<!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>小项目（冒泡事件的使用）</title>
<style>
*{margin: 0; padding: 0;}
#div{
width: 100%;
height: 400px;
border: 1px solid black;
}
li{
width: 60px;
height: 20px;
border-radius: 10px/10px;
text-align: center;
float: left;
margin-left: 5px;
list-style: none;
cursor: default;
}
#ul{margin: 0;}
#ul>li:first-child{
background: red;
}
#ul>li:first-child+li{
background: green;
}
#ul>li:last-child{
background: blue;
}
</style>
</head>
<body>
<div id="div"></div>
<ul id="ul">
<li>红色</li>
<li>绿色</li>
<li>蓝色</li>
</ul>
<script>
var div=document.getElementById("div");//获取div
var ul=document.getElementById("ul");//获取ul
//给ul绑定点击事件
ul.addEventListener("click",function(){
var li=event.target;//将事件源赋值给变量li
//判断li的内容
if (li.innerHTML=="红色"){
div.style.background="red";
}else if (li.innerHTML=="绿色"){
div.style.background="green";
}else{
div.style.background="blue";
}
})
</script>
</body>
</html>
