js控制页面自动刷新，可设置时间间隔

<input type="button" class="btn mlw" value="开启自动刷新" id="controlRefresh" />
<select name="time" id="time">
<option value="5000">5秒</option>
<option value="10000">10秒</option>
<option value="15000" selected="selected">15秒</option>
<option value="30000">30秒</option>
<option value="60000">一分钟</option>
</select>

$(function(){
$('#controlRefresh').click(function(){
if($(this).val()=="关闭自动刷新"){
$(this).val("开启自动刷新");
}else{
$(this).val("关闭自动刷新");
}
})
$('#time').change(function(){
var time = $(this).val();
setCookie('refreshTime',time);
})
})
function setCookie(name,value) {//两个参数，一个是cookie的名子，一个是值
var Days = 30; //此 cookie 将被保存 30 天
var date = new Date();    //new Date("December 31, 9998");
date.setTime(date.getTime() + Days*24*60*60*1000);
document.cookie = name + "="+ escape (value) + ";expires=" + date.toGMTString();
}

function getCookie(name) {//取cookies函数
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
if(arr != null) return unescape(arr[2]); return null;
}

function controlRefresh(ele)
{
var eleTemp = $('#controlRefresh').val();
if(eleTemp=="开启自动刷新"){
//var time = parseInt($('#time').val())-4999;
var time =     parseInt(getCookie('refreshTime'))?parseInt(getCookie('refreshTime'))-5000:10000;
setTimeout('myrefresh()',time);
}
}
//执行刷新
function myrefresh()
{
var eleTemp = $('#controlRefresh').val();
if(eleTemp=="开启自动刷新") window.location.reload();
}
setInterval('controlRefresh()',5000);