源码：

//====================================================
// 访问https://www.zhihu.com/得到pagecode
// 2017年11月6日
//====================================================

// 内置https模块，提供了https服务器和客户端功能
var https=require("https");

// cheerio模块，提供了类似jQuery的功能
var cheerio = require("cheerio");

// 内置文件处理模块
var fs=require('fs');

// 请求参数JSON
var options;

// request请求
var req;

//--------------------------------------
// 程序入口
//--------------------------------------
function start(){
    // 初始化options
    options={
        hostname:'www.zhihu.com',
            port:443,
            path:'/',// 子路径
          method:'GET',
           agent:false,
    };

    req=https.request(options,function(resp){
        resp.setEncoding('utf8');
        var body="";

        resp.on('data',function(chunk){
            body+=chunk;
        });

        resp.on('end',function(){
            var $ = cheerio.load(body);
            console.log(body);

        });
    });

    // 超时处理
    req.setTimeout(5000,function(){
        req.abort();
    });

    // 出错处理
    req.on('error',function(err){
        if(err.code=="ECONNRESET"){
            console.log('socket端口连接超时。');
        }else{
            console.log('请求发生错误，err.code:'+err.code);
        }
    });

    // 请求结束
    req.end();
}

// 调用start函数，程序开始
start();

得到的body数据：

<!DOCTYPE html>
<html lang="zh-CN" class="">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<meta http-equiv="X-ZA-Response-Id" content="110f3b166e9849aa">
<meta http-equiv="X-ZA-Experiment" content="default:None,ge3:ge3_9,ge2:ge2_1,nweb_sticky_sidebar:sticky,live_review_buy_bar:live_review_buy_bar_2,is_office:false,home_ui2:default,is_show_unicom_free_entry:unicom_free_entry_off,app_store_rate_dialog:close,qa_sticky_sidebar:sticky_sidebar,android_profile_panel:panel_b,live_store:ls_a2_b2_c1_f2,search_hybrid_tabs:without-tabs,answer_related_readings:qa_recommend_with_ads_and_article,asdfadsf:asdfad,new_mobile_column_appheader:new_header,fav_act:default,remix_one_key_play_button:headerButton,mobile_qa_page_proxy_heifetz:m_qa_page_nweb,nweb_write_answer:default,android_pass_through_push:getui,new_more:new,new_buy_bar:livenewbuy3,zcm-lighting:zcm,iOS_newest_version:4.2.0,qrcode_login:qrcode,wechat_share_modal:wechat_share_modal_show">
<meta name="renderer" content="webkit" />
<meta name="description" content="中文互联网最大的知识平台，帮助人们便捷地分享彼此的知识、经验和见解。"/>
<meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1.0, maximum-scale=1.0"/>
<title>知乎 - 发现更大的世界</title>

<link rel="apple-touch-icon" href="https://static.zhihu.com/static/revved/img/ios/touch-icon-152.87c020b9.png" sizes="152x152">
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<link rel="dns-prefetch" href="comet.zhihu.com"/>
<link rel="dns-prefetch" href="static.zhihu.com"/>
<link rel="dns-prefetch" href="upload.zhihu.com"/>
<link rel="stylesheet" href="https://static.zhihu.com/static/revved/-/css/pages/unlogin-index/main.f214513a.css">
<meta name="google-site-verification" content="FTeR0c8arOPKh8c5DYh_9uu98_zJbaWw53J-Sch9MTg" />
<meta name="baidu-site-verification" content="KPFppAFoYF4Kkdv9" />
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<meta id="znonce" name="znonce" content="7b6bfcce1dba4927bc2fde931b3037fd">
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<script src="https://static.zhihu.com/static/components/respond/dest/respond.min.js"></script>
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<script src="/static/components/respond/cross-domain/respond.proxy.js"></script>
<![endif]-->
<script src="https://static.zhihu.com/static/revved/-/js/instant.14757a4a.js"></script>
</head>
<body class="zhi ">

<div class="index-main">
<div class="index-main-body">
<div class="index-header">
<h1 class="logo hide-text">知乎</h1>

<h2 class="subtitle">与世界分享你的知识、经验和见解</h2>

</div>

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<div class="qrcode-signin-failure-icon"></div>
<p class="qrcode-signin-failure-message"></p>
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<form class="zu-side-login-box" action="/register/email" id="sign-form-1" autocomplete="off" method="POST">
<input type="password" hidden>
<input type="hidden" name="_xsrf" value="c8581655229e04f445154e91134bc9c7"/>

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<input required type="text" name="fullname" aria-label="姓名" placeholder="姓名">
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