防抖节流 附带vue防抖节流实例（防抖会先触发再防抖） 

<html>

<head>
  <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
  <style>
    #onMouseover {
      width: 400px;
      height: 400px;
      background-color: #eee;
    }
  </style>
</head>
<div id="onMouseover"></div>

<body>
  <script>

    function count() {
      console.log(1)
    }
    // 防抖 先立即执行，再等2秒
    function debounce(func, wait) {
      let timeout
      return function () {
        if (timeout) { clearTimeout(timeout) }
        let callNow = !timeout
        timeout = setTimeout(() => {
          timeout = null
        }, wait)
        if (callNow) {
          func.apply(this)
        }
      }
    }
    const onMouseDiv = document.getElementById("onMouseover")
    // onMouseDiv.onmousemove = debounce(count, 2000)
    // wait时间后执行
    export const debounceWait = (func, wait = 200) => {
      let timer = null;
      return function () {
        if (timer) clearTimeout(timer)
        timer = setTimeout(() => {
          func.apply(this, arguments);
          timer = null
        }, wait)
      }
    }

    // 节流 通过setTimeout
    // function throttle(func, wait) {
    //     let timeout
    //     return function () {
    //         if (!timeout) {
    //             timeout = setTimeout(() => {
    //                 timeout = null
    //                 func.apply(this)
    //             }, wait)
    //         }
    //     }
    // }
    // 节流 通过时间长，使用移动端
    function throttle(func, wait) {
      let prev = 0
      return function () {
        let now = Date.now()
        if (now - prev > wait) {
          func.apply(this)
          prev = now
        }
      }
    }
    onMouseDiv.onmousemove = throttle(count, 2000)
  </script>
</body>

</html>

 

//第一步：vue中使用防抖节流，公用js库语法。
export const debounce = (func, wait) => {
  let timeout;
  return function () {
    if (timeout) { clearTimeout(timeout); }
    const callNow = !timeout;
    timeout = setTimeout(() => {
      timeout = null;
    }, wait);
    if (callNow) {
      func.apply(this);
    }
  };
};
export const throttle = (func, wait) => {
  let prev = 0;
  return function () {
    const now = Date.now();
    if (now - prev > wait) {
      func.apply(this);
      prev = now;
    }
  };
};
//第二步 vue页面中使用防抖、节流方法
import { debounce, throttle } from '@/components/debounceThrottle/index';
test: debounce(function() {
    this.pay();
}, 1000),
pay() {
    console.log('pay');
}

 

posted @ 2020-08-17 10:38  问问大将军  阅读(359)  评论(0)    收藏  举报