javascript操作cookie

/*

name是cookie的名字，也就是服务器端cookie的键

value是你cookie里面存的值

days是你想要多少天后过期

*/

function ppkCreate(name,value,days) {//写入一个cookie,

if (days) {

var date = new Date();

date.setTime(date.getTime()+(days*24*60*60*1000));

var expires = "; expires="+date.toGMTString();

}

else var expires = "";

document.cookie = name+"="+value+expires+"; path=/";

}

/*

name输入cookie的键值读取出cookie的value

*/

function ppkRead(name) {

var nameEQ = name + "=";

var ca = document.cookie.split(';');

for(var i=0;i < ca.length;i++) {

var c = ca[i];

while (c.charAt(0)==' ') c = c.substring(1,c.length);

if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);

}

return null;

}

/*

name输入cookie的键值，是让cookie失效也就是过期

*/

function ppkErase(name){

ppkCreate(name,'',-1);

}

ppkCreate("come",new Date().getTime(),1);//设置一个cookie键为：come,值为当前时间，过期时间为１天

alert(ppkRead("come"));//取值

ppkErase("come");//过期

alert(ppkRead("come"));//取值