<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.blue{
background: #ccf;
color:#339;
}
.pink{
background: #af3;
color: #a62;
}
.dark{
background: #111;
color: #eee;
}
</style>
</head>
<body>
<select name="" id="slt">
<option value="">请选则</option>
<option value="blue">湛蓝天空</option>
<option value="pink">芭比公主</option>
<option value="dark">杀马特</option>
</select>
<script>
ifBg()
function ifBg(){
var val=localStorage['bg'];
if (val){
document.body.className=val;
}
}
var slt=document.getElementById('slt');
slt.onchange=function(){
//选择的value
// console.log(this.value)
//获取用户选择option在列表中是第几项
var n=this.selectedIndex;
if (n=='1'){
document.body.className='blue';
localStorage['bg']='blue'
}else if(n=='2'){
document.body.className='pink';
localStorage['bg']='pink'
}else if(n=='3'){
document.body.className='dark';
localStorage['bg']='dark'
}
console.log(this.selectedIndex)
}
</script>
</body>
</html>