Question

我使用docCookies对象在this应用程序上设置Cookie。

我正在测试的功能就是这个：

displayWelcomeMessage = function(idElement){
    var cookieName = 'username';

    alert(docCookies.getItem(cookieName)); // NULL when cookie not set

    var defaultName = "SweetAnon",
        daysToExpire = 1,
        username = docCookies.getItem(cookieName);

    // Check if cookie was already set (user "logged")
    if (username != null && username.trim() != "") {
        displayUsername(idElement, username);
    } else {
        username = prompt("If you enter your name\nI'll try to remember you :)");
        if (username != null && username.trim() != "") {
            docCookies.setItem(cookieName, username, daysToExpire);
            displayUsername(idElement, username);
        } else {
            displayUsername(idElement, defaultName);
        }
    }
    alert(docCookies.getItem(cookieName)); // Username or 'SweetAnon'
};

这是两个警报，它们在Firefox v28和Chromium v33.0.1750.152之间打印出不同的结果。如果我将foobar作为username输入，我会得到以下结果：

Firefox打印null然后foobar。
Chromium打印null然后再打null。

我认为Firefox的行为是正确的。但是我应该怎样做才能使它在Chromium上运行？

Answer 1

解决方案是将cookie值分配给对象而不是变量：

displayWelcomeMessage = function(idElement)
  {
  var cookieName = 'username',
      defaultName = "SweetAnon",
      daysToExpire = 1;

  /* assign username as a property of the current function */

  this.username = docCookies.getItem(cookieName);

  alert(docCookies.getItem(cookieName)); // NULL when cookie not set

  // Check if cookie was already set (user "logged")

  if (this.username != null && this.username.trim() != "")
      {
      displayUsername(idElement, this.username);
      } 

    else 
      {
      this.username = prompt("If you enter your name\nI'll try to remember you :)");

      if (this.username != null && this.username.trim() != "") 
        {
        docCookies.setItem(cookieName, this.username, daysToExpire);
        displayUsername(idElement, username);
        } 
      else 
        {
        displayUsername(idElement, defaultName);
        }
      }

  alert(docCookies.getItem(cookieName)); // Username or 'SweetAnon'
  };

<强>参考

为什么Firefox和Chromium之间的cookie行为不同？

1 个答案: