获取的数据是乱码，是怎么回事？
谁能帮我看看我的代码，帮我看看，我是个初学者，弄了好久，还是没弄出来，哪里出错了啊？获取到的数据不论是写到文件，还是读出来都是乱码，就这个样
var http = require('http');
var querystring = require('querystring');
var Promise = require('Promise'); // 若版本过低，可使用bluebird替换
var cheerio = require('cheerio'); // 类似于jQuery，安装方法：npm install cheerio
var fs = require('fs');
var path = require('path');
var option={
hostname: "user.pospal.cn",
port: 80,
path:"/Product/Manage",
method: "POST",
headers:{
"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
"Accept-Encoding": "gzip, deflate, sdch",
"Accept-Language": "zh-CN,zh;q=0.8",
"Cache-Control": "max-age=0",
"Connection": "keep-alive",
"Cookie": "__ngDebug=true; Vid=V2FQZl1mXj5QNQE6WWU=; .POSPALAUTH30220=0102A061942D6F" +
"84D308FEA0E15C7F6F8FD3080006350030003100350032003A0000012F00FFA5D1EE8E7CAB31C99" +
"86D05F03CCD1198462091BE; Hm_lvt_7d46a3151782b7a795ffeba367b5387d=1462767802,146" +
"2771728; Hm_lpvt_7d46a3151782b7a795ffeba367b5387d=1464480933; Hm_lvt_18c160bec8" +
"a91b8858c74ff702e6c788=1463498456,1463575485,1464061183,1464394742; Hm_lpvt_18c" +
"160bec8a91b8858c74ff702e6c788=1464513421; ASP.NET_SessionId=10ooianyuuk3mcjwbhqs3rls",
"Host":"user.pospal.cn",
"Referer": "http://user.pospal.cn/Product/CaseProductItem",
"Upgrade-Insecure-Requests": "1",
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36",
}
};
var req = http.request(option, function (res) {
res.setEncoding('utf8');
var data = '';
console.log("Status:" + res.statusCode);
console.log("headers:" + JSON.stringify(res.headers));
res.on('data', function (chunk) {
console.log("is Buffer: " + Buffer.isBuffer(chunk));
console.log(typeof chunk);
data += chunk;
console.log(chunk.toString());
});
res.on('end', function () {
console.log("shuju" + typeof data);
console.log("数据获取完毕！");
fs.writeFile(path.join(__dirname, 'account.js'), data, (err) => {
//fs.writeFile('account.js', data, (err) => {
if (err) throw err;
console.log('It\'s saved!');
});
filterHtml(data);
});
});
req.on('error', function (e) {
console.log("Error: " + e.message);
});
req.end();
