http://localhost:8080/?deviceID=sub
获取deviceID的值;
var deviceID="<%=request.getParameter("deviceID")%>";
`<context-param>
<param-name>lx_api_url</param-name>
<param-value>http://localhost:8080/</param-value>
</context-param>`
获取web.xml中lx_api_url的值;
var url="<%=application.getInitParameter("lx_api_url")%>";