学习cookie的创建，和检查浏览器是否获取到了cookie，例子就是w3cschool上面的例子，只是在使用过程中发现，firefox获取到了cookie的值，但是，google却没有。于是，查了很多资料，发现很多人碰到了相同的问题，才知道，google在本地页面是不会保存cookie的，于是又添加了一段，显示cookie的值来验证，google是否保存本地页面的cookie这一说法。
<script type="text/javascript">
//设置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;
}
//获取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) != -1) return c.substring(name.length, c.length);
}
return "";
}
function allCookie(){//读取所有保存的cookie字符串
var str = document.cookie;
if (str == "") {
str = "没有保存任何cookie";
}
alert(str);
}
function checkCookie() {
var user = getCookie("username");
if (user != "") {
alert("Welcome again " + user);
} else {
user = prompt("Please enter your name:", "");
if (user != "" && user != null) {
setCookie("username", user, 365);
}
}
}
checkCookie();
</script>
<body > <input type="button" value="读取所有cookie" onclick="allCookie()"/> </body>
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