nodejs下request模塊爬取頁面中文字符gb2312亂碼問題

正常獲取頁面：

1 var request = require('request');
2 request(url, function(error, response, body) {
3     if (!error && response.statusCode == 200) {
4         console.log(body);
5     }
6 });

如果該頁面編碼是gb2312就會亂碼，需要進行轉碼：

var request = require('request');
var Iconv = require('iconv-lite');
request({encoding: null, url: url}, function(error, response, body) {
    if (!error && response.statusCode == 200) {
        console.log(Iconv.decode(body, 'gb2312').toString());
    }
});