今天復制了一下w3schools的一個ajax的例子，看着不錯，復制到本地調試跟蹤調試下。用的firefox，然后一直出現問題：調試器未激活 的錯誤，搜索問題解決辦法。最后查到的是建議換個瀏覽器，firefox調試ajax有問題。於是下載chrome試試，調試的時候，看到錯誤的提示：No 'Access-Control-Allow-Origin' header is present on the requested resource，原來是訪問域不一樣，所以不允許本地的訪問。ok，知道鳥，繼續下面的學習加實踐吧。
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