<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
</head>
<body>
<div style="width:300px;border:#FF0000 solid 1px;">
<div style="width:200px; float:left; position:relative;border:#000000 solid 1px; clear:left">
<p>此處顯示</p>
<p>新 Div 標籤的</p>
<p>內容</p>
</div>
<div style="width:80px; float:left; position:relative;border:#0000CC solid 1px; clear:right">此處顯示新 Div 標籤的內容</div>
</div>
</body>
</html>
在網上搜尋一下發現有同樣問題的人還挺多，給的方法也很多，有用JS的，有用HEIGHT=100%的，我感覺都沒有作用。
我在下面加了一個
<div style="clear:both"></div>
加完後代碼是：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
</head>
<body>
<div style="width:300px;border:#FF0000 solid 1px;">
<div style="width:200px; float:left; position:relative;border:#000000 solid 1px; clear:left">
<p>此處顯示</p>
<p>新 Div 標籤的</p>
<p>內容</p>
</div>
<div style="width:80px; float:left; position:relative;border:#0000CC solid 1px; clear:right">此處顯示新 Div 標籤的內容</div>
<div style="clear:both"></div>
</div>
</body>
</html>
這樣就可以解決問題了。
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