php/js互传cookie中文乱码的问题

<?php
setcookie ("TestCookie", urlencode("这就是网页21"));
?>

<script type="text/javascript">
alert(decodeURI(getCookie("TestCookie")))
function getCookie(sName) {
var aCookie = document.cookie.split('; ');
for (var i=0; i < aCookie.length; i++) {
var aCrumb = aCookie[i].split('=');
if (sName == aCrumb[0])
return decodeURI(aCrumb[1]);
}
return '';
}
</script>

<script type="text/javascript">function setCookie(name, value, time){
var nameString = name + '=' + encodeURI(value);
var expiryString = "";
if(time !== 0) {
var expdate = new Date();
if(time == null || isNaN(time)) time = 60*60*1000;
expdate.setTime(expdate.getTime() + time);
expiryString = ' ;expires = '+ expdate.toGMTString();
}
var path = " ;path =/";
document.cookie = nameString + expiryString + path;
}setCookie("TestJsCookie", "我是中国人", 0) </script>

<?php
echo urldecode($_COOKIE["TestJsCookie"]);
?>