今天复制了一下w3schools的一个ajax的例子，看着不错，复制到本地调试跟踪调试下。用的firefox，然后一直出现问题：调试器未激活 的错误，搜索问题解决办法。最后查到的是建议换个浏览器，firefox调试ajax有问题。于是下载chrome试试，调试的时候，看到错误的提示：No 'Access-Control-Allow-Origin' header is present on the requested resource，原来是访问域不一样，所以不允许本地的访问。ok，知道鸟，继续下面的学习加实践吧。
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