#神仙见了会流泪之#getElementsByTagName的用法
<!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>
*{
margin: 0;
padding: 0;
list-style: none;
}
body{
width: 800px;
margin-left: auto;
margin-right: auto;
}
#city-list{
float: left;
width: 450px;
}
#inner{
width: 400px;
border-style: solid;
border-width: 1px;
margin-bottom: 10px;
padding: 10px;
float: left;
}
#inner li{
border-style: solid;
border-width: 1px;
padding: 5px;
margin: 5px;
background-color: #99ff99;
float: left;
}
#btn-l{
float: left;
}
#btn{
width: 50px;
}
</style>
<script>
window.onload = function(){
/*需求:点击按钮查找id为city下所有li节点*/
//获取btn并给btn设置单机响应函数
var btn = document.getElementById("btn")
btn.onclick = function(){
//获取id为city的元素
var city = document.getElementById("city")
//查找city下的li节点
var lis = city.getElementsByTagName("li")
for(var i = 0;i < lis.length; i++){
alert((lis[i]).innerHTML)
}
}
}
</script>
</head>
<body>
<div id="city-list" >
<div id="inner" >
<ul id="city" >
<li>北京</li>
<li>上海</li>
<li>广州</li>
<li>澳门</li>
</ul>
</div>
</div>
<div id="btn-l" >
<div ><button id="btn" >按钮</button></div>
</div>
</body>
</html>