讀寫Cookie的函數(shù)JS代碼怎么寫

2012/11/6 17:22:38作者：佚名來源：網(wǎng)絡(luò)

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【實(shí)例名稱】

【實(shí)例描述】

cookie是客戶端用來保存數(shù)據(jù)的對象，本例將所有有關(guān)Cookie的操作封裝成一個(gè)函數(shù)庫。讀者通過學(xué)習(xí)本例可以全面地掌握Cookie的使用。

【實(shí)例代碼】

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>標(biāo)題頁-學(xué)無憂（www.denvermotorcycleaccidentlawyer.com）</title>
<script Language="JavaScript">
//獲得Cookie解碼后的值
function GetCookieVal(offset)
{
var endstr = document.cookie.indexOf (";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
//設(shè)定Cookie值-將值保存在Cookie中
function SetCookie(name, value)
{
var expdate = new Date();                      
//獲取當(dāng)前日期
var argv = SetCookie.arguments;                
//獲取cookie的參數(shù)
var argc = SetCookie.arguments.length;         
//cookie的長度
var expires = (argc > 2) ? argv[2] : null;     
//cookie有效期
var path = (argc > 3) ? argv[3] : null;        
//cookie路徑
var domain = (argc > 4) ? argv[4] : null;      
//cookie所在的應(yīng)用程序域
var secure = (argc > 5) ? argv[5] : false;     
//cookie的加密安全設(shè)置
if(expires!=null) expdate.setTime(expdate.getTime()
 + ( expires * 1000 ));
document.cookie = name + "=" + escape (value)
 +((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))
+((path == null) ? "" : ("; path=" + path)) +
((domain == null) ? "" : ("; domain=" + domain))
+((secure == true) ? "; secure" : "");
}
//刪除指定的Cookie
function DelCookie(name)
{
var exp = new Date();
exp.setTime (exp.getTime() - 1);
var cval = GetCookie (name);
//獲取當(dāng)前cookie的值
document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString(); 
//將日期設(shè)置為過期時(shí)間
}
//獲得Cookie的值-name用來搜索Cookie的名字
function GetCookie(name)
{
var arg = name + "=";
var argLen= arg.length;                  
//指定Cookie名的長度
var cookieLen= document.cookie.length;   
//獲取cookie的長度
var i = 0;
while (i < cookieLen)
{
    var j = i + argLen;
    if (document.cookie.substring(i, j) == arg)
//依次查找對應(yīng)cookie名的值
    return GetCookieVal (j);
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break;
}
return null;
}
</script>
</head>
<body>
<input type=text name="txt1" value="搜索引擎是百度">
<input type=button value="保存Cookie" 
onClick="javascript:SetCookie('sousuo', txt1.value)">
<input type=button value="獲取Cookie" 
onClick=" javascript:alert(GetCookie('sousuo'))">
</body>
</html>
【運(yùn)行效果】

讀寫Cookie的函數(shù)運(yùn)行效果