里面的div1有那个块吗，为什么要这样写<div id="div1"></div>。
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>absolute样式</title>
<style type="text/css">
div{
width:200px;
height:200px;
border:2px red solid;
position:absolute;
right:100px;
top:100px;
}
</style>
</head>
<body>
<div id="div1"></div>
</body>
</html>
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Html/CSS