处理cookie的三个f辅助函数：writeCookie, readCookie, clearCookie

最新推荐文章于 2020-11-22 12:57:00 发布

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本文介绍了JavaScript中处理cookie的三个关键函数：writeCookie用于设置cookie，readCookie用于读取cookie，clearCookie用于删除cookie。通过示例代码详细解释了每个函数的工作原理和用法。

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function writeCookie(name, value, domain, days )
{ 
var expire = ""; //by default, there is no expiration so the cookie is temporary
var domain = "; domain=" + domain + "; path=/"; 
//specifying a number of days makes the cookie persistent
if(days) 
{ 
expire = new Date((new Date()).getTime() + days * 24 * 60 * 60 * 1000); 
expire = "; expires=" + expire.toGMTString(); 
} 
//set the cookie to the name, value, and expiration date
document.cookie = name + "=" + escape(value) + expire + domain; 
}


function readCookie(name){
//find the specified cookie and return its value
var searchName = name + "=";
var cookie = document.cookie.split(';');
for(var i = 0 ; i < cookie.length; i++){
var c = cookie[i];
while(c.charAt(0) == ' ')
c = c.substring(1, c.length);
if(c.indexOf(searchName) == 0)
return c.substring(searchName.length, c.length);
}
return null;
}


function eraseCookie(name){
//erase the specified cookie
writeCookie(name,"",""-1);
}
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