代碼如下：<!DOCTYPE?html>
<html>
<head>
????<meta?charset="UTF-8">
????<title>box-html</title>
????<style?type="text/css">
????*?{
????????margin:?0;
????????padding:?0;
????}
????#body-box?{
????????width:?700px;
????????height:?500px;
????????background-color:?#FF00FF;
????????/*overflow:hidden;*/
????}
????.box-style?{
????????width:?500px;
????????height:?300px;
????????border:?10px?dashed?black;
????????background-color:?red;
????????margin:?10px?0?0?20px;
????????padding:?10px?10px?10px?10px;
????}
????</style>
</head>
<body>
??<div?id="body-box">
????<div?class="box-style">你好，可以說(shuō)說(shuō)?BFC?相關(guān)特性嗎？或者有什么學(xué)習(xí)資料供參閱，謝謝</div>
??</div>
</body>
</html>產(chǎn)生上邊距的原因是什么？為什么在#body-box添加overflow：hidden就沒(méi)事了？
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