JSP用到一个下拉框 页面刷新后，保持选中的值

<code class="java string">"text/javascript"</code> <code class="java plain">></code> </div> <div class="line number2 index1 alt1"> <code class="java spaces">    </code> <code class="java plain">function setCookie(name, value) {</code> </div> <div class="line number3 index2 alt2"> <code class="java spaces">        </code> <code class="java plain">var exp = </code> <code class="java keyword">new</code> <code class="java plain">Date();</code> </div> <div class="line number4 index3 alt1"> <code class="java spaces">        </code> <code class="java plain">exp.setTime(exp.getTime() + </code> <code class="java value">24</code> <code class="java plain">* </code> <code class="java value">60</code> <code class="java plain">* </code> <code class="java value">60</code> <code class="java plain">* </code> <code class="java value">1000</code> <code class="java plain">);</code> </div> <div class="line number5 index4 alt2"> <code class="java spaces">        </code> <code class="java plain">document.cookie = name + </code> <code class="java string">"="</code> <code class="java plain">+ escape(value) + </code> <code class="java string">";expires="</code> <code class="java plain">+ exp.toGMTString();</code> </div> <div class="line number6 index5 alt1"> <code class="java spaces">    </code> <code class="java plain">}</code> </div> <div class="line number7 index6 alt2"> <code class="java spaces">    </code> <code class="java plain">function getCookie(name)</code> </div> <div class="line number8 index7 alt1"> <code class="java spaces">    </code> <code class="java plain">{</code> </div> <div class="line number9 index8 alt2"> <code class="java spaces">        </code> <code class="java plain">var regExp = </code> <code class="java keyword">new</code> <code class="java plain">RegExp(</code> <code class="java string">"(^| )"</code> <code class="java plain">+ name + </code> <code class="java string">"=([^;]*)(;|$)"</code> <code class="java plain">);</code> </div> <div class="line number10 index9 alt1"> <code class="java spaces">        </code> <code class="java plain">var arr = document.cookie.match(regExp);</code> </div> <div class="line number11 index10 alt2"> <code class="java spaces">        </code> <code class="java keyword">if</code> <code class="java plain">(arr == </code> <code class="java keyword">null</code> <code class="java plain">) {</code> </div> <div class="line number12 index11 alt1"> <code class="java spaces">            </code> <code class="java keyword">return</code> <code class="java keyword">null</code> <code class="java plain">;</code> </div> <div class="line number13 index12 alt2"> <code class="java spaces">        </code> <code class="java plain">}</code> </div> <div class="line number14 index13 alt1"> <code class="java spaces">        </code> <code class="java keyword">return</code> <code class="java plain">unescape(arr[</code> <code class="java value">2</code> <code class="java plain">]);</code> </div> <div class="line number15 index14 alt2"> <code class="java spaces">    </code> <code class="java plain">}</code> </div> <div class="line number16 index15 alt1"> <code class="java plain">
"select_1" onclick= "setCookie('select_1',this.selectedIndex)" >      "apple" >apple      "banana" >banana      "cake" >cake
    "apple" >apple
    "banana" >banana
    "cake" >cake

<code class="java string">"text/javascript"</code> <code class="java plain">></code> </div> <div class="line number23 index22 alt2"> <code class="java spaces">    </code> <code class="java plain">var selectedIndex = getCookie(</code> <code class="java string">"select_1"</code> <code class="java plain">);</code> </div> <div class="line number24 index23 alt1"> <code class="java spaces">    </code> <code class="java keyword">if</code> <code class="java plain">(selectedIndex != </code> <code class="java keyword">null</code> <code class="java plain">) {</code> </div> <div class="line number25 index24 alt2"> <code class="java spaces">        </code> <code class="java plain">document.getElementById(</code> <code class="java string">"select_1"</code> <code class="java plain">).selectedIndex = selectedIndex;</code> </div> <div class="line number26 index25 alt1"> <code class="java spaces">    </code> <code class="java plain">}</code> </div> <div class="line number27 index26 alt2"> <code class="java plain">

用JS把选择值存入COOKIE，然后载入页面的时候取出值即可。