node.js如何获取本机服务器的local ip
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 function getIPAdress(){  
    var interfaces = require('os').networkInterfaces();  
    for(var devName in interfaces){  
          var iface = interfaces[devName];  
          for(var i=0;i<iface.length;i++){  
               var alias = iface[i];  
               if(alias.family === 'IPv4' && alias.address !== '127.0.0.1' && !alias.internal){  
                     return alias.address;  
               }  
          }  
    }  
} 
console.log(getIPAdress());