在js上获得cookie中指定的值

获得cookie中的"loginName"的值
var allcookies = document.cookie;
var arrStr = allcookies.split("; ");
var loginName = "";
for(var i = 0;i < arrStr.length;i ++){
var temp = arrStr[i].split("=");
if(temp[0] == "loginName") {

loginName = unescape(temp[1]);
break;
}
}