用JavaScript怎么实现页面跳转

</pre><pre id="best-content-940665496" class="best-text mb-10" accuse="aContent">第一种：    <script language="javascript" type="text/javascript">           window.location.href="login.jsp?backurl="+window.location.href;     </script><img id="selectsearch-icon" class="selectsearch-hide" alt="搜索" src="http://img.baidu.com/img/iknow/qb/select-search.png" />第二种：    <script language="javascript">alert("返回");window.history.back(-1);   </script>第三种：   <script language="javascript">window.navigate("top.jsp");  </script>第四种：   <script language="JavaScript">          self.location='top.htm';   </script>第五种：   <script language="javascript">          alert("非法访问！");          top.location='xx.jsp';   </script>