JSP用到一個下拉框 頁面刷新後，保持選中的值

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<script type="text/javascript">     function setCookie(name, value) {         var exp = new Date();         exp.setTime(exp.getTime() + 24 * 60 * 60 * 1000);         document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();     }     function getCookie(name)     {         var regExp = new RegExp("(^| )" + name + "=([^;]*)(;|$)");         var arr = document.cookie.match(regExp);         if (arr == null) {             return null;         }         return unescape(arr[2]);     } </script> <select id="select_1" onclick="setCookie('select_1',this.selectedIndex)">     <option value="apple">apple</option>     <option value="banana">banana</option>     <option value="cake">cake</option> </select> <script type="text/javascript">     var selectedIndex = getCookie("select_1");     if(selectedIndex != null) {         document.getElementById("select_1").selectedIndex = selectedIndex;     } </script>

用JS把選擇值存入COOKIE，然後載入頁面的時候取出值即可。