javascript - 按名称读取 javascript cookie

Question

我已经使用设置了 cookie

document.cookie = 
    'MYBIGCOOKIE=' + value + 
    '; expires=' + now.toGMTString() + 
    '; path=/';

现在该网站上设置了 5 到 10 个 cookie，有没有办法通过名称检查此 cookie 的值。

if (document.cookie.MYBIGCOOKIE == '1') {
    alert('it is 1')
}

Answer 1

使用 RegExp 构造函数和多个替换来阐明语法:

function getCook(cookiename) 
  {
  // Get name followed by anything except a semicolon
  var cookiestring=RegExp(cookiename+"=[^;]+").exec(document.cookie);
  // Return everything after the equal sign, or an empty string if the cookie name not found
  return decodeURIComponent(!!cookiestring ? cookiestring.toString().replace(/^[^=]+./,"") : "");
  }

//Sample usage
var cookieValue = getCook('MYBIGCOOKIE');