document.cookie究竟如何工作？ [英] How exactly does document.cookie work?
问题描述
如果我让Chrome通过进入控制台并输入 document.cookie; 来显示我 document.cookie 说：
If I get Chrome to show me document.cookie by going into the console and typing document.cookie; it'll give me, say:
name = John; gender = male;
但是，如果我输入，说， document.cookie = 5; 所有它是添加 5; 到字符串的开始，所以我得到：
But then if I type in, say, document.cookie = 5; all it does is add 5; to the start of the string, so I get:
5; name = John; gender =男性;
如果我尝试 document.cookie = null; 那么它不甚至不做任何事情。
If I try document.cookie = null; then it doesn't even do anything.
这怎么可能？这是一个变量，不是吗？那么为什么这个赋值操作符的运行方式呢？它实际上只是一点句法糖，而不是一个真正的变量？如果是这样，糖覆盖了什么？
How can this be? It's a variable, isn't it? So why isn't the assignment operator working the way it should? Is it actually just a bit of syntactic sugar rather than a real variable? And if so, what precisely is the sugar covering up?
推荐答案
document.cookie 具有非常特殊行为。如你所见，分配给它添加了一个cookie（或更新）一个cookie（或多个cookie），而不是替换所有的cookie。这是非常不寻常的。
document.cookie has very special behavior. As you've seen, assigning to it adds (or updates) a cookie (or multiple cookies), rather than replacing all of the cookies. It's very unusual.
阅读全文：
- MDN
- MSDN
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