js cookie的封装和调用

<script>
function setCookie(cname,cvalue,exdays){
var d = new Date();
d.setTime(d.getTime()+(exdays*24*60*60*1000));
var expires = "expires="+d.toGMTString();
document.cookie = cname+"="+cvalue+"; "+expires;
}
function getCookie(cname){
var name = cname + "=";
var ca = document.cookie.split(‘;‘);
for(var i=0; i<ca.length; i++) {
var c = ca[i].trim();
if (c.indexOf(name)==0) return c.substring(name.length,c.length);
}
return "";
}
function checkCookie(){
var telephone=getCookie("telephone");
if (telephone!=""){
alert("Welcome again " + telephone);
}
else {
telephone = $("#telephone").val();
if (telephone!="" && telephone!=null){
setCookie("telephone",telephone,60);
}
}
}
</script>