ajax使用应该是有web容器的情况下使用，否则会报错，错误信息如下：
[color=orange]XMLHttpRequest cannot load http://localhost:8080/myproject/weather. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. [/color]
[color=orange]XMLHttpRequest cannot load http://localhost:8080/myproject/weather. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. [/color]
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