = Date.now();
  if (now - pre >= wait) {
   fn.apply(context, args);
   pre = Date.now();
  }
 };
};
// 定时器方案
export const throttleSetTimeout = (fn, wait = 3000) => {
 var timer = null;
 return function() {
  var context = this;
  var args = arguments;
  if (!timer) {
   timer = setTimeout(function() {
    fn.apply(context, args);
    timer = null;
   }, wait);
  }
 };
};

<template>
 <div class="main">
  <p>防抖立即执行</p>
  <button @click="click1">点击</button>

  <br />

  <p>防抖不立即执行</p>
  <button @click="click2">点击</button>

  <br />

  <p>节流时间戳方案</p>
  <button @click="click3">点击</button>

  <br />

  <p>节流定时器方案</p>
  <button @click="click4">点击</button>
 </div>
</template>

<script>
import { debounce, throttleTime, throttleSetTimeout } from './utils';
export default {
 methods: {
  click1: debounce(
   function() {
    console.log('防抖立即执行');
   },
   2000,
   true
  ),
  click2: debounce(
   function() {
    console.log('防抖不立即执行');
   },
   2000,
   false
  ),
  click3: throttleTime(function() {
   console.log('节流时间戳方案');
  }),
  click4: throttleSetTimeout(function() {
   console.log('节流定时器方案');
  })
 },
};
</script>

<style scoped lang="scss">
* {
 margin: 0;
 font-size: 20px;
 user-select: none;
}
.main {
 position: absolute;
 left: 50%;
 transform: translateX(-50%);
 width: 500px;
}
button {
 margin-bottom: 100px;
}
</style>