对于gb2312编码的网页，直接用request去获取会得到乱码的结果，解决方法很简单：

1. npm install iconv-lite

2. var iconv = require('iconv-lite');

3. 

request.get({    url : url ,    encoding : null //让body 直接是buffer}, response);

4. 

var response = function (err, response, body) {    //返回的body 直接就是buffer 了...    var buf =  iconv.decode(body, 'gb2312');    ...    ...}

done.