js获取cookie 删除cookie 设置cookie方法 这里提供一个写法！根据自己需求写符合自己的..
/*
*获取cookie
*/
function getCookieVal(offset) {
var endstr = document.cookie.indexOf(";", offset);
if(endstr == -1) {
endstr = document.cookie.length;
}
return document.cookie.substring(offset, endstr);
}
/*
*获取cookie
*/
function getCookie(name) {
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
var j = 0;
while(i < clen) {
j = i + alen;
if(document.cookie.substring(i, j) == arg){
return getCookieVal(j);
}
i = document.cookie.indexOf(" ", i) + 1;
if(i === 0){
break;
}
}
return '';
}
/*
*删除cookie
*/
function deleteCookie(name) {
var exp = new Date();
var cval = getCookie(name);
exp.setTime(exp.getTime() - 1);
document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}
/*
*设置cookie
*/
function setCookie(name, value) {
var argv = setCookie.arguments;
var argc = setCookie.arguments.length;
var exp = (argc > 2) ? argv[2] : 90;
var path = (argc > 3) ? argv[3] : null;
var domain = (argc > 4) ? argv[4] : null;
var secure = (argc > 5) ? argv[5] : false;
var expires = new Date();
deleteCookie(name);
expires.setTime(expires.getTime() + (exp*24*60*60*1000));
document.cookie = name + "=" + value +
"; expires=" + expires.toGMTString() +
((domain === null) ? "" : ("; domain=" + domain)) +
((path === null) ? "" : ("; path=" + path)) +
((secure === true) ? "; secure" : ";
}