<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>点击按钮更改背景颜色</title>
<style>
.body{
background-color:#fff;
}
.change{
background-color:#000;
}
</style>
</head>
<body class="body">
<button>开关按钮</button>
<script>
var button=document.querySelector("button");
var body=document.querySelector(".body");
flag=0;
button.onclick=function(){
if(flag==0){
body.className="body change";
flag=1;
}else{
body.className="body";
flag=0;
}
}
</script>
</body>
</html>版权声明：本文为qq_45902653原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接和本声明。