onmouseover频繁触发问题

看到阿里云官网的东晓是使用雪碧图做的

于是想着也写一个，把图片复制来后开始写，思路就是利用onmouseover和out事件，然后使用setInterval累计他的backgroundPositionY属性，


```html
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .box {
        width: 60px;
        height: 60px;
        overflow: hidden;
        background-image: url('./deo.png');
        background-repeat: no-repeat;
        background-size: 100%;
        /* background-position-y: 0px; */
    }
</style>

<body>
    <div class="box"></div>
    <div style="background-color: red;">
        11
    </div>
</body>
<script>
    let box = document.querySelector('.box')
    // 防抖
    const debounce = (fn, time) => {
        let timeout = null
        return function () {
            clearTimeout(timeout)
            timeout = setTimeout(() => {
                fn.apply(this, arguments)
            }, time);
        }
    }
    let y = 60
    // let num = 1
    box.addEventListener('mouseover', () => {
        let num = 1
        let a = setInterval(() => {
            if (num === 20) {
                clearInterval(a);
            } else {
                num++
            }
            box.style.backgroundPositionY = -y * num + 'px';
        }, 40)
    })
    box.addEventListener('mouseout', () => {
        let num = 1
        let a = setInterval(() => {
            num++
            box.style.backgroundPositionY = -1200 + (y * num) + 'px';
            if (num == 20) {
                clearInterval(a);
            }
            console.log(num)
        }, 40)
    })
</script>

</html>

```
代码这里，但是现在有个问题，就是mouseover事件如果频繁触发的话效果会出问题，不知道有没有什么好的方法，防抖也没什么用

1、mouseover改为mouseenter试下
1）mouseover和mouseout
2）mouseenter和mouseleave

试下移入后把图片改为穿透点击 pointer-events: none;