Question

前台在JavaScript方法中怎样保存和提取Cookie

Answer 1

function readCookie()

{

var the_cookie = document.cookie;

var broken_cookie = the_cookie.split(":");

var the_name = broken_cookie[1];

var the_name = unescape(the_name);

alert("Your name is: " + the_name);

}

第1行很重要．当你的浏览器打开一个网页时，它调用任何和
该网页有关的cookie然后将其载入document.cookie属性．

读取cookie的技巧在于从中抽取出你需要的信息．注意在我们
所设置的cookie是这样的：wm_javascript=username:dave%
20thau．在该函数第1行之后的所有用于从该cookie中提取出
用户名（username）．

var broken_cookie = the_cookie.split(":");

将cookie在分号处分割成两部分．
var the_name = broken_cookie[1];

抓取分号后面的内容dave%20thau．
var the_name = unescape(the_name);
取消函数escape()的编码替换．在本例中重新用空格替换了%20．
alert("Your name is: " + the_name); 显示你的姓名．

这个例子使用的cookie只保存了很少的信息：用户名，cookie
最多可以保存多达4kb的信息。

追问

谢谢，提取我懂了，那怎么保存呢？

追答

function setCookie(name,value){
var Days = 30;
var exp = new Date();
exp.setTime(exp.getTime() + Days*24*60*60*1000);
document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}

function getCookie(name){
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
if(arr != null){
return unescape(arr[2]);
}else{
return "";
}
}

function delCookie(name){
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval=getCookie(name);
if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}

Answer 2

请参看一下
http://www.sucai.com/Tech/List2/18373.htm

Answer 3

var Cookies = function() {};
Cookies.setCookie = function(name, value, seconds) {
if (typeof (seconds) != 'undefined') {
var date = new Date();
date.setTime(date.getTime() + (seconds * 1000));
var expires = "; expires=" + date.toGMTString();
} else {
var expires = "";
}

document.cookie = name + "=" + value + expires + "; path=/";
}
Cookies.getCookie = function(name) {
name = name + "=";
var carray = document.cookie.split(';');

for ( var i = 0; i < carray.length; i++) {
var c = carray[i];
while (c.charAt(0) == ' ')
c = c.substring(1, c.length);
if (c.indexOf(name) == 0)
return c.substring(name.length, c.length);
}
return null;
}
Cookies.deleteCookie = function(name) {
this.setCookie(name, "", -1);
}

Answer 4

看的了
也可以去找教学光盘下载来看
自己学吧