为什么vue无法保存cookie

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用户登录成功后，使用cookie保存已登录的用户信息可是为什么保存不了？

function set(name, value, expires, path, domain, secure){
    let cookieText = encodeURIComponent(name) + "=" + encodeURIComponent(value)
    if (expires instanceof Date)
        cookieText += "; expires=" + expires.toGMTString()
    if (path) cookieText += "; path=" + path
    if (domain) cookieText += "; domain=" + domain
    if (secure) cookieText += "; secure"
    document.cookie = cookieText
    console.log('set cookieText:'+cookieText)
    console.log('set document.cookie:'+document.cookie)
}

输出：

set cookieText:user=admin; expires=Mon, 28 Aug 2017 15:17:19 GMT; path=/; domain=localhost cookieUtil.js?5a50:28

set document.cookie:csrftoken=khoZnfaftwfcmAEWudmRkdJFc2U0XuqjRnQiZN7f3LsCwE1gDPoDehXaP3RVyz; _ga=GA1.1.393569735.1485076588

希望有大佬帮我看一下，新手第一个demo，很是头疼，谢谢了