js bug: Origin 'null' is therefore not allowed access.

先说一下问题的由来，在本地html页面ajax请求本地或者局域网server的资源时遇到的bug，先来段出问题的代码：

<script type="text/javascript">$.ajax({type:"get",url:"http://192.168.199.59:9000/api/v1/questions/5825acefffa2f815acdb03cf",success:function(res){console.log(888);},error:function(){console.log(66666)}});
</script>

翻译一下大家的解释好了：
Origin null is not allowed by Access-Control-Allow-Origin 意味着你在尝试ajax请求本地文件，因为安全的原因，这是被禁止的。
服务端的做法是在response内允许这么做：

response.setHeader("Access-Control-Allow-Origin", "*")

如果Chrome浏览器的话可以尝试加入新的插件：
https://chrome.google.com/webstore/detail/allow-control-allow-origi/nlfbmbojpeacfghkpbjhddihlkkiljbi/related

来个参考文献
Chrome Origin null is not allowed by Access-Control-Allow-Origin

PS
有些朋友可能会发生这样的问题，你的get方法可以跨域但是post方法不行，然后在浏览器的console里面你会看到有我们很少用的option请求，这种问题最明确的问题就是你的服务端也许并有一个叫做option的路由，加一个就好了，例如：

OPTIONS          /*url                  controllers.Application.options(url: String)

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