记录结果时，全局变量未在Nodej上更新

Question

我正在使用requsts包从另一台服务器调用api。但是函数外部的全局变量没有得到更新并显示未定义。

var request = require('request');
var contractAddress;
var abi;

request('http://expressanthem:9000/getcontractAddress',function(error,response,body){
    contractAddress=body;
    console.log(contractAddress+" "+"contract address at first");
});

request('http://expressanthem:9000/getcontractAbi',function(error,response,body1){
    // contract=body1;
    // console.log(typeof contract);
    abi=body1;
    console.log(abi+" "+"This is the abi at first");
}); 
console.log("The contractAddress is"+" "+contractAddress);
console.log("The cotractABI is"+" "+abi);

module.exports={
   contractAddress,
   abi
};

全局变量ABI和合约地址未定义值。