cookie，容量4kb，默認各種瀏覽器都支持，缺陷就是每次請求，瀏覽器都會把本機存的cookies發送到服務器，無形中浪費帶寬。
userdata，只有ie支持，單個容量64kb，每個域名最多可存10個共計640k數據。默認保存在C:\Documents and Settings\Administrator\UserData\目錄下，保存格式為xml。關于userdata更多資料參考
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/behaviors/reference/behaviors/userdata.aspsessionStorage，只有firefox2支持的臨時數據保存，容量大小不祥。
以下是js片段，拿來替代cookies還是蠻爽滴，HOHO。
?1?if(window.ActiveXObject)?{document.documentElement.addBehavior("#default#userdata");};
?2?
?3???var?Cache?＝?{
?4?????set?:?function(key,?value)?{
?5???????if(window.ActiveXObject)?{//for?ie5.0+
?6?????????with(document.documentElement){
?7???????????try{
?8?????????????load(key);
?9?????????????setAttribute("js",?value);
10?????????????save(key);
11???????????}catch?(ex){
12?????????????setAttribute("js",?value);
13?????????????save(key);
14???????????};
15?????????};
16???????}else?if(window.sessionStorage)?{//for?firefox2.0+
17?????????sessionStorage.setItem(key,?value);
18???????};
19?????},
20?????get?:?function(key)?{
21???????if(window.ActiveXObject)?{
22?????????with(document.documentElement){
23???????????try{
24?????????????load(key);
25?????????????return?getAttribute("js");
26???????????}catch?(ex){
27?????????????return?null;
28???????????};
29?????????};
30???????}else?if(window.sessionStorage)?{
31?????????return?sessionStorage.getItem(key);
32???????}else{
33?????????return?null;
34???????};
35?????},
36?????remove?:?function(key)?{
37???????if(window.ActiveXObject)?{
38?????????with(document.documentElement){
39???????????try{
40?????????????load(key);
41?????????????expires?=?new?Date(315532799000).toUTCString();
42?????????????save(key);
43???????????}catch?(ex){};
44?????????};
45???????}else?if(window.sessionStorage)?{
46?????????sessionStorage.removeItem(key);
47???????};
48?????}
49???} |
感謝emu的說明
http://www.aygfsteel.com/emu/archive/2006/10/04/73385.html