<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
ul{
margin: 0;
padding: 0;
}
li{
list-style: none;
height: 30px;
border: 1px solid #333;
margin-top: 10px;
}
</style>
<script type="text/javascript">
window.onload = function(){
var aLi = document.getElementsByTagName('li');
// console.log(aLi);
for(var i = 0;i < aLi.length; i++){
aLi[i].index = true;
aLi[i].onclick = function(){
if(this.index){
this.style.background = 'red';
this.index = false;
}else{
this.style.background = '#fff';
this.index = true;
}
}
}
}
</script>
</head>
<body>
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</body>
</html>
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