检查Cookie是否存在，否则设置Cookie以在10天后过期 [英] Check if cookie exists else set cookie to Expire in 10 days

问题描述

这里是我要查找的（伪代码）：

Here is what I'm looking to do (pseudo-code):

想象一下，在示例中的cookie的名称是visited 。

Imagine the name of the cookie in the example is "visited" and it contains nothing.

if visited exists
then alert("hello again");
else
create visited - should expire in 10 days;
alert("This is your first time!")

JavaScript

How can I achieve this in JavaScript?

推荐答案

您需要读写 document.cookie / p>

You need to read and write document.cookie

if (document.cookie.indexOf("visited") >= 0) {
  // They've been here before.
  alert("hello again");
}
else {
  // set a new cookie
  expiry = new Date();
  expiry.setTime(expiry.getTime()+(10*60*1000)); // Ten minutes

  // Date()'s toGMTSting() method will format the date correctly for a cookie
  document.cookie = "visited=yes; expires=" + expiry.toGMTString();
  alert("this is your first time");
}

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