function
getCookie(
cookieName) {
var
allcookies =
document.
cookie;
var
cookiePos =
allcookies.
indexOf(
cookieName);
//索引的长度
if (
cookiePos != -
1) {
// 把cookie_pos放在值的开始,只要给值加1即可。
cookiePos +=
cookieName.
length +
1;
var
cookieEnd =
allcookies.
indexOf(
";",
cookiePos);
if (
cookieEnd == -
1) {
cookieEnd =
allcookies.
length;
}
var
value =
decodeURI(
allcookies.
substring(
cookiePos,
cookieEnd));
}
return
value;
}