nodejs 为什么我下载的图片是空的呢？

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var http = require('http');
var querystring = require('querystring');
var fs = require('fs');
var data = '{"uid":"502acbd07fc640768ac3621bfaa55be4","pageSize":10,"pageIndex":0}';

var moment = require('moment');
var shijian = moment().format('YYYYMMDD')  

console.log(shijian);
var options = {
     hostname: '016888.net',  
        port: 80, //端口号 https 默认端口 443，http 默认的端口号是 80  
        path: '/personProduct/getPersonProductByType.action',  
        method: 'POST',  
        headers: {'Connection': 'keep-alive','User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.86 Safari/537.36',
		'Content-Type': 'application/json;charset=UTF-8',
		'Accept': 'application/json, text/javascript',
		'Content-Length': 70}
};
var req=http.request(options,function(res){  
    res.setEncoding('utf-8');  
  
      var responseString = '';  
  
      res.on('data', function(data) {  
        responseString += data; 
      });  
  
      res.on('end', function() {  

		 var resultObject = JSON.parse(responseString);  
				for(var i=0;i < resultObject.data.rows.length;i++){  
					var r=resultObject.data.rows[i];
			   
						  for (var b = 0; b < r.pics.picList.length; b++) {
							  console.log(r.pics.picList[b]+'保存完成');
								fs.writeFile('./imgs/'+shijian+'_'+r.code+'_'+b+'.jpg',r.pics.picList[b],'binary', function (err) {
									   if (err) throw err;
									   
								   });							
						  }
			
				}
		});  
  
      req.on('error', function(e) {  
             console.log('-----error-------',e);  
    });  
});  
req.write(data);  
req.end();