arget屬性指明在何處開啟串連的檔案有 4 個保留的目標名稱用作特殊的文檔重新導向操作：_blank瀏覽器總在一個新開啟、未命名的視窗中載入目的文件。_self這個目標的值對所有沒有指定目標的 <a> 標籤是預設目標，它使得目的文件載入並顯示在相同的架構或者視窗中作為來源文件。這個目標是多餘且不必要的，除非和文檔標題 <base> 標籤中的 target 屬性一起使用。_parent這個目標使得文檔載入父視窗或者包含來超連結引用的架構的框架組。如果這個引用是在視窗或者在頂級架構中，那麼它與目標 _self 等效。_top這個目標使得文檔載入包含這個超連結的視窗，用 _top 目標將會清除所有被包含的架構並將文檔載入整個瀏覽器視窗。
也可以自己指定：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><HTML><HEAD><TITLE>簡易書籍管理系統</TITLE><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></HEAD><frameset rows="100,*" cols="*" frameborder="NO" border="0" framespacing="0"> <frame src="pages/title.jsp" name="title" scrolling="NO" noresize> <frameset id ="_content" cols="178,*" bordercolor="#2CA6DA" BORDER = "0"> <FRAME SRC="pages/menu.jsp" NAME="tree" noresize SCROLLING="no" MARGINWIDTH=0 MARGINHEIGHT=0> <FRAME SRC="pages/about.jsp" NAME="main" noresize SCROLLING="auto" MARGINWIDTH=0 MARGINHEIGHT=0> </frameset></frameset></HTML>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><% String ctxpath = request.getContextPath();%><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>書籍管理菜單</title><link href="../css/style.css" rel="stylesheet" type="text/css" /></head><body><div class='menuDiv' style='height:96%'><table width=100%> <tr><td class='title'>功能菜單</td></tr> <tr> <td align=center> <a href="<%=ctxpath %>/book.do?method=showBookTypeList" target= "main" onclick="this.blur();" class="button"> <span>書籍類型維護</span> </a> </td> </tr> <tr> <td align=center> <a href="<%=ctxpath %>/book.do?method=showBookList" target= "main" onclick="this.blur();" class="button"> <span>書籍維護</span> </a> </td> </tr></table></div></body></html>
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