一个JS操作Cookie的代码Demo，备忘&备查。
<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.0 Transitional//EN”>
<HTML>
<HEAD>
<TITLE> Cookie Read & Write Demo</TITLE>
<SCRIPT LANGUAGE=“JavaScript”>
<!–
var flag;
if(document.cookie){
flag = readCookie(“flag”);
}else{
alert(“shit!”);
createCookie(“flag”,“true”,10);
}
function test()
{
if(flag){
flag=false;
alert(“yes”);
eraseCookie(“flag”);
createCookie(“flag”,flag,10);
}else{
flag=true;
alert(“no”);
eraseCookie(“flag”);
createCookie(“flag”,flag,10);
}
}
function createCookie(name,value,days) {
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=/”;
}
function readCookie(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;
}
function eraseCookie(name) {
createCookie(name,“”,-1);
}
function alertCookie(name){
alert(readCookie(name));
}
//–>
</SCRIPT>
</HEAD>
<BODY>
<input type=button onclick=”alertCookie(‘flag’);“ value=“zz”>
<input type=button onclick=”test();“ value=“setCookie”>
</BODY>
</HTML>
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