①The event of the parent element prevents the child element from triggering, and the parent element binds the event to return false.
②The child element event prevents the parent element from triggering, and the child element needs to add stopPropagation().
The following is a small case written by myself
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<title>Document</title>
<style>
#one{
width:400px;height:400px;background-color: red;}
#two{
width:200px;height:200px;background-color: green;}
#three{
width:50px;height:50px;background-color: blue;}
</style>
</head>
<body>
<div id="one">
一区
<div style="background-color: yellow;width:300px;height:300px;" id="test">子元素群
<div id="two">二区
<div id="three">三区</div>
</div>
</div>
</div>
<script>
$("#one").click(function(e){
console.log("one")
return false
})
$("#two").click(function(e){
console.log("two")
return false
})
$("#three").click(function(e){
e.stopPropagation()
console.log("three")
})
</script>
</body>
</html>
I used to be stupid thinking that the parent element will prevent events from grandchildren, great-grandchildren, but in the parent element, the child element takes the initiative e.stopPropagation(), so that the child element will not be affected by the event of the parent element.