mouseenter 鼠标事件
- 当鼠标移动到元素上时就会触发 mouseenter 事件
- 类似 mouseover，它们两者事件的差别是
- mouseover 鼠标经过自身盒子会触发，经过子盒子还会触发，mouseenter 只会经过自身盒子触发
- 之所以这样，就是因为mouseenter不会冒泡
- 跟 mouseenter 搭配鼠标离开 mouseleave 同样不会冒泡
栗子：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.father {
width: 200px;
height: 200px;
background-color: pink;
}
.son {
width: 100px;
height: 100px;
background-color: aqua;
}
</style>
</head>
<body>
<div class="father">
<div class="son"></div>
</div>
<script>
var father = document.querySelector('.father');
var son = document.querySelector('son');
// father.addEventListener('mouseover', function() {
// console.log(11);
// })
father.addEventListener('mouseenter', function() {
console.log(11);
})
</script>
</body>
</html>