##注意事項
1.設置domain和path，否則在同域間頁面跳轉時可能會讀取不到
~~~
document.cookie = "contractId=1111122222333; expires=Mon, 07 Dec 2015 08:17:26 GMT; domain=.miaojilicai.com; path=/";
~~~
##常用函數
~~~
<script language=javascript>
//獲得coolie 的值
function cookie(name){
var cookieArray=document.cookie.split("; "); //得到分割的cookie名值對
var cookie=new Object();
for (var i=0;i<cookieArray.length;i++){
var arr=cookieArray[i].split("="); //將名和值分開
if(arr[0]==name)return unescape(arr[1]); //如果是指定的cookie，則返回它的值
}
return "";
}
function delCookie(name)//刪除cookie
{
document.cookie = name+"=;expires="+(new Date(0)).toGMTString();
}
function getCookie(objName){//獲取指定名稱的cookie的值
var arrStr = document.cookie.split("; ");
for(var i = 0;i < arrStr.length;i ++){
var temp = arrStr[i].split("=");
if(temp[0] == objName) return unescape(temp[1]);
}
}
function addCookie(objName,objValue,objHours){ //添加cookie
var str = objName + "=" + escape(objValue);
if(objHours > 0){ //為時不設定過期時間，瀏覽器關閉時cookie自動消失
var date = new Date();
var ms = objHours*3600*1000;
date.setTime(date.getTime() + ms);
str += "; expires=" + date.toGMTString();
}
document.cookie = str;
}
function SetCookie(name,value)//兩個參數，一個是cookie的名子，一個是值
{
var Days = 30; //此 cookie 將被保存 30 天
var exp = new Date(); //new Date("December 31, 9998");
exp.setTime(exp.getTime() + Days*24*60*60*1000);
document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
function getCookie(name)//取cookies函數
{
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
if(arr != null) return unescape(arr[2]); return null;
}
function delCookie(name)//刪除cookie
{
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval=getCookie(name);
if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}
</script>
~~~
