Cookie 它是标准的客户端浏览器状态保存方式，可能在浏览器诞生不久就有Cookie了，为什么需要Cookie 这个东东？由于HTTP协议没有状态，所以需要一个标志/存储来记录客户浏览器当前的状态，
function isIE() {
return !!document.all;
}
function initUserData() {
if (isIE()) document.documentElement.addBehavior("#default#userdata");
}
function saveUserData(key,value) {
var ex;
if (isIE()) {
//IE
with (document.documentElement) try {
load(key);
setAttribute("value",value);
save(key);
return getAttribute("value");
} catch (ex) {
alert(ex.message)
}
} else if (window.sessionStorage) {
//FF 2.0+
try {
sessionStorage.setItem(key,value)
} catch (ex) {
alert(ex);
}
} else {
alert("Error occured in user data saving. your browser do not support user data.");
}
}
function loadUserData(key) {
var ex;
if (isIE()) {
//IE
with (document.documentElement) try {
load(key);
return getAttribute("value");
} catch (ex) {
alert(ex.message); return null;
}
} else if (window.sessionStorage) {
//FF 2.0+
try {
return sessionStorage.getItem(key)
} catch (ex) {
alert(ex)
}
} else {
alert("Error occured in user data loading. your browser do not support user data.")
}
}
function deleteUserData(key) {
var ex;
if (isIE()) {
//IE
with (document.documentElement) try {
load(key);
expires = new Date(315532799000).toUTCString();
save(key);
}
catch (ex) {
alert(ex.message);
}
} else if (window.sessionStorage) {
//FF 2.0+
try {
sessionStorage.removeItem(key)
} catch (ex) {
alert(ex)
}
} else {
alert("Error occured in user data deleting. your browser do not support user data.")
}
}
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