1、mouseover与mouseenter
In common :
When both are no children, the behavior of both is the same, but both the internal child elements, the behavior is different.
Different points:
mouseover event: whether the mouse pointer enters the selected element or its child elements, will trigger its parent mouseover event. mouseenter event: only when the mouse pointer enters the selected elements to trigger mouseenter event.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
#box1 {
width:200px;
height: 200px;
background-color: aquamarine;
}
#box2 {
width:200px;
height: 200px;
background-color: brown;
}
#ch1 {
width:150px;
height: 100px;
background-color:cornsilk;
margin: 0 auto;
}
#ch2 {
width:150px;
height: 100px;
background-color:darkgrey;
margin: 0 auto;
}
</style>
</head>
<body>
<div id="box1">
<div id="ch1"></div>
</div>
<div id="box2">
<div id="ch2"></div>
</div>
<script>
var box1 = document.getElementById('box1');
var box2 = document.getElementById('box2');
var ch1 = document.getElementById('ch1');
var ch2 = document.getElementById('ch2');
var a = 1;
var b = 1;
var c = 1;
var d = 1;
function fnb1(){
ch1.innerText = '父节点mouseover次数' + ++a + "\n" +'子节点mouseover次数'+ c;
}
function fnb2(){
ch2.innerText = '父节点mouseenter次数' + ++b + "\n" +'子节点mouseenter次数'+ d;
}
function fnc1(){
ch1.innerText = '父节点mouseover次数' + a + "\n" +'子节点mouseover次数'+ ++c;
}
function fnc2(){
ch2.innerText = '父节点mouseenter次数' + b + "\n" +'子节点mouseenter次数'+ ++d;
}
box1.addEventListener('mouseover', fnb1,false)
box2.addEventListener('mouseenter', fnb2,false)
ch1.addEventListener('mouseover', fnc1,false)
ch2.addEventListener('mouseenter', fnc2,false)
</script>
</body>
</html>
Page is shown below:
2、mouseout和mouseleave
Common:
When both are no children, the behavior of both is the same, but both the internal child elements, the behavior is different.
Different points:
mouseout events: whether the mouse pointer leaves the selected element or any child elements, will trigger mouseout event.
mouseleave event: Only the selected elements in the mouse pointer leaves, will trigger mouseleave event.
And the effect here is not the same as the above demo code.
