js 或者java 实现清除所有Cookies内容的操作，如何实现，是所有的Cookies内容，谢谢

Question

如题所述

Answer 1

var cookies = document.cookie.split(";");
for (var i = 0; i < cookies.length; i++) {
var cookie = cookies[i];
var eqPos = cookie.indexOf("=");
var name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;
document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
}
if(cookies.length > 0)
{
for (var i = 0; i < cookies.length; i++) {
var cookie = cookies[i];
var eqPos = cookie.indexOf("=");
var name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;
var domain = location.host.substr(location.host.indexOf('.'));
document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/; domain=" + domain;
}
}
js实现追问

如上图，我要实现这样的清除的效果，通过代码，但我不知道为什么var cookies = document.cookie.split(";");取出来的null， 不同的浏览器我都试过了，