如何检查Cookie是否存在? [英] How do I check if a cookie exists?
本文介绍了如何检查Cookie是否存在?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
检查cookie是否存在的好方法是什么?
What's a good way to check if a cookie exist?
条件:
如果存在Cookie,则
cookie1=;cookie1=345534;
//or
cookie1=345534;cookie1=;
//or
cookie1=345534;
如果不存在Cookie,
cookie=;
//or
<blank>
推荐答案
您可以使用所需cookie的名称调用函数getCookie,然后检查其是否为null.
You can call the function getCookie with the name of the cookie you want, then check to see if it is = null.
function getCookie(name) {
var dc = document.cookie;
var prefix = name + "=";
var begin = dc.indexOf("; " + prefix);
if (begin == -1) {
begin = dc.indexOf(prefix);
if (begin != 0) return null;
}
else
{
begin += 2;
var end = document.cookie.indexOf(";", begin);
if (end == -1) {
end = dc.length;
}
}
// because unescape has been deprecated, replaced with decodeURI
//return unescape(dc.substring(begin + prefix.length, end));
return decodeURI(dc.substring(begin + prefix.length, end));
}
function doSomething() {
var myCookie = getCookie("MyCookie");
if (myCookie == null) {
// do cookie doesn't exist stuff;
}
else {
// do cookie exists stuff
}
}
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