cookie--实现验证首次登录

function onelogin() {
var newVisitor = isNewVisitor(); // 如果是新访客
if(newVisitor === true) {
// 动画弹出消息框
parent.layer.open({
time: 2000,
shadeClose: false, //点击遮罩关闭
content: "首次登录，赠送10积分！",
end: function() {
window.location.href = "index.html";
}
});
// 标记：已经向该访客弹出过消息。30天之内不要再弹
setCookie("gznotes-visited", "true", 1);
} else {
window.location.href = "index.html";
}

}

function isNewVisitor() {
// 从cookie读取“已经向访客提示过消息”的标志位
var flg = getCookie("gznotes-visited");
if(flg === "") {
return true;
} else {
return false;
}
}
// 写字段到cookie
function setCookie(cname, cvalue, exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
var expires = "expires=" + d.toUTCString();
document.cookie = cname + "=" + cvalue + "; " + expires + ";path=/";
}
// 读cookie
function getCookie(cname) {
var name = cname + "=";
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);
if(c.indexOf(name) == 0) return c.substring(name.length, c.length);
}
return "";
}